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e8eb0d970a
gecko/memory/mozjemalloc/jemalloc.c
Justin Lebar e8eb0d970a Bug 903420 - Two fixes to jemalloc's memory reporters. r=glandium 
1) We were counting "dirty" pages in "waste", when we shouldn't have
   been.  This was causing the assertion at the end of jemalloc_stats()
   which checks that mapped memory is greater than committed memory to
   fail.

2) jemalloc_stats used stats_chunks.curchunks to measure the number of
   mapped pages.  This was problematic for two reasons.

   a) stats_chunks.curchunks was not locked when it was modified in
      chunk_{de}alloc(), so its value could be garbage.

   b) Even if it had been locked properly, it was possible for an
      allocation to occur during a call to jemalloc_stats which would
      cause the measured amount of allocated memory to exceed the
      measured amount of mapped memory, tripping the assertion we
      tripped in (1).

   We fixed these issues by deleting stats_chunks entirely, and by
   introducing huge_mapped, which measures the amount of memory mapped
   by huge allocations (and is properly protected by huge_mtx).

   We now measure the amount of mapped memory by adding huge_mapped and
   each arena's mapped memory, and we do this in such a way that even if
   an allocation occurs during our call to jemalloc_stats, we'll still
   get a consistent result (where mapped >= committed).
2013-08-15 11:15:04 -07:00

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/* -*- Mode: C; tab-width: 8; c-basic-offset: 8; indent-tabs-mode: t -*- */
/* vim:set softtabstop=8 shiftwidth=8 noet: */
/*-
* Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*******************************************************************************
*
* This allocator implementation is designed to provide scalable performance
* for multi-threaded programs on multi-processor systems. The following
* features are included for this purpose:
*
* + Multiple arenas are used if there are multiple CPUs, which reduces lock
* contention and cache sloshing.
*
* + Cache line sharing between arenas is avoided for internal data
* structures.
*
* + Memory is managed in chunks and runs (chunks can be split into runs),
* rather than as individual pages. This provides a constant-time
* mechanism for associating allocations with particular arenas.
*
* Allocation requests are rounded up to the nearest size class, and no record
* of the original request size is maintained. Allocations are broken into
* categories according to size class. Assuming runtime defaults, 4 kB pages
* and a 16 byte quantum on a 32-bit system, the size classes in each category
* are as follows:
*
* |=====================================|
* | Category | Subcategory | Size |
* |=====================================|
* | Small | Tiny | 2 |
* | | | 4 |
* | | | 8 |
* | |----------------+---------|
* | | Quantum-spaced | 16 |
* | | | 32 |
* | | | 48 |
* | | | ... |
* | | | 480 |
* | | | 496 |
* | | | 512 |
* | |----------------+---------|
* | | Sub-page | 1 kB |
* | | | 2 kB |
* |=====================================|
* | Large | 4 kB |
* | | 8 kB |
* | | 12 kB |
* | | ... |
* | | 1012 kB |
* | | 1016 kB |
* | | 1020 kB |
* |=====================================|
* | Huge | 1 MB |
* | | 2 MB |
* | | 3 MB |
* | | ... |
* |=====================================|
*
* NOTE: Due to Mozilla bug 691003, we cannot reserve less than one word for an
* allocation on Linux or Mac. So on 32-bit *nix, the smallest bucket size is
* 4 bytes, and on 64-bit, the smallest bucket size is 8 bytes.
*
* A different mechanism is used for each category:
*
* Small : Each size class is segregated into its own set of runs. Each run
* maintains a bitmap of which regions are free/allocated.
*
* Large : Each allocation is backed by a dedicated run. Metadata are stored
* in the associated arena chunk header maps.
*
* Huge : Each allocation is backed by a dedicated contiguous set of chunks.
* Metadata are stored in a separate red-black tree.
*
*******************************************************************************
*/
#ifdef MOZ_MEMORY_ANDROID
#define NO_TLS
#define _pthread_self() pthread_self()
#endif
/*
* On Linux, we use madvise(MADV_DONTNEED) to release memory back to the
* operating system. If we release 1MB of live pages with MADV_DONTNEED, our
* RSS will decrease by 1MB (almost) immediately.
*
* On Mac, we use madvise(MADV_FREE). Unlike MADV_DONTNEED on Linux, MADV_FREE
* on Mac doesn't cause the OS to release the specified pages immediately; the
* OS keeps them in our process until the machine comes under memory pressure.
*
* It's therefore difficult to measure the process's RSS on Mac, since, in the
* absence of memory pressure, the contribution from the heap to RSS will not
* decrease due to our madvise calls.
*
* We therefore define MALLOC_DOUBLE_PURGE on Mac. This causes jemalloc to
* track which pages have been MADV_FREE'd. You can then call
* jemalloc_purge_freed_pages(), which will force the OS to release those
* MADV_FREE'd pages, making the process's RSS reflect its true memory usage.
*
* The jemalloc_purge_freed_pages definition in memory/build/mozmemory.h needs
* to be adjusted if MALLOC_DOUBLE_PURGE is ever enabled on Linux.
*/
#ifdef MOZ_MEMORY_DARWIN
#define MALLOC_DOUBLE_PURGE
#endif
/*
* MALLOC_PRODUCTION disables assertions and statistics gathering. It also
* defaults the A and J runtime options to off. These settings are appropriate
* for production systems.
*/
#ifndef MOZ_MEMORY_DEBUG
# define MALLOC_PRODUCTION
#endif
/*
* Use only one arena by default. Mozilla does not currently make extensive
* use of concurrent allocation, so the increased fragmentation associated with
* multiple arenas is not warranted.
*/
#define MOZ_MEMORY_NARENAS_DEFAULT_ONE
/*
* Pass this set of options to jemalloc as its default. It does not override
* the options passed via the MALLOC_OPTIONS environment variable but is
* applied in addition to them.
*/
#ifdef MOZ_B2G
/* Reduce the amount of unused dirty pages to 1MiB on B2G */
# define MOZ_MALLOC_OPTIONS "ff"
#else
# define MOZ_MALLOC_OPTIONS ""
#endif
/*
* MALLOC_STATS enables statistics calculation, and is required for
* jemalloc_stats().
*/
#define MALLOC_STATS
#ifndef MALLOC_PRODUCTION
/*
* MALLOC_DEBUG enables assertions and other sanity checks, and disables
* inline functions.
*/
# define MALLOC_DEBUG
/* Memory filling (junk/zero). */
# define MALLOC_FILL
/* Allocation tracing. */
# ifndef MOZ_MEMORY_WINDOWS
# define MALLOC_UTRACE
# endif
/* Support optional abort() on OOM. */
# define MALLOC_XMALLOC
/* Support SYSV semantics. */
# define MALLOC_SYSV
#endif
/*
* MALLOC_VALIDATE causes malloc_usable_size() to perform some pointer
* validation. There are many possible errors that validation does not even
* attempt to detect.
*/
#define MALLOC_VALIDATE
/* Embed no-op macros that support memory allocation tracking via valgrind. */
#ifdef MOZ_VALGRIND
# define MALLOC_VALGRIND
#endif
#ifdef MALLOC_VALGRIND
# include <valgrind/valgrind.h>
#else
# define VALGRIND_MALLOCLIKE_BLOCK(addr, sizeB, rzB, is_zeroed)
# define VALGRIND_FREELIKE_BLOCK(addr, rzB)
#endif
/*
* MALLOC_BALANCE enables monitoring of arena lock contention and dynamically
* re-balances arena load if exponentially averaged contention exceeds a
* certain threshold.
*/
/* #define MALLOC_BALANCE */
/*
* MALLOC_PAGEFILE causes all mmap()ed memory to be backed by temporary
* files, so that if a chunk is mapped, it is guaranteed to be swappable.
* This avoids asynchronous OOM failures that are due to VM over-commit.
*/
/* #define MALLOC_PAGEFILE */
#ifdef MALLOC_PAGEFILE
/* Write size when initializing a page file. */
# define MALLOC_PAGEFILE_WRITE_SIZE 512
#endif
#if defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID)
#define _GNU_SOURCE /* For mremap(2). */
#define issetugid() 0
#if 0 /* Enable in order to test decommit code on Linux. */
# define MALLOC_DECOMMIT
#endif
#endif
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#ifdef MOZ_MEMORY_WINDOWS
/* Some defines from the CRT internal headers that we need here. */
#define _CRT_SPINCOUNT 5000
#define __crtInitCritSecAndSpinCount InitializeCriticalSectionAndSpinCount
#include <io.h>
#include <windows.h>
#pragma warning( disable: 4267 4996 4146 )
#define bool BOOL
#define false FALSE
#define true TRUE
#define inline __inline
#define SIZE_T_MAX SIZE_MAX
#define STDERR_FILENO 2
#define PATH_MAX MAX_PATH
#define vsnprintf _vsnprintf
#ifndef NO_TLS
static unsigned long tlsIndex = 0xffffffff;
#endif
#define __thread
#define _pthread_self() __threadid()
#define issetugid() 0
/* use MSVC intrinsics */
#pragma intrinsic(_BitScanForward)
static __forceinline int
ffs(int x)
{
unsigned long i;
if (_BitScanForward(&i, x) != 0)
return (i + 1);
return (0);
}
/* Implement getenv without using malloc */
static char mozillaMallocOptionsBuf[64];
#define getenv xgetenv
static char *
getenv(const char *name)
{
if (GetEnvironmentVariableA(name, (LPSTR)&mozillaMallocOptionsBuf,
sizeof(mozillaMallocOptionsBuf)) > 0)
return (mozillaMallocOptionsBuf);
return (NULL);
}
typedef unsigned char uint8_t;
typedef unsigned uint32_t;
typedef unsigned long long uint64_t;
typedef unsigned long long uintmax_t;
#if defined(MOZ_MEMORY_SIZEOF_PTR_2POW) && (MOZ_MEMORY_SIZEOF_PTR_2POW == 3)
typedef long long ssize_t;
#else
typedef long ssize_t;
#endif
#define MALLOC_DECOMMIT
#endif
#ifndef MOZ_MEMORY_WINDOWS
#ifndef MOZ_MEMORY_SOLARIS
#include <sys/cdefs.h>
#endif
#ifndef __DECONST
# define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
#endif
#ifndef MOZ_MEMORY
__FBSDID("$FreeBSD: head/lib/libc/stdlib/malloc.c 180599 2008-07-18 19:35:44Z jasone $");
#include "libc_private.h"
#ifdef MALLOC_DEBUG
# define _LOCK_DEBUG
#endif
#include "spinlock.h"
#include "namespace.h"
#endif
#include <sys/mman.h>
#ifndef MADV_FREE
# define MADV_FREE MADV_DONTNEED
#endif
#ifndef MAP_NOSYNC
# define MAP_NOSYNC 0
#endif
#include <sys/param.h>
#ifndef MOZ_MEMORY
#include <sys/stddef.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#if !defined(MOZ_MEMORY_SOLARIS) && !defined(MOZ_MEMORY_ANDROID)
#include <sys/sysctl.h>
#endif
#include <sys/uio.h>
#ifndef MOZ_MEMORY
#include <sys/ktrace.h> /* Must come after several other sys/ includes. */
#include <machine/atomic.h>
#include <machine/cpufunc.h>
#include <machine/vmparam.h>
#endif
#include <errno.h>
#include <limits.h>
#ifndef SIZE_T_MAX
# define SIZE_T_MAX SIZE_MAX
#endif
#include <pthread.h>
#ifdef MOZ_MEMORY_DARWIN
#define _pthread_self pthread_self
#define _pthread_mutex_init pthread_mutex_init
#define _pthread_mutex_trylock pthread_mutex_trylock
#define _pthread_mutex_lock pthread_mutex_lock
#define _pthread_mutex_unlock pthread_mutex_unlock
#endif
#include <sched.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifndef MOZ_MEMORY_DARWIN
#include <strings.h>
#endif
#include <unistd.h>
#ifdef MOZ_MEMORY_DARWIN
#include <libkern/OSAtomic.h>
#include <mach/mach_error.h>
#include <mach/mach_init.h>
#include <mach/vm_map.h>
#include <malloc/malloc.h>
#endif
#ifndef MOZ_MEMORY
#include "un-namespace.h"
#endif
#endif
#include "jemalloc_types.h"
#include "linkedlist.h"
#include "mozmemory_wrap.h"
/* Some tools, such as /dev/dsp wrappers, LD_PRELOAD libraries that
* happen to override mmap() and call dlsym() from their overridden
* mmap(). The problem is that dlsym() calls malloc(), and this ends
* up in a dead lock in jemalloc.
* On these systems, we prefer to directly use the system call.
* We do that for Linux systems and kfreebsd with GNU userland.
* Note sanity checks are not done (alignment of offset, ...) because
* the uses of mmap are pretty limited, in jemalloc.
*
* On Alpha, glibc has a bug that prevents syscall() to work for system
* calls with 6 arguments
*/
#if (defined(MOZ_MEMORY_LINUX) && !defined(__alpha__)) || \
(defined(MOZ_MEMORY_BSD) && defined(__GLIBC__))
#include <sys/syscall.h>
#if defined(SYS_mmap) || defined(SYS_mmap2)
static inline
void *_mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset)
{
/* S390 only passes one argument to the mmap system call, which is a
* pointer to a structure containing the arguments */
#ifdef __s390__
struct {
void *addr;
size_t length;
long prot;
long flags;
long fd;
off_t offset;
} args = { addr, length, prot, flags, fd, offset };
return (void *) syscall(SYS_mmap, &args);
#else
#ifdef SYS_mmap2
return (void *) syscall(SYS_mmap2, addr, length, prot, flags,
fd, offset >> 12);
#else
return (void *) syscall(SYS_mmap, addr, length, prot, flags,
fd, offset);
#endif
#endif
}
#define mmap _mmap
#define munmap(a, l) syscall(SYS_munmap, a, l)
#endif
#endif
#ifdef MOZ_MEMORY_DARWIN
static const bool isthreaded = true;
#endif
#if defined(MOZ_MEMORY_SOLARIS) && defined(MAP_ALIGN) && !defined(JEMALLOC_NEVER_USES_MAP_ALIGN)
#define JEMALLOC_USES_MAP_ALIGN /* Required on Solaris 10. Might improve performance elsewhere. */
#endif
#define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
#ifdef MOZ_MEMORY_WINDOWS
/* MSVC++ does not support C99 variable-length arrays. */
# define RB_NO_C99_VARARRAYS
#endif
#include "rb.h"
#ifdef MALLOC_DEBUG
/* Disable inlining to make debugging easier. */
#ifdef inline
#undef inline
#endif
# define inline
#endif
/* Size of stack-allocated buffer passed to strerror_r(). */
#define STRERROR_BUF 64
/* Minimum alignment of non-tiny allocations is 2^QUANTUM_2POW_MIN bytes. */
# define QUANTUM_2POW_MIN 4
#ifdef MOZ_MEMORY_SIZEOF_PTR_2POW
# define SIZEOF_PTR_2POW MOZ_MEMORY_SIZEOF_PTR_2POW
#else
# define SIZEOF_PTR_2POW 2
#endif
#define PIC
#ifndef MOZ_MEMORY_DARWIN
static const bool isthreaded = true;
#else
# define NO_TLS
#endif
#if 0
#ifdef __i386__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 2
# define CPU_SPINWAIT __asm__ volatile("pause")
#endif
#ifdef __ia64__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 3
#endif
#ifdef __alpha__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 3
# define NO_TLS
#endif
#ifdef __sparc64__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 3
# define NO_TLS
#endif
#ifdef __amd64__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 3
# define CPU_SPINWAIT __asm__ volatile("pause")
#endif
#ifdef __arm__
# define QUANTUM_2POW_MIN 3
# define SIZEOF_PTR_2POW 2
# define NO_TLS
#endif
#ifdef __mips__
# define QUANTUM_2POW_MIN 3
# define SIZEOF_PTR_2POW 2
# define NO_TLS
#endif
#ifdef __powerpc__
# define QUANTUM_2POW_MIN 4
# define SIZEOF_PTR_2POW 2
#endif
#endif
#define SIZEOF_PTR (1U << SIZEOF_PTR_2POW)
/* sizeof(int) == (1U << SIZEOF_INT_2POW). */
#ifndef SIZEOF_INT_2POW
# define SIZEOF_INT_2POW 2
#endif
/* We can't use TLS in non-PIC programs, since TLS relies on loader magic. */
#if (!defined(PIC) && !defined(NO_TLS))
# define NO_TLS
#endif
#ifdef NO_TLS
/* MALLOC_BALANCE requires TLS. */
# ifdef MALLOC_BALANCE
# undef MALLOC_BALANCE
# endif
#endif
/*
* Size and alignment of memory chunks that are allocated by the OS's virtual
* memory system.
*/
#define CHUNK_2POW_DEFAULT 20
/* Maximum number of dirty pages per arena. */
#define DIRTY_MAX_DEFAULT (1U << 10)
/*
* Maximum size of L1 cache line. This is used to avoid cache line aliasing,
* so over-estimates are okay (up to a point), but under-estimates will
* negatively affect performance.
*/
#define CACHELINE_2POW 6
#define CACHELINE ((size_t)(1U << CACHELINE_2POW))
/*
* Smallest size class to support. On Linux and Mac, even malloc(1) must
* reserve a word's worth of memory (see Mozilla bug 691003).
*/
#ifdef MOZ_MEMORY_WINDOWS
#define TINY_MIN_2POW 1
#else
#define TINY_MIN_2POW (sizeof(void*) == 8 ? 3 : 2)
#endif
/*
* Maximum size class that is a multiple of the quantum, but not (necessarily)
* a power of 2. Above this size, allocations are rounded up to the nearest
* power of 2.
*/
#define SMALL_MAX_2POW_DEFAULT 9
#define SMALL_MAX_DEFAULT (1U << SMALL_MAX_2POW_DEFAULT)
/*
* RUN_MAX_OVRHD indicates maximum desired run header overhead. Runs are sized
* as small as possible such that this setting is still honored, without
* violating other constraints. The goal is to make runs as small as possible
* without exceeding a per run external fragmentation threshold.
*
* We use binary fixed point math for overhead computations, where the binary
* point is implicitly RUN_BFP bits to the left.
*
* Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be
* honored for some/all object sizes, since there is one bit of header overhead
* per object (plus a constant). This constraint is relaxed (ignored) for runs
* that are so small that the per-region overhead is greater than:
*
* (RUN_MAX_OVRHD / (reg_size << (3+RUN_BFP))
*/
#define RUN_BFP 12
/* \/ Implicit binary fixed point. */
#define RUN_MAX_OVRHD 0x0000003dU
#define RUN_MAX_OVRHD_RELAX 0x00001800U
/* Put a cap on small object run size. This overrides RUN_MAX_OVRHD. */
#define RUN_MAX_SMALL_2POW 15
#define RUN_MAX_SMALL (1U << RUN_MAX_SMALL_2POW)
/*
* Hyper-threaded CPUs may need a special instruction inside spin loops in
* order to yield to another virtual CPU. If no such instruction is defined
* above, make CPU_SPINWAIT a no-op.
*/
#ifndef CPU_SPINWAIT
# define CPU_SPINWAIT
#endif
/*
* Adaptive spinning must eventually switch to blocking, in order to avoid the
* potential for priority inversion deadlock. Backing off past a certain point
* can actually waste time.
*/
#define SPIN_LIMIT_2POW 11
/*
* Conversion from spinning to blocking is expensive; we use (1U <<
* BLOCK_COST_2POW) to estimate how many more times costly blocking is than
* worst-case spinning.
*/
#define BLOCK_COST_2POW 4
#ifdef MALLOC_BALANCE
/*
* We use an exponential moving average to track recent lock contention,
* where the size of the history window is N, and alpha=2/(N+1).
*
* Due to integer math rounding, very small values here can cause
* substantial degradation in accuracy, thus making the moving average decay
* faster than it would with precise calculation.
*/
# define BALANCE_ALPHA_INV_2POW 9
/*
* Threshold value for the exponential moving contention average at which to
* re-assign a thread.
*/
# define BALANCE_THRESHOLD_DEFAULT (1U << (SPIN_LIMIT_2POW-4))
#endif
/******************************************************************************/
/* MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive. */
#if defined(MALLOC_DECOMMIT) && defined(MALLOC_DOUBLE_PURGE)
#error MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive.
#endif
/*
* Mutexes based on spinlocks. We can't use normal pthread spinlocks in all
* places, because they require malloc()ed memory, which causes bootstrapping
* issues in some cases.
*/
#if defined(MOZ_MEMORY_WINDOWS)
#define malloc_mutex_t CRITICAL_SECTION
#define malloc_spinlock_t CRITICAL_SECTION
#elif defined(MOZ_MEMORY_DARWIN)
typedef struct {
OSSpinLock lock;
} malloc_mutex_t;
typedef struct {
OSSpinLock lock;
} malloc_spinlock_t;
#elif defined(MOZ_MEMORY)
typedef pthread_mutex_t malloc_mutex_t;
typedef pthread_mutex_t malloc_spinlock_t;
#else
/* XXX these should #ifdef these for freebsd (and linux?) only */
typedef struct {
spinlock_t lock;
} malloc_mutex_t;
typedef malloc_spinlock_t malloc_mutex_t;
#endif
/* Set to true once the allocator has been initialized. */
static bool malloc_initialized = false;
#if defined(MOZ_MEMORY_WINDOWS)
/* No init lock for Windows. */
#elif defined(MOZ_MEMORY_DARWIN)
static malloc_mutex_t init_lock = {OS_SPINLOCK_INIT};
#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID)
static malloc_mutex_t init_lock = PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP;
#elif defined(MOZ_MEMORY)
static malloc_mutex_t init_lock = PTHREAD_MUTEX_INITIALIZER;
#else
static malloc_mutex_t init_lock = {_SPINLOCK_INITIALIZER};
#endif
/******************************************************************************/
/*
* Statistics data structures.
*/
#ifdef MALLOC_STATS
typedef struct malloc_bin_stats_s malloc_bin_stats_t;
struct malloc_bin_stats_s {
/*
* Number of allocation requests that corresponded to the size of this
* bin.
*/
uint64_t nrequests;
/* Total number of runs created for this bin's size class. */
uint64_t nruns;
/*
* Total number of runs reused by extracting them from the runs tree for
* this bin's size class.
*/
uint64_t reruns;
/* High-water mark for this bin. */
unsigned long highruns;
/* Current number of runs in this bin. */
unsigned long curruns;
};
typedef struct arena_stats_s arena_stats_t;
struct arena_stats_s {
/* Number of bytes currently mapped. */
size_t mapped;
/*
* Total number of purge sweeps, total number of madvise calls made,
* and total pages purged in order to keep dirty unused memory under
* control.
*/
uint64_t npurge;
uint64_t nmadvise;
uint64_t purged;
#ifdef MALLOC_DECOMMIT
/*
* Total number of decommit/commit operations, and total number of
* pages decommitted.
*/
uint64_t ndecommit;
uint64_t ncommit;
uint64_t decommitted;
#endif
/* Current number of committed pages. */
size_t committed;
/* Per-size-category statistics. */
size_t allocated_small;
uint64_t nmalloc_small;
uint64_t ndalloc_small;
size_t allocated_large;
uint64_t nmalloc_large;
uint64_t ndalloc_large;
#ifdef MALLOC_BALANCE
/* Number of times this arena reassigned a thread due to contention. */
uint64_t nbalance;
#endif
};
#endif /* #ifdef MALLOC_STATS */
/******************************************************************************/
/*
* Extent data structures.
*/
/* Tree of extents. */
typedef struct extent_node_s extent_node_t;
struct extent_node_s {
/* Linkage for the size/address-ordered tree. */
rb_node(extent_node_t) link_szad;
/* Linkage for the address-ordered tree. */
rb_node(extent_node_t) link_ad;
/* Pointer to the extent that this tree node is responsible for. */
void *addr;
/* Total region size. */
size_t size;
};
typedef rb_tree(extent_node_t) extent_tree_t;
/******************************************************************************/
/*
* Radix tree data structures.
*/
#ifdef MALLOC_VALIDATE
/*
* Size of each radix tree node (must be a power of 2). This impacts tree
* depth.
*/
# if (SIZEOF_PTR == 4)
# define MALLOC_RTREE_NODESIZE (1U << 14)
# else
# define MALLOC_RTREE_NODESIZE CACHELINE
# endif
typedef struct malloc_rtree_s malloc_rtree_t;
struct malloc_rtree_s {
malloc_spinlock_t lock;
void **root;
unsigned height;
unsigned level2bits[1]; /* Dynamically sized. */
};
#endif
/******************************************************************************/
/*
* Arena data structures.
*/
typedef struct arena_s arena_t;
typedef struct arena_bin_s arena_bin_t;
/* Each element of the chunk map corresponds to one page within the chunk. */
typedef struct arena_chunk_map_s arena_chunk_map_t;
struct arena_chunk_map_s {
/*
* Linkage for run trees. There are two disjoint uses:
*
* 1) arena_t's runs_avail tree.
* 2) arena_run_t conceptually uses this linkage for in-use non-full
* runs, rather than directly embedding linkage.
*/
rb_node(arena_chunk_map_t) link;
/*
* Run address (or size) and various flags are stored together. The bit
* layout looks like (assuming 32-bit system):
*
* ???????? ???????? ????---- -mckdzla
*
* ? : Unallocated: Run address for first/last pages, unset for internal
* pages.
* Small: Run address.
* Large: Run size for first page, unset for trailing pages.
* - : Unused.
* m : MADV_FREE/MADV_DONTNEED'ed?
* c : decommitted?
* k : key?
* d : dirty?
* z : zeroed?
* l : large?
* a : allocated?
*
* Following are example bit patterns for the three types of runs.
*
* r : run address
* s : run size
* x : don't care
* - : 0
* [cdzla] : bit set
*
* Unallocated:
* ssssssss ssssssss ssss---- --c-----
* xxxxxxxx xxxxxxxx xxxx---- ----d---
* ssssssss ssssssss ssss---- -----z--
*
* Small:
* rrrrrrrr rrrrrrrr rrrr---- -------a
* rrrrrrrr rrrrrrrr rrrr---- -------a
* rrrrrrrr rrrrrrrr rrrr---- -------a
*
* Large:
* ssssssss ssssssss ssss---- ------la
* -------- -------- -------- ------la
* -------- -------- -------- ------la
*/
size_t bits;
/* Note that CHUNK_MAP_DECOMMITTED's meaning varies depending on whether
* MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are defined.
*
* If MALLOC_DECOMMIT is defined, a page which is CHUNK_MAP_DECOMMITTED must be
* re-committed with pages_commit() before it may be touched. If
* MALLOC_DECOMMIT is defined, MALLOC_DOUBLE_PURGE may not be defined.
*
* If neither MALLOC_DECOMMIT nor MALLOC_DOUBLE_PURGE is defined, pages which
* are madvised (with either MADV_DONTNEED or MADV_FREE) are marked with
* CHUNK_MAP_MADVISED.
*
* Otherwise, if MALLOC_DECOMMIT is not defined and MALLOC_DOUBLE_PURGE is
* defined, then a page which is madvised is marked as CHUNK_MAP_MADVISED.
* When it's finally freed with jemalloc_purge_freed_pages, the page is marked
* as CHUNK_MAP_DECOMMITTED.
*/
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) || defined(MALLOC_DOUBLE_PURGE)
#define CHUNK_MAP_MADVISED ((size_t)0x40U)
#define CHUNK_MAP_DECOMMITTED ((size_t)0x20U)
#define CHUNK_MAP_MADVISED_OR_DECOMMITTED (CHUNK_MAP_MADVISED | CHUNK_MAP_DECOMMITTED)
#endif
#define CHUNK_MAP_KEY ((size_t)0x10U)
#define CHUNK_MAP_DIRTY ((size_t)0x08U)
#define CHUNK_MAP_ZEROED ((size_t)0x04U)
#define CHUNK_MAP_LARGE ((size_t)0x02U)
#define CHUNK_MAP_ALLOCATED ((size_t)0x01U)
};
typedef rb_tree(arena_chunk_map_t) arena_avail_tree_t;
typedef rb_tree(arena_chunk_map_t) arena_run_tree_t;
/* Arena chunk header. */
typedef struct arena_chunk_s arena_chunk_t;
struct arena_chunk_s {
/* Arena that owns the chunk. */
arena_t *arena;
/* Linkage for the arena's chunks_dirty tree. */
rb_node(arena_chunk_t) link_dirty;
#ifdef MALLOC_DOUBLE_PURGE
/* If we're double-purging, we maintain a linked list of chunks which
* have pages which have been madvise(MADV_FREE)'d but not explicitly
* purged.
*
* We're currently lazy and don't remove a chunk from this list when
* all its madvised pages are recommitted. */
LinkedList chunks_madvised_elem;
#endif
/* Number of dirty pages. */
size_t ndirty;
/* Map of pages within chunk that keeps track of free/large/small. */
arena_chunk_map_t map[1]; /* Dynamically sized. */
};
typedef rb_tree(arena_chunk_t) arena_chunk_tree_t;
typedef struct arena_run_s arena_run_t;
struct arena_run_s {
#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS)
uint32_t magic;
# define ARENA_RUN_MAGIC 0x384adf93
#endif
/* Bin this run is associated with. */
arena_bin_t *bin;
/* Index of first element that might have a free region. */
unsigned regs_minelm;
/* Number of free regions in run. */
unsigned nfree;
/* Bitmask of in-use regions (0: in use, 1: free). */
unsigned regs_mask[1]; /* Dynamically sized. */
};
struct arena_bin_s {
/*
* Current run being used to service allocations of this bin's size
* class.
*/
arena_run_t *runcur;
/*
* Tree of non-full runs. This tree is used when looking for an
* existing run when runcur is no longer usable. We choose the
* non-full run that is lowest in memory; this policy tends to keep
* objects packed well, and it can also help reduce the number of
* almost-empty chunks.
*/
arena_run_tree_t runs;
/* Size of regions in a run for this bin's size class. */
size_t reg_size;
/* Total size of a run for this bin's size class. */
size_t run_size;
/* Total number of regions in a run for this bin's size class. */
uint32_t nregs;
/* Number of elements in a run's regs_mask for this bin's size class. */
uint32_t regs_mask_nelms;
/* Offset of first region in a run for this bin's size class. */
uint32_t reg0_offset;
#ifdef MALLOC_STATS
/* Bin statistics. */
malloc_bin_stats_t stats;
#endif
};
struct arena_s {
#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS)
uint32_t magic;
# define ARENA_MAGIC 0x947d3d24
#endif
/* All operations on this arena require that lock be locked. */
#ifdef MOZ_MEMORY
malloc_spinlock_t lock;
#else
pthread_mutex_t lock;
#endif
#ifdef MALLOC_STATS
arena_stats_t stats;
#endif
/* Tree of dirty-page-containing chunks this arena manages. */
arena_chunk_tree_t chunks_dirty;
#ifdef MALLOC_DOUBLE_PURGE
/* Head of a linked list of MADV_FREE'd-page-containing chunks this
* arena manages. */
LinkedList chunks_madvised;
#endif
/*
* In order to avoid rapid chunk allocation/deallocation when an arena
* oscillates right on the cusp of needing a new chunk, cache the most
* recently freed chunk. The spare is left in the arena's chunk trees
* until it is deleted.
*
* There is one spare chunk per arena, rather than one spare total, in
* order to avoid interactions between multiple threads that could make
* a single spare inadequate.
*/
arena_chunk_t *spare;
/*
* Current count of pages within unused runs that are potentially
* dirty, and for which madvise(... MADV_FREE) has not been called. By
* tracking this, we can institute a limit on how much dirty unused
* memory is mapped for each arena.
*/
size_t ndirty;
/*
* Size/address-ordered tree of this arena's available runs. This tree
* is used for first-best-fit run allocation.
*/
arena_avail_tree_t runs_avail;
#ifdef MALLOC_BALANCE
/*
* The arena load balancing machinery needs to keep track of how much
* lock contention there is. This value is exponentially averaged.
*/
uint32_t contention;
#endif
/*
* bins is used to store rings of free regions of the following sizes,
* assuming a 16-byte quantum, 4kB pagesize, and default MALLOC_OPTIONS.
*
* bins[i] | size |
* --------+------+
* 0 | 2 |
* 1 | 4 |
* 2 | 8 |
* --------+------+
* 3 | 16 |
* 4 | 32 |
* 5 | 48 |
* 6 | 64 |
* : :
* : :
* 33 | 496 |
* 34 | 512 |
* --------+------+
* 35 | 1024 |
* 36 | 2048 |
* --------+------+
*/
arena_bin_t bins[1]; /* Dynamically sized. */
};
/******************************************************************************/
/*
* Data.
*/
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
/* Number of CPUs. */
static unsigned ncpus;
#endif
/*
* When MALLOC_STATIC_SIZES is defined most of the parameters
* controlling the malloc behavior are defined as compile-time constants
* for best performance and cannot be altered at runtime.
*/
#if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__)
#define MALLOC_STATIC_SIZES 1
#endif
#ifdef MALLOC_STATIC_SIZES
/*
* VM page size. It must divide the runtime CPU page size or the code
* will abort.
* Platform specific page size conditions copied from js/public/HeapAPI.h
*/
#if (defined(SOLARIS) || defined(__FreeBSD__)) && \
(defined(__sparc) || defined(__sparcv9) || defined(__ia64))
#define pagesize_2pow ((size_t) 13)
#elif defined(__powerpc64__)
#define pagesize_2pow ((size_t) 16)
#else
#define pagesize_2pow ((size_t) 12)
#endif
#define pagesize ((size_t) 1 << pagesize_2pow)
#define pagesize_mask (pagesize - 1)
/* Various quantum-related settings. */
#define QUANTUM_DEFAULT ((size_t) 1 << QUANTUM_2POW_MIN)
static const size_t quantum = QUANTUM_DEFAULT;
static const size_t quantum_mask = QUANTUM_DEFAULT - 1;
/* Various bin-related settings. */
static const size_t small_min = (QUANTUM_DEFAULT >> 1) + 1;
static const size_t small_max = (size_t) SMALL_MAX_DEFAULT;
/* Max size class for bins. */
static const size_t bin_maxclass = pagesize >> 1;
/* Number of (2^n)-spaced tiny bins. */
static const unsigned ntbins = (unsigned)
(QUANTUM_2POW_MIN - TINY_MIN_2POW);
/* Number of quantum-spaced bins. */
static const unsigned nqbins = (unsigned)
(SMALL_MAX_DEFAULT >> QUANTUM_2POW_MIN);
/* Number of (2^n)-spaced sub-page bins. */
static const unsigned nsbins = (unsigned)
(pagesize_2pow -
SMALL_MAX_2POW_DEFAULT - 1);
#else /* !MALLOC_STATIC_SIZES */
/* VM page size. */
static size_t pagesize;
static size_t pagesize_mask;
static size_t pagesize_2pow;
/* Various bin-related settings. */
static size_t bin_maxclass; /* Max size class for bins. */
static unsigned ntbins; /* Number of (2^n)-spaced tiny bins. */
static unsigned nqbins; /* Number of quantum-spaced bins. */
static unsigned nsbins; /* Number of (2^n)-spaced sub-page bins. */
static size_t small_min;
static size_t small_max;
/* Various quantum-related settings. */
static size_t quantum;
static size_t quantum_mask; /* (quantum - 1). */
#endif
/* Various chunk-related settings. */
/*
* Compute the header size such that it is large enough to contain the page map
* and enough nodes for the worst case: one node per non-header page plus one
* extra for situations where we briefly have one more node allocated than we
* will need.
*/
#define calculate_arena_header_size() \
(sizeof(arena_chunk_t) + sizeof(arena_chunk_map_t) * (chunk_npages - 1))
#define calculate_arena_header_pages() \
((calculate_arena_header_size() >> pagesize_2pow) + \
((calculate_arena_header_size() & pagesize_mask) ? 1 : 0))
/* Max size class for arenas. */
#define calculate_arena_maxclass() \
(chunksize - (arena_chunk_header_npages << pagesize_2pow))
#ifdef MALLOC_STATIC_SIZES
#define CHUNKSIZE_DEFAULT ((size_t) 1 << CHUNK_2POW_DEFAULT)
static const size_t chunksize = CHUNKSIZE_DEFAULT;
static const size_t chunksize_mask =CHUNKSIZE_DEFAULT - 1;
static const size_t chunk_npages = CHUNKSIZE_DEFAULT >> pagesize_2pow;
#define arena_chunk_header_npages calculate_arena_header_pages()
#define arena_maxclass calculate_arena_maxclass()
#else
static size_t chunksize;
static size_t chunksize_mask; /* (chunksize - 1). */
static size_t chunk_npages;
static size_t arena_chunk_header_npages;
static size_t arena_maxclass; /* Max size class for arenas. */
#endif
/********/
/*
* Chunks.
*/
#ifdef MALLOC_VALIDATE
static malloc_rtree_t *chunk_rtree;
#endif
/* Protects chunk-related data structures. */
static malloc_mutex_t huge_mtx;
/* Tree of chunks that are stand-alone huge allocations. */
static extent_tree_t huge;
#ifdef MALLOC_STATS
/* Huge allocation statistics. */
static uint64_t huge_nmalloc;
static uint64_t huge_ndalloc;
static size_t huge_allocated;
static size_t huge_mapped;
#endif
#ifdef MALLOC_PAGEFILE
static char pagefile_templ[PATH_MAX];
#endif
/****************************/
/*
* base (internal allocation).
*/
/*
* Current pages that are being used for internal memory allocations. These
* pages are carved up in cacheline-size quanta, so that there is no chance of
* false cache line sharing.
*/
static void *base_pages;
static void *base_next_addr;
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS)
static void *base_next_decommitted;
#endif
static void *base_past_addr; /* Addr immediately past base_pages. */
static extent_node_t *base_nodes;
static malloc_mutex_t base_mtx;
#ifdef MALLOC_STATS
static size_t base_mapped;
static size_t base_committed;
#endif
/********/
/*
* Arenas.
*/
/*
* Arenas that are used to service external requests. Not all elements of the
* arenas array are necessarily used; arenas are created lazily as needed.
*/
static arena_t **arenas;
static unsigned narenas;
#ifndef NO_TLS
# ifdef MALLOC_BALANCE
static unsigned narenas_2pow;
# else
static unsigned next_arena;
# endif
#endif
#ifdef MOZ_MEMORY
static malloc_spinlock_t arenas_lock; /* Protects arenas initialization. */
#else
static pthread_mutex_t arenas_lock; /* Protects arenas initialization. */
#endif
#ifndef NO_TLS
/*
* Map of pthread_self() --> arenas[???], used for selecting an arena to use
* for allocations.
*/
#ifndef MOZ_MEMORY_WINDOWS
static __thread arena_t *arenas_map;
#endif
#endif
/*******************************/
/*
* Runtime configuration options.
*/
MOZ_JEMALLOC_API
const char *_malloc_options = MOZ_MALLOC_OPTIONS;
#ifndef MALLOC_PRODUCTION
static bool opt_abort = true;
#ifdef MALLOC_FILL
static bool opt_junk = true;
#endif
#else
static bool opt_abort = false;
#ifdef MALLOC_FILL
static bool opt_junk = false;
#endif
#endif
static size_t opt_dirty_max = DIRTY_MAX_DEFAULT;
#ifdef MALLOC_BALANCE
static uint64_t opt_balance_threshold = BALANCE_THRESHOLD_DEFAULT;
#endif
static bool opt_print_stats = false;
#ifdef MALLOC_STATIC_SIZES
#define opt_quantum_2pow QUANTUM_2POW_MIN
#define opt_small_max_2pow SMALL_MAX_2POW_DEFAULT
#define opt_chunk_2pow CHUNK_2POW_DEFAULT
#else
static size_t opt_quantum_2pow = QUANTUM_2POW_MIN;
static size_t opt_small_max_2pow = SMALL_MAX_2POW_DEFAULT;
static size_t opt_chunk_2pow = CHUNK_2POW_DEFAULT;
#endif
#ifdef MALLOC_PAGEFILE
static bool opt_pagefile = false;
#endif
#ifdef MALLOC_UTRACE
static bool opt_utrace = false;
#endif
#ifdef MALLOC_SYSV
static bool opt_sysv = false;
#endif
#ifdef MALLOC_XMALLOC
static bool opt_xmalloc = false;
#endif
#ifdef MALLOC_FILL
static bool opt_zero = false;
#endif
static int opt_narenas_lshift = 0;
#ifdef MALLOC_UTRACE
typedef struct {
void *p;
size_t s;
void *r;
} malloc_utrace_t;
#define UTRACE(a, b, c) \
if (opt_utrace) { \
malloc_utrace_t ut; \
ut.p = (a); \
ut.s = (b); \
ut.r = (c); \
utrace(&ut, sizeof(ut)); \
}
#else
#define UTRACE(a, b, c)
#endif
/******************************************************************************/
/*
* Begin function prototypes for non-inline static functions.
*/
static char *umax2s(uintmax_t x, unsigned base, char *s);
static bool malloc_mutex_init(malloc_mutex_t *mutex);
static bool malloc_spin_init(malloc_spinlock_t *lock);
static void wrtmessage(const char *p1, const char *p2, const char *p3,
const char *p4);
#ifdef MALLOC_STATS
#ifdef MOZ_MEMORY_DARWIN
/* Avoid namespace collision with OS X's malloc APIs. */
#define malloc_printf moz_malloc_printf
#endif
static void malloc_printf(const char *format, ...);
#endif
static bool base_pages_alloc_mmap(size_t minsize);
static bool base_pages_alloc(size_t minsize);
static void *base_alloc(size_t size);
static void *base_calloc(size_t number, size_t size);
static extent_node_t *base_node_alloc(void);
static void base_node_dealloc(extent_node_t *node);
#ifdef MALLOC_STATS
static void stats_print(arena_t *arena);
#endif
static void *pages_map(void *addr, size_t size, int pfd);
static void pages_unmap(void *addr, size_t size);
static void *chunk_alloc_mmap(size_t size, bool pagefile);
#ifdef MALLOC_PAGEFILE
static int pagefile_init(size_t size);
static void pagefile_close(int pfd);
#endif
static void *chunk_alloc(size_t size, bool zero, bool pagefile);
static void chunk_dealloc_mmap(void *chunk, size_t size);
static void chunk_dealloc(void *chunk, size_t size);
#ifndef NO_TLS
static arena_t *choose_arena_hard(void);
#endif
static void arena_run_split(arena_t *arena, arena_run_t *run, size_t size,
bool large, bool zero);
static void arena_chunk_init(arena_t *arena, arena_chunk_t *chunk);
static void arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk);
static arena_run_t *arena_run_alloc(arena_t *arena, arena_bin_t *bin,
size_t size, bool large, bool zero);
static void arena_purge(arena_t *arena, bool all);
static void arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty);
static void arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, size_t oldsize, size_t newsize);
static void arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk,
arena_run_t *run, size_t oldsize, size_t newsize, bool dirty);
static arena_run_t *arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin);
static void *arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin);
static size_t arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size);
#ifdef MALLOC_BALANCE
static void arena_lock_balance_hard(arena_t *arena);
#endif
static void *arena_malloc_large(arena_t *arena, size_t size, bool zero);
static void *arena_palloc(arena_t *arena, size_t alignment, size_t size,
size_t alloc_size);
static size_t arena_salloc(const void *ptr);
static void arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk,
void *ptr);
static void arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk,
void *ptr, size_t size, size_t oldsize);
static bool arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk,
void *ptr, size_t size, size_t oldsize);
static bool arena_ralloc_large(void *ptr, size_t size, size_t oldsize);
static void *arena_ralloc(void *ptr, size_t size, size_t oldsize);
static bool arena_new(arena_t *arena);
static arena_t *arenas_extend(unsigned ind);
static void *huge_malloc(size_t size, bool zero);
static void *huge_palloc(size_t alignment, size_t size);
static void *huge_ralloc(void *ptr, size_t size, size_t oldsize);
static void huge_dalloc(void *ptr);
static void malloc_print_stats(void);
#ifndef MOZ_MEMORY_WINDOWS
static
#endif
bool malloc_init_hard(void);
static void _malloc_prefork(void);
static void _malloc_postfork(void);
#ifdef MOZ_MEMORY_DARWIN
/*
* MALLOC_ZONE_T_NOTE
*
* On Darwin, we hook into the memory allocator using a malloc_zone_t struct.
* We must be very careful around this struct because of different behaviour on
* different versions of OSX.
*
* Each of OSX 10.5, 10.6 and 10.7 use different versions of the struct
* (with version numbers 3, 6 and 8 respectively). The binary we use on each of
* these platforms will not necessarily be built using the correct SDK [1].
* This means we need to statically know the correct struct size to use on all
* OSX releases, and have a fallback for unknown future versions. The struct
* sizes defined in osx_zone_types.h.
*
* For OSX 10.8 and later, we may expect the malloc_zone_t struct to change
* again, and need to dynamically account for this. By simply leaving
* malloc_zone_t alone, we don't quite deal with the problem, because there
* remain calls to jemalloc through the mozalloc interface. We check this
* dynamically on each allocation, using the CHECK_DARWIN macro and
* osx_use_jemalloc.
*
*
* [1] Mozilla is built as a universal binary on Mac, supporting i386 and
* x86_64. The i386 target is built using the 10.5 SDK, even if it runs on
* 10.6. The x86_64 target is built using the 10.6 SDK, even if it runs on
* 10.7 or later, or 10.5.
*
* FIXME:
* When later versions of OSX come out (10.8 and up), we need to check their
* malloc_zone_t versions. If they're greater than 8, we need a new version
* of malloc_zone_t adapted into osx_zone_types.h.
*/
#ifndef MOZ_REPLACE_MALLOC
#include "osx_zone_types.h"
#define LEOPARD_MALLOC_ZONE_T_VERSION 3
#define SNOW_LEOPARD_MALLOC_ZONE_T_VERSION 6
#define LION_MALLOC_ZONE_T_VERSION 8
static bool osx_use_jemalloc = false;
static lion_malloc_zone l_szone;
static malloc_zone_t * szone = (malloc_zone_t*)(&l_szone);
static lion_malloc_introspection l_ozone_introspect;
static malloc_introspection_t * const ozone_introspect =
(malloc_introspection_t*)(&l_ozone_introspect);
static void szone2ozone(malloc_zone_t *zone, size_t size);
static size_t zone_version_size(int version);
#else
static const bool osx_use_jemalloc = true;
#endif
#endif
/*
* End function prototypes.
*/
/******************************************************************************/
/*
* umax2s() provides minimal integer printing functionality, which is
* especially useful for situations where allocation in vsnprintf() calls would
* potentially cause deadlock.
*/
#define UMAX2S_BUFSIZE 65
char *
umax2s(uintmax_t x, unsigned base, char *s)
{
unsigned i;
i = UMAX2S_BUFSIZE - 1;
s[i] = '\0';
switch (base) {
case 10:
do {
i--;
s[i] = "0123456789"[x % 10];
x /= 10;
} while (x > 0);
break;
case 16:
do {
i--;
s[i] = "0123456789abcdef"[x & 0xf];
x >>= 4;
} while (x > 0);
break;
default:
do {
i--;
s[i] = "0123456789abcdefghijklmnopqrstuvwxyz"[x % base];
x /= base;
} while (x > 0);
}
return (&s[i]);
}
static void
wrtmessage(const char *p1, const char *p2, const char *p3, const char *p4)
{
#if defined(MOZ_MEMORY) && !defined(MOZ_MEMORY_WINDOWS)
#define _write write
#endif
_write(STDERR_FILENO, p1, (unsigned int) strlen(p1));
_write(STDERR_FILENO, p2, (unsigned int) strlen(p2));
_write(STDERR_FILENO, p3, (unsigned int) strlen(p3));
_write(STDERR_FILENO, p4, (unsigned int) strlen(p4));
}
MOZ_JEMALLOC_API
void (*_malloc_message)(const char *p1, const char *p2, const char *p3,
const char *p4) = wrtmessage;
#ifdef MALLOC_DEBUG
# define assert(e) do { \
if (!(e)) { \
char line_buf[UMAX2S_BUFSIZE]; \
_malloc_message(__FILE__, ":", umax2s(__LINE__, 10, \
line_buf), ": Failed assertion: "); \
_malloc_message("\"", #e, "\"\n", ""); \
abort(); \
} \
} while (0)
#else
#define assert(e)
#endif
#include <mozilla/Assertions.h>
#include <mozilla/Attributes.h>
/* RELEASE_ASSERT calls jemalloc_crash() instead of calling MOZ_CRASH()
* directly because we want crashing to add a frame to the stack. This makes
* it easier to find the failing assertion in crash stacks. */
MOZ_NEVER_INLINE static void
jemalloc_crash()
{
MOZ_CRASH();
}
#if defined(MOZ_JEMALLOC_HARD_ASSERTS)
# define RELEASE_ASSERT(assertion) do { \
if (!(assertion)) { \
jemalloc_crash(); \
} \
} while (0)
#else
# define RELEASE_ASSERT(assertion) assert(assertion)
#endif
/******************************************************************************/
/*
* Begin mutex. We can't use normal pthread mutexes in all places, because
* they require malloc()ed memory, which causes bootstrapping issues in some
* cases.
*/
static bool
malloc_mutex_init(malloc_mutex_t *mutex)
{
#if defined(MOZ_MEMORY_WINDOWS)
if (isthreaded)
if (! __crtInitCritSecAndSpinCount(mutex, _CRT_SPINCOUNT))
return (true);
#elif defined(MOZ_MEMORY_DARWIN)
mutex->lock = OS_SPINLOCK_INIT;
#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID)
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0)
return (true);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
if (pthread_mutex_init(mutex, &attr) != 0) {
pthread_mutexattr_destroy(&attr);
return (true);
}
pthread_mutexattr_destroy(&attr);
#elif defined(MOZ_MEMORY)
if (pthread_mutex_init(mutex, NULL) != 0)
return (true);
#else
static const spinlock_t lock = _SPINLOCK_INITIALIZER;
mutex->lock = lock;
#endif
return (false);
}
static inline void
malloc_mutex_lock(malloc_mutex_t *mutex)
{
#if defined(MOZ_MEMORY_WINDOWS)
EnterCriticalSection(mutex);
#elif defined(MOZ_MEMORY_DARWIN)
OSSpinLockLock(&mutex->lock);
#elif defined(MOZ_MEMORY)
pthread_mutex_lock(mutex);
#else
if (isthreaded)
_SPINLOCK(&mutex->lock);
#endif
}
static inline void
malloc_mutex_unlock(malloc_mutex_t *mutex)
{
#if defined(MOZ_MEMORY_WINDOWS)
LeaveCriticalSection(mutex);
#elif defined(MOZ_MEMORY_DARWIN)
OSSpinLockUnlock(&mutex->lock);
#elif defined(MOZ_MEMORY)
pthread_mutex_unlock(mutex);
#else
if (isthreaded)
_SPINUNLOCK(&mutex->lock);
#endif
}
static bool
malloc_spin_init(malloc_spinlock_t *lock)
{
#if defined(MOZ_MEMORY_WINDOWS)
if (isthreaded)
if (! __crtInitCritSecAndSpinCount(lock, _CRT_SPINCOUNT))
return (true);
#elif defined(MOZ_MEMORY_DARWIN)
lock->lock = OS_SPINLOCK_INIT;
#elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID)
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0)
return (true);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
if (pthread_mutex_init(lock, &attr) != 0) {
pthread_mutexattr_destroy(&attr);
return (true);
}
pthread_mutexattr_destroy(&attr);
#elif defined(MOZ_MEMORY)
if (pthread_mutex_init(lock, NULL) != 0)
return (true);
#else
lock->lock = _SPINLOCK_INITIALIZER;
#endif
return (false);
}
static inline void
malloc_spin_lock(malloc_spinlock_t *lock)
{
#if defined(MOZ_MEMORY_WINDOWS)
EnterCriticalSection(lock);
#elif defined(MOZ_MEMORY_DARWIN)
OSSpinLockLock(&lock->lock);
#elif defined(MOZ_MEMORY)
pthread_mutex_lock(lock);
#else
if (isthreaded)
_SPINLOCK(&lock->lock);
#endif
}
static inline void
malloc_spin_unlock(malloc_spinlock_t *lock)
{
#if defined(MOZ_MEMORY_WINDOWS)
LeaveCriticalSection(lock);
#elif defined(MOZ_MEMORY_DARWIN)
OSSpinLockUnlock(&lock->lock);
#elif defined(MOZ_MEMORY)
pthread_mutex_unlock(lock);
#else
if (isthreaded)
_SPINUNLOCK(&lock->lock);
#endif
}
/*
* End mutex.
*/
/******************************************************************************/
/*
* Begin spin lock. Spin locks here are actually adaptive mutexes that block
* after a period of spinning, because unbounded spinning would allow for
* priority inversion.
*/
#if defined(MOZ_MEMORY) && !defined(MOZ_MEMORY_DARWIN)
# define malloc_spin_init malloc_mutex_init
# define malloc_spin_lock malloc_mutex_lock
# define malloc_spin_unlock malloc_mutex_unlock
#endif
#ifndef MOZ_MEMORY
/*
* We use an unpublished interface to initialize pthread mutexes with an
* allocation callback, in order to avoid infinite recursion.
*/
int _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
void *(calloc_cb)(size_t, size_t));
__weak_reference(_pthread_mutex_init_calloc_cb_stub,
_pthread_mutex_init_calloc_cb);
int
_pthread_mutex_init_calloc_cb_stub(pthread_mutex_t *mutex,
void *(calloc_cb)(size_t, size_t))
{
return (0);
}
static bool
malloc_spin_init(pthread_mutex_t *lock)
{
if (_pthread_mutex_init_calloc_cb(lock, base_calloc) != 0)
return (true);
return (false);
}
static inline unsigned
malloc_spin_lock(pthread_mutex_t *lock)
{
unsigned ret = 0;
if (isthreaded) {
if (_pthread_mutex_trylock(lock) != 0) {
unsigned i;
volatile unsigned j;
/* Exponentially back off. */
for (i = 1; i <= SPIN_LIMIT_2POW; i++) {
for (j = 0; j < (1U << i); j++)
ret++;
CPU_SPINWAIT;
if (_pthread_mutex_trylock(lock) == 0)
return (ret);
}
/*
* Spinning failed. Block until the lock becomes
* available, in order to avoid indefinite priority
* inversion.
*/
_pthread_mutex_lock(lock);
assert((ret << BLOCK_COST_2POW) != 0);
return (ret << BLOCK_COST_2POW);
}
}
return (ret);
}
static inline void
malloc_spin_unlock(pthread_mutex_t *lock)
{
if (isthreaded)
_pthread_mutex_unlock(lock);
}
#endif
/*
* End spin lock.
*/
/******************************************************************************/
/*
* Begin Utility functions/macros.
*/
/* Return the chunk address for allocation address a. */
#define CHUNK_ADDR2BASE(a) \
((void *)((uintptr_t)(a) & ~chunksize_mask))
/* Return the chunk offset of address a. */
#define CHUNK_ADDR2OFFSET(a) \
((size_t)((uintptr_t)(a) & chunksize_mask))
/* Return the smallest chunk multiple that is >= s. */
#define CHUNK_CEILING(s) \
(((s) + chunksize_mask) & ~chunksize_mask)
/* Return the smallest cacheline multiple that is >= s. */
#define CACHELINE_CEILING(s) \
(((s) + (CACHELINE - 1)) & ~(CACHELINE - 1))
/* Return the smallest quantum multiple that is >= a. */
#define QUANTUM_CEILING(a) \
(((a) + quantum_mask) & ~quantum_mask)
/* Return the smallest pagesize multiple that is >= s. */
#define PAGE_CEILING(s) \
(((s) + pagesize_mask) & ~pagesize_mask)
/* Compute the smallest power of 2 that is >= x. */
static inline size_t
pow2_ceil(size_t x)
{
x--;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
#if (SIZEOF_PTR == 8)
x |= x >> 32;
#endif
x++;
return (x);
}
#ifdef MALLOC_BALANCE
/*
* Use a simple linear congruential pseudo-random number generator:
*
* prn(y) = (a*x + c) % m
*
* where the following constants ensure maximal period:
*
* a == Odd number (relatively prime to 2^n), and (a-1) is a multiple of 4.
* c == Odd number (relatively prime to 2^n).
* m == 2^32
*
* See Knuth's TAOCP 3rd Ed., Vol. 2, pg. 17 for details on these constraints.
*
* This choice of m has the disadvantage that the quality of the bits is
* proportional to bit position. For example. the lowest bit has a cycle of 2,
* the next has a cycle of 4, etc. For this reason, we prefer to use the upper
* bits.
*/
# define PRN_DEFINE(suffix, var, a, c) \
static inline void \
sprn_##suffix(uint32_t seed) \
{ \
var = seed; \
} \
\
static inline uint32_t \
prn_##suffix(uint32_t lg_range) \
{ \
uint32_t ret, x; \
\
assert(lg_range > 0); \
assert(lg_range <= 32); \
\
x = (var * (a)) + (c); \
var = x; \
ret = x >> (32 - lg_range); \
\
return (ret); \
}
# define SPRN(suffix, seed) sprn_##suffix(seed)
# define PRN(suffix, lg_range) prn_##suffix(lg_range)
#endif
#ifdef MALLOC_BALANCE
/* Define the PRNG used for arena assignment. */
static __thread uint32_t balance_x;
PRN_DEFINE(balance, balance_x, 1297, 1301)
#endif
#ifdef MALLOC_UTRACE
static int
utrace(const void *addr, size_t len)
{
malloc_utrace_t *ut = (malloc_utrace_t *)addr;
char buf_a[UMAX2S_BUFSIZE];
char buf_b[UMAX2S_BUFSIZE];
assert(len == sizeof(malloc_utrace_t));
if (ut->p == NULL && ut->s == 0 && ut->r == NULL) {
_malloc_message(
umax2s(getpid(), 10, buf_a),
" x USER malloc_init()\n", "", "");
} else if (ut->p == NULL && ut->r != NULL) {
_malloc_message(
umax2s(getpid(), 10, buf_a),
" x USER 0x",
umax2s((uintptr_t)ut->r, 16, buf_b),
" = malloc(");
_malloc_message(
umax2s(ut->s, 10, buf_a),
")\n", "", "");
} else if (ut->p != NULL && ut->r != NULL) {
_malloc_message(
umax2s(getpid(), 10, buf_a),
" x USER 0x",
umax2s((uintptr_t)ut->r, 16, buf_b),
" = realloc(0x");
_malloc_message(
umax2s((uintptr_t)ut->p, 16, buf_a),
", ",
umax2s(ut->s, 10, buf_b),
")\n");
} else {
_malloc_message(
umax2s(getpid(), 10, buf_a),
" x USER free(0x",
umax2s((uintptr_t)ut->p, 16, buf_b),
")\n");
}
return (0);
}
#endif
static inline const char *
_getprogname(void)
{
return ("<jemalloc>");
}
#ifdef MALLOC_STATS
/*
* Print to stderr in such a way as to (hopefully) avoid memory allocation.
*/
static void
malloc_printf(const char *format, ...)
{
char buf[4096];
va_list ap;
va_start(ap, format);
vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
_malloc_message(buf, "", "", "");
}
#endif
/******************************************************************************/
static inline void
pages_decommit(void *addr, size_t size)
{
#ifdef MOZ_MEMORY_WINDOWS
VirtualFree(addr, size, MEM_DECOMMIT);
#else
if (mmap(addr, size, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1,
0) == MAP_FAILED)
abort();
#endif
}
static inline void
pages_commit(void *addr, size_t size)
{
# ifdef MOZ_MEMORY_WINDOWS
if (!VirtualAlloc(addr, size, MEM_COMMIT, PAGE_READWRITE))
abort();
# else
if (mmap(addr, size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE |
MAP_ANON, -1, 0) == MAP_FAILED)
abort();
# endif
}
static bool
base_pages_alloc_mmap(size_t minsize)
{
bool ret;
size_t csize;
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS)
size_t pminsize;
#endif
int pfd;
assert(minsize != 0);
csize = CHUNK_CEILING(minsize);
#ifdef MALLOC_PAGEFILE
if (opt_pagefile) {
pfd = pagefile_init(csize);
if (pfd == -1)
return (true);
} else
#endif
pfd = -1;
base_pages = pages_map(NULL, csize, pfd);
if (base_pages == NULL) {
ret = true;
goto RETURN;
}
base_next_addr = base_pages;
base_past_addr = (void *)((uintptr_t)base_pages + csize);
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS)
/*
* Leave enough pages for minsize committed, since otherwise they would
* have to be immediately recommitted.
*/
pminsize = PAGE_CEILING(minsize);
base_next_decommitted = (void *)((uintptr_t)base_pages + pminsize);
# if defined(MALLOC_DECOMMIT)
if (pminsize < csize)
pages_decommit(base_next_decommitted, csize - pminsize);
# endif
# ifdef MALLOC_STATS
base_mapped += csize;
base_committed += pminsize;
# endif
#endif
ret = false;
RETURN:
#ifdef MALLOC_PAGEFILE
if (pfd != -1)
pagefile_close(pfd);
#endif
return (false);
}
static bool
base_pages_alloc(size_t minsize)
{
if (base_pages_alloc_mmap(minsize) == false)
return (false);
return (true);
}
static void *
base_alloc(size_t size)
{
void *ret;
size_t csize;
/* Round size up to nearest multiple of the cacheline size. */
csize = CACHELINE_CEILING(size);
malloc_mutex_lock(&base_mtx);
/* Make sure there's enough space for the allocation. */
if ((uintptr_t)base_next_addr + csize > (uintptr_t)base_past_addr) {
if (base_pages_alloc(csize)) {
malloc_mutex_unlock(&base_mtx);
return (NULL);
}
}
/* Allocate. */
ret = base_next_addr;
base_next_addr = (void *)((uintptr_t)base_next_addr + csize);
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS)
/* Make sure enough pages are committed for the new allocation. */
if ((uintptr_t)base_next_addr > (uintptr_t)base_next_decommitted) {
void *pbase_next_addr =
(void *)(PAGE_CEILING((uintptr_t)base_next_addr));
# ifdef MALLOC_DECOMMIT
pages_commit(base_next_decommitted, (uintptr_t)pbase_next_addr -
(uintptr_t)base_next_decommitted);
# endif
base_next_decommitted = pbase_next_addr;
# ifdef MALLOC_STATS
base_committed += (uintptr_t)pbase_next_addr -
(uintptr_t)base_next_decommitted;
# endif
}
#endif
malloc_mutex_unlock(&base_mtx);
VALGRIND_MALLOCLIKE_BLOCK(ret, size, 0, false);
return (ret);
}
static void *
base_calloc(size_t number, size_t size)
{
void *ret;
ret = base_alloc(number * size);
#ifdef MALLOC_VALGRIND
if (ret != NULL) {
VALGRIND_FREELIKE_BLOCK(ret, 0);
VALGRIND_MALLOCLIKE_BLOCK(ret, size, 0, true);
}
#endif
memset(ret, 0, number * size);
return (ret);
}
static extent_node_t *
base_node_alloc(void)
{
extent_node_t *ret;
malloc_mutex_lock(&base_mtx);
if (base_nodes != NULL) {
ret = base_nodes;
base_nodes = *(extent_node_t **)ret;
VALGRIND_FREELIKE_BLOCK(ret, 0);
VALGRIND_MALLOCLIKE_BLOCK(ret, sizeof(extent_node_t), 0, false);
malloc_mutex_unlock(&base_mtx);
} else {
malloc_mutex_unlock(&base_mtx);
ret = (extent_node_t *)base_alloc(sizeof(extent_node_t));
}
return (ret);
}
static void
base_node_dealloc(extent_node_t *node)
{
malloc_mutex_lock(&base_mtx);
VALGRIND_FREELIKE_BLOCK(node, 0);
VALGRIND_MALLOCLIKE_BLOCK(node, sizeof(extent_node_t *), 0, false);
*(extent_node_t **)node = base_nodes;
base_nodes = node;
malloc_mutex_unlock(&base_mtx);
}
/******************************************************************************/
#ifdef MALLOC_STATS
static void
stats_print(arena_t *arena)
{
unsigned i, gap_start;
#ifdef MOZ_MEMORY_WINDOWS
malloc_printf("dirty: %Iu page%s dirty, %I64u sweep%s,"
" %I64u madvise%s, %I64u page%s purged\n",
arena->ndirty, arena->ndirty == 1 ? "" : "s",
arena->stats.npurge, arena->stats.npurge == 1 ? "" : "s",
arena->stats.nmadvise, arena->stats.nmadvise == 1 ? "" : "s",
arena->stats.purged, arena->stats.purged == 1 ? "" : "s");
# ifdef MALLOC_DECOMMIT
malloc_printf("decommit: %I64u decommit%s, %I64u commit%s,"
" %I64u page%s decommitted\n",
arena->stats.ndecommit, (arena->stats.ndecommit == 1) ? "" : "s",
arena->stats.ncommit, (arena->stats.ncommit == 1) ? "" : "s",
arena->stats.decommitted,
(arena->stats.decommitted == 1) ? "" : "s");
# endif
malloc_printf(" allocated nmalloc ndalloc\n");
malloc_printf("small: %12Iu %12I64u %12I64u\n",
arena->stats.allocated_small, arena->stats.nmalloc_small,
arena->stats.ndalloc_small);
malloc_printf("large: %12Iu %12I64u %12I64u\n",
arena->stats.allocated_large, arena->stats.nmalloc_large,
arena->stats.ndalloc_large);
malloc_printf("total: %12Iu %12I64u %12I64u\n",
arena->stats.allocated_small + arena->stats.allocated_large,
arena->stats.nmalloc_small + arena->stats.nmalloc_large,
arena->stats.ndalloc_small + arena->stats.ndalloc_large);
malloc_printf("mapped: %12Iu\n", arena->stats.mapped);
#else
malloc_printf("dirty: %zu page%s dirty, %llu sweep%s,"
" %llu madvise%s, %llu page%s purged\n",
arena->ndirty, arena->ndirty == 1 ? "" : "s",
arena->stats.npurge, arena->stats.npurge == 1 ? "" : "s",
arena->stats.nmadvise, arena->stats.nmadvise == 1 ? "" : "s",
arena->stats.purged, arena->stats.purged == 1 ? "" : "s");
# ifdef MALLOC_DECOMMIT
malloc_printf("decommit: %llu decommit%s, %llu commit%s,"
" %llu page%s decommitted\n",
arena->stats.ndecommit, (arena->stats.ndecommit == 1) ? "" : "s",
arena->stats.ncommit, (arena->stats.ncommit == 1) ? "" : "s",
arena->stats.decommitted,
(arena->stats.decommitted == 1) ? "" : "s");
# endif
malloc_printf(" allocated nmalloc ndalloc\n");
malloc_printf("small: %12zu %12llu %12llu\n",
arena->stats.allocated_small, arena->stats.nmalloc_small,
arena->stats.ndalloc_small);
malloc_printf("large: %12zu %12llu %12llu\n",
arena->stats.allocated_large, arena->stats.nmalloc_large,
arena->stats.ndalloc_large);
malloc_printf("total: %12zu %12llu %12llu\n",
arena->stats.allocated_small + arena->stats.allocated_large,
arena->stats.nmalloc_small + arena->stats.nmalloc_large,
arena->stats.ndalloc_small + arena->stats.ndalloc_large);
malloc_printf("mapped: %12zu\n", arena->stats.mapped);
#endif
malloc_printf("bins: bin size regs pgs requests newruns"
" reruns maxruns curruns\n");
for (i = 0, gap_start = UINT_MAX; i < ntbins + nqbins + nsbins; i++) {
if (arena->bins[i].stats.nrequests == 0) {
if (gap_start == UINT_MAX)
gap_start = i;
} else {
if (gap_start != UINT_MAX) {
if (i > gap_start + 1) {
/* Gap of more than one size class. */
malloc_printf("[%u..%u]\n",
gap_start, i - 1);
} else {
/* Gap of one size class. */
malloc_printf("[%u]\n", gap_start);
}
gap_start = UINT_MAX;
}
malloc_printf(
#if defined(MOZ_MEMORY_WINDOWS)
"%13u %1s %4u %4u %3u %9I64u %9I64u"
" %9I64u %7u %7u\n",
#else
"%13u %1s %4u %4u %3u %9llu %9llu"
" %9llu %7lu %7lu\n",
#endif
i,
i < ntbins ? "T" : i < ntbins + nqbins ? "Q" : "S",
arena->bins[i].reg_size,
arena->bins[i].nregs,
arena->bins[i].run_size >> pagesize_2pow,
arena->bins[i].stats.nrequests,
arena->bins[i].stats.nruns,
arena->bins[i].stats.reruns,
arena->bins[i].stats.highruns,
arena->bins[i].stats.curruns);
}
}
if (gap_start != UINT_MAX) {
if (i > gap_start + 1) {
/* Gap of more than one size class. */
malloc_printf("[%u..%u]\n", gap_start, i - 1);
} else {
/* Gap of one size class. */
malloc_printf("[%u]\n", gap_start);
}
}
}
#endif
/*
* End Utility functions/macros.
*/
/******************************************************************************/
/*
* Begin extent tree code.
*/
static inline int
extent_szad_comp(extent_node_t *a, extent_node_t *b)
{
int ret;
size_t a_size = a->size;
size_t b_size = b->size;
ret = (a_size > b_size) - (a_size < b_size);
if (ret == 0) {
uintptr_t a_addr = (uintptr_t)a->addr;
uintptr_t b_addr = (uintptr_t)b->addr;
ret = (a_addr > b_addr) - (a_addr < b_addr);
}
return (ret);
}
/* Wrap red-black tree macros in functions. */
rb_wrap(static, extent_tree_szad_, extent_tree_t, extent_node_t,
link_szad, extent_szad_comp)
static inline int
extent_ad_comp(extent_node_t *a, extent_node_t *b)
{
uintptr_t a_addr = (uintptr_t)a->addr;
uintptr_t b_addr = (uintptr_t)b->addr;
return ((a_addr > b_addr) - (a_addr < b_addr));
}
/* Wrap red-black tree macros in functions. */
rb_wrap(static, extent_tree_ad_, extent_tree_t, extent_node_t, link_ad,
extent_ad_comp)
/*
* End extent tree code.
*/
/******************************************************************************/
/*
* Begin chunk management functions.
*/
#ifdef MOZ_MEMORY_WINDOWS
static void *
pages_map(void *addr, size_t size, int pfd)
{
void *ret = NULL;
ret = VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE);
return (ret);
}
static void
pages_unmap(void *addr, size_t size)
{
if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
_malloc_message(_getprogname(),
": (malloc) Error in VirtualFree()\n", "", "");
if (opt_abort)
abort();
}
}
#else
#ifdef JEMALLOC_USES_MAP_ALIGN
static void *
pages_map_align(size_t size, int pfd, size_t alignment)
{
void *ret;
/*
* We don't use MAP_FIXED here, because it can cause the *replacement*
* of existing mappings, and we only want to create new mappings.
*/
#ifdef MALLOC_PAGEFILE
if (pfd != -1) {
ret = mmap((void *)alignment, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
MAP_NOSYNC | MAP_ALIGN, pfd, 0);
} else
#endif
{
ret = mmap((void *)alignment, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
MAP_NOSYNC | MAP_ALIGN | MAP_ANON, -1, 0);
}
assert(ret != NULL);
if (ret == MAP_FAILED)
ret = NULL;
return (ret);
}
#endif
static void *
pages_map(void *addr, size_t size, int pfd)
{
void *ret;
#if defined(__ia64__)
/*
* The JS engine assumes that all allocated pointers have their high 17 bits clear,
* which ia64's mmap doesn't support directly. However, we can emulate it by passing
* mmap an "addr" parameter with those bits clear. The mmap will return that address,
* or the nearest available memory above that address, providing a near-guarantee
* that those bits are clear. If they are not, we return NULL below to indicate
* out-of-memory.
*
* The addr is chosen as 0x0000070000000000, which still allows about 120TB of virtual
* address space.
*
* See Bug 589735 for more information.
*/
bool check_placement = true;
if (addr == NULL) {
addr = (void*)0x0000070000000000;
check_placement = false;
}
#endif
/*
* We don't use MAP_FIXED here, because it can cause the *replacement*
* of existing mappings, and we only want to create new mappings.
*/
#ifdef MALLOC_PAGEFILE
if (pfd != -1) {
ret = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
MAP_NOSYNC, pfd, 0);
} else
#endif
{
ret = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
MAP_ANON, -1, 0);
}
assert(ret != NULL);
if (ret == MAP_FAILED) {
ret = NULL;
}
#if defined(__ia64__)
/*
* If the allocated memory doesn't have its upper 17 bits clear, consider it
* as out of memory.
*/
else if ((long long)ret & 0xffff800000000000) {
munmap(ret, size);
ret = NULL;
}
/* If the caller requested a specific memory location, verify that's what mmap returned. */
else if (check_placement && ret != addr) {
#else
else if (addr != NULL && ret != addr) {
#endif
/*
* We succeeded in mapping memory, but not in the right place.
*/
if (munmap(ret, size) == -1) {
char buf[STRERROR_BUF];
strerror_r(errno, buf, sizeof(buf));
_malloc_message(_getprogname(),
": (malloc) Error in munmap(): ", buf, "\n");
if (opt_abort)
abort();
}
ret = NULL;
}
#if defined(__ia64__)
assert(ret == NULL || (!check_placement && ret != NULL)
|| (check_placement && ret == addr));
#else
assert(ret == NULL || (addr == NULL && ret != addr)
|| (addr != NULL && ret == addr));
#endif
return (ret);
}
static void
pages_unmap(void *addr, size_t size)
{
if (munmap(addr, size) == -1) {
char buf[STRERROR_BUF];
strerror_r(errno, buf, sizeof(buf));
_malloc_message(_getprogname(),
": (malloc) Error in munmap(): ", buf, "\n");
if (opt_abort)
abort();
}
}
#endif
#ifdef MOZ_MEMORY_DARWIN
#define VM_COPY_MIN (pagesize << 5)
static inline void
pages_copy(void *dest, const void *src, size_t n)
{
assert((void *)((uintptr_t)dest & ~pagesize_mask) == dest);
assert(n >= VM_COPY_MIN);
assert((void *)((uintptr_t)src & ~pagesize_mask) == src);
vm_copy(mach_task_self(), (vm_address_t)src, (vm_size_t)n,
(vm_address_t)dest);
}
#endif
#ifdef MALLOC_VALIDATE
static inline malloc_rtree_t *
malloc_rtree_new(unsigned bits)
{
malloc_rtree_t *ret;
unsigned bits_per_level, height, i;
bits_per_level = ffs(pow2_ceil((MALLOC_RTREE_NODESIZE /
sizeof(void *)))) - 1;
height = bits / bits_per_level;
if (height * bits_per_level != bits)
height++;
RELEASE_ASSERT(height * bits_per_level >= bits);
ret = (malloc_rtree_t*)base_calloc(1, sizeof(malloc_rtree_t) +
(sizeof(unsigned) * (height - 1)));
if (ret == NULL)
return (NULL);
malloc_spin_init(&ret->lock);
ret->height = height;
if (bits_per_level * height > bits)
ret->level2bits[0] = bits % bits_per_level;
else
ret->level2bits[0] = bits_per_level;
for (i = 1; i < height; i++)
ret->level2bits[i] = bits_per_level;
ret->root = (void**)base_calloc(1, sizeof(void *) << ret->level2bits[0]);
if (ret->root == NULL) {
/*
* We leak the rtree here, since there's no generic base
* deallocation.
*/
return (NULL);
}
return (ret);
}
#define MALLOC_RTREE_GET_GENERATE(f) \
/* The least significant bits of the key are ignored. */ \
static inline void * \
f(malloc_rtree_t *rtree, uintptr_t key) \
{ \
void *ret; \
uintptr_t subkey; \
unsigned i, lshift, height, bits; \
void **node, **child; \
\
MALLOC_RTREE_LOCK(&rtree->lock); \
for (i = lshift = 0, height = rtree->height, node = rtree->root;\
i < height - 1; \
i++, lshift += bits, node = child) { \
bits = rtree->level2bits[i]; \
subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); \
child = (void**)node[subkey]; \
if (child == NULL) { \
MALLOC_RTREE_UNLOCK(&rtree->lock); \
return (NULL); \
} \
} \
\
/* \
* node is a leaf, so it contains values rather than node \
* pointers. \
*/ \
bits = rtree->level2bits[i]; \
subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits); \
ret = node[subkey]; \
MALLOC_RTREE_UNLOCK(&rtree->lock); \
\
MALLOC_RTREE_GET_VALIDATE \
return (ret); \
}
#ifdef MALLOC_DEBUG
# define MALLOC_RTREE_LOCK(l) malloc_spin_lock(l)
# define MALLOC_RTREE_UNLOCK(l) malloc_spin_unlock(l)
# define MALLOC_RTREE_GET_VALIDATE
MALLOC_RTREE_GET_GENERATE(malloc_rtree_get_locked)
# undef MALLOC_RTREE_LOCK
# undef MALLOC_RTREE_UNLOCK
# undef MALLOC_RTREE_GET_VALIDATE
#endif
#define MALLOC_RTREE_LOCK(l)
#define MALLOC_RTREE_UNLOCK(l)
#ifdef MALLOC_DEBUG
/*
* Suppose that it were possible for a jemalloc-allocated chunk to be
* munmap()ped, followed by a different allocator in another thread re-using
* overlapping virtual memory, all without invalidating the cached rtree
* value. The result would be a false positive (the rtree would claim that
* jemalloc owns memory that it had actually discarded). I don't think this
* scenario is possible, but the following assertion is a prudent sanity
* check.
*/
# define MALLOC_RTREE_GET_VALIDATE \
assert(malloc_rtree_get_locked(rtree, key) == ret);
#else
# define MALLOC_RTREE_GET_VALIDATE
#endif
MALLOC_RTREE_GET_GENERATE(malloc_rtree_get)
#undef MALLOC_RTREE_LOCK
#undef MALLOC_RTREE_UNLOCK
#undef MALLOC_RTREE_GET_VALIDATE
static inline bool
malloc_rtree_set(malloc_rtree_t *rtree, uintptr_t key, void *val)
{
uintptr_t subkey;
unsigned i, lshift, height, bits;
void **node, **child;
malloc_spin_lock(&rtree->lock);
for (i = lshift = 0, height = rtree->height, node = rtree->root;
i < height - 1;
i++, lshift += bits, node = child) {
bits = rtree->level2bits[i];
subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits);
child = (void**)node[subkey];
if (child == NULL) {
child = (void**)base_calloc(1, sizeof(void *) <<
rtree->level2bits[i+1]);
if (child == NULL) {
malloc_spin_unlock(&rtree->lock);
return (true);
}
node[subkey] = child;
}
}
/* node is a leaf, so it contains values rather than node pointers. */
bits = rtree->level2bits[i];
subkey = (key << lshift) >> ((SIZEOF_PTR << 3) - bits);
node[subkey] = val;
malloc_spin_unlock(&rtree->lock);
return (false);
}
#endif
#if defined(MOZ_MEMORY_WINDOWS) || defined(JEMALLOC_USES_MAP_ALIGN) || defined(MALLOC_PAGEFILE)
/* Allocate an aligned chunk while maintaining a 1:1 correspondence between
* mmap and unmap calls. This is important on Windows, but not elsewhere. */
static void *
chunk_alloc_mmap(size_t size, bool pagefile)
{
void *ret;
#ifndef JEMALLOC_USES_MAP_ALIGN
size_t offset;
#endif
int pfd;
#ifdef MALLOC_PAGEFILE
if (opt_pagefile && pagefile) {
pfd = pagefile_init(size);
if (pfd == -1)
return (NULL);
} else
#endif
pfd = -1;
#ifdef JEMALLOC_USES_MAP_ALIGN
ret = pages_map_align(size, pfd, chunksize);
#else
ret = pages_map(NULL, size, pfd);
if (ret == NULL)
goto RETURN;
offset = CHUNK_ADDR2OFFSET(ret);
if (offset != 0) {
/* Deallocate, then try to allocate at (ret + size - offset). */
pages_unmap(ret, size);
ret = pages_map((void *)((uintptr_t)ret + size - offset), size,
pfd);
while (ret == NULL) {
/*
* Over-allocate in order to map a memory region that
* is definitely large enough.
*/
ret = pages_map(NULL, size + chunksize, -1);
if (ret == NULL)
goto RETURN;
/*
* Deallocate, then allocate the correct size, within
* the over-sized mapping.
*/
offset = CHUNK_ADDR2OFFSET(ret);
pages_unmap(ret, size + chunksize);
if (offset == 0)
ret = pages_map(ret, size, pfd);
else {
ret = pages_map((void *)((uintptr_t)ret +
chunksize - offset), size, pfd);
}
/*
* Failure here indicates a race with another thread, so
* try again.
*/
}
}
RETURN:
#endif
#ifdef MALLOC_PAGEFILE
if (pfd != -1)
pagefile_close(pfd);
#endif
return (ret);
}
#else /* ! (defined(MOZ_MEMORY_WINDOWS) || defined(JEMALLOC_USES_MAP_ALIGN) || defined(MALLOC_PAGEFILE)) */
/*
* Used by chunk_alloc_mmap() to decide whether to attempt the fast path and
* potentially avoid some system calls.
*/
#ifndef NO_TLS
static __thread bool mmap_unaligned_tls __attribute__((tls_model("initial-exec")));
#define MMAP_UNALIGNED_GET() mmap_unaligned_tls
#define MMAP_UNALIGNED_SET(v) do { \
mmap_unaligned_tls = (v); \
} while (0)
#else
#define NEEDS_PTHREAD_MMAP_UNALIGNED_TSD
static pthread_key_t mmap_unaligned_tsd;
#define MMAP_UNALIGNED_GET() ((bool)pthread_getspecific(mmap_unaligned_tsd))
#define MMAP_UNALIGNED_SET(v) do { \
pthread_setspecific(mmap_unaligned_tsd, (void *)(v)); \
} while (0)
#endif
/* chunk_alloc_mmap_slow and chunk_alloc_mmap were cherry-picked from upstream
* jemalloc 2.2.3 to fix Mozilla bug 694896, enable jemalloc on Mac 10.7. */
static void *
chunk_alloc_mmap_slow(size_t size, bool unaligned)
{
void *ret;
size_t offset;
/* Beware size_t wrap-around. */
if (size + chunksize <= size)
return (NULL);
ret = pages_map(NULL, size + chunksize, -1);
if (ret == NULL)
return (NULL);
/* Clean up unneeded leading/trailing space. */
offset = CHUNK_ADDR2OFFSET(ret);
if (offset != 0) {
/* Note that mmap() returned an unaligned mapping. */
unaligned = true;
/* Leading space. */
pages_unmap(ret, chunksize - offset);
ret = (void *)((uintptr_t)ret +
(chunksize - offset));
/* Trailing space. */
pages_unmap((void *)((uintptr_t)ret + size),
offset);
} else {
/* Trailing space only. */
pages_unmap((void *)((uintptr_t)ret + size),
chunksize);
}
/*
* If mmap() returned an aligned mapping, reset mmap_unaligned so that
* the next chunk_alloc_mmap() execution tries the fast allocation
* method.
*/
if (unaligned == false)
MMAP_UNALIGNED_SET(false);
return (ret);
}
static void *
chunk_alloc_mmap(size_t size, bool pagefile)
{
void *ret;
/*
* Ideally, there would be a way to specify alignment to mmap() (like
* NetBSD has), but in the absence of such a feature, we have to work
* hard to efficiently create aligned mappings. The reliable, but
* slow method is to create a mapping that is over-sized, then trim the
* excess. However, that always results in at least one call to
* pages_unmap().
*
* A more optimistic approach is to try mapping precisely the right
* amount, then try to append another mapping if alignment is off. In
* practice, this works out well as long as the application is not
* interleaving mappings via direct mmap() calls. If we do run into a
* situation where there is an interleaved mapping and we are unable to
* extend an unaligned mapping, our best option is to switch to the
* slow method until mmap() returns another aligned mapping. This will
* tend to leave a gap in the memory map that is too small to cause
* later problems for the optimistic method.
*
* Another possible confounding factor is address space layout
* randomization (ASLR), which causes mmap(2) to disregard the
* requested address. mmap_unaligned tracks whether the previous
* chunk_alloc_mmap() execution received any unaligned or relocated
* mappings, and if so, the current execution will immediately fall
* back to the slow method. However, we keep track of whether the fast
* method would have succeeded, and if so, we make a note to try the
* fast method next time.
*/
if (MMAP_UNALIGNED_GET() == false) {
size_t offset;
ret = pages_map(NULL, size, -1);
if (ret == NULL)
return (NULL);
offset = CHUNK_ADDR2OFFSET(ret);
if (offset != 0) {
MMAP_UNALIGNED_SET(true);
/* Try to extend chunk boundary. */
if (pages_map((void *)((uintptr_t)ret + size),
chunksize - offset, -1) == NULL) {
/*
* Extension failed. Clean up, then revert to
* the reliable-but-expensive method.
*/
pages_unmap(ret, size);
ret = chunk_alloc_mmap_slow(size, true);
} else {
/* Clean up unneeded leading space. */
pages_unmap(ret, chunksize - offset);
ret = (void *)((uintptr_t)ret + (chunksize -
offset));
}
}
} else
ret = chunk_alloc_mmap_slow(size, false);
return (ret);
}
#endif /* defined(MOZ_MEMORY_WINDOWS) || defined(JEMALLOC_USES_MAP_ALIGN) || defined(MALLOC_PAGEFILE) */
#ifdef MALLOC_PAGEFILE
static int
pagefile_init(size_t size)
{
int ret;
size_t i;
char pagefile_path[PATH_MAX];
char zbuf[MALLOC_PAGEFILE_WRITE_SIZE];
/*
* Create a temporary file, then immediately unlink it so that it will
* not persist.
*/
strcpy(pagefile_path, pagefile_templ);
ret = mkstemp(pagefile_path);
if (ret == -1)
return (ret);
if (unlink(pagefile_path)) {
char buf[STRERROR_BUF];
strerror_r(errno, buf, sizeof(buf));
_malloc_message(_getprogname(), ": (malloc) Error in unlink(\"",
pagefile_path, "\"):");
_malloc_message(buf, "\n", "", "");
if (opt_abort)
abort();
}
/*
* Write sequential zeroes to the file in order to assure that disk
* space is committed, with minimal fragmentation. It would be
* sufficient to write one zero per disk block, but that potentially
* results in more system calls, for no real gain.
*/
memset(zbuf, 0, sizeof(zbuf));
for (i = 0; i < size; i += sizeof(zbuf)) {
if (write(ret, zbuf, sizeof(zbuf)) != sizeof(zbuf)) {
if (errno != ENOSPC) {
char buf[STRERROR_BUF];
strerror_r(errno, buf, sizeof(buf));
_malloc_message(_getprogname(),
": (malloc) Error in write(): ", buf, "\n");
if (opt_abort)
abort();
}
pagefile_close(ret);
return (-1);
}
}
return (ret);
}
static void
pagefile_close(int pfd)
{
if (close(pfd)) {
char buf[STRERROR_BUF];
strerror_r(errno, buf, sizeof(buf));
_malloc_message(_getprogname(),
": (malloc) Error in close(): ", buf, "\n");
if (opt_abort)
abort();
}
}
#endif
static void *
chunk_alloc(size_t size, bool zero, bool pagefile)
{
void *ret;
assert(size != 0);
assert((size & chunksize_mask) == 0);
ret = chunk_alloc_mmap(size, pagefile);
if (ret != NULL) {
goto RETURN;
}
/* All strategies for allocation failed. */
ret = NULL;
RETURN:
#ifdef MALLOC_VALIDATE
if (ret != NULL) {
if (malloc_rtree_set(chunk_rtree, (uintptr_t)ret, ret)) {
chunk_dealloc(ret, size);
return (NULL);
}
}
#endif
assert(CHUNK_ADDR2BASE(ret) == ret);
return (ret);
}
static void
chunk_dealloc_mmap(void *chunk, size_t size)
{
pages_unmap(chunk, size);
}
static void
chunk_dealloc(void *chunk, size_t size)
{
assert(chunk != NULL);
assert(CHUNK_ADDR2BASE(chunk) == chunk);
assert(size != 0);
assert((size & chunksize_mask) == 0);
#ifdef MALLOC_VALIDATE
malloc_rtree_set(chunk_rtree, (uintptr_t)chunk, NULL);
#endif
chunk_dealloc_mmap(chunk, size);
}
/*
* End chunk management functions.
*/
/******************************************************************************/
/*
* Begin arena.
*/
/*
* Choose an arena based on a per-thread value (fast-path code, calls slow-path
* code if necessary).
*/
static inline arena_t *
choose_arena(void)
{
arena_t *ret;
/*
* We can only use TLS if this is a PIC library, since for the static
* library version, libc's malloc is used by TLS allocation, which
* introduces a bootstrapping issue.
*/
#ifndef NO_TLS
if (isthreaded == false) {
/* Avoid the overhead of TLS for single-threaded operation. */
return (arenas[0]);
}
# ifdef MOZ_MEMORY_WINDOWS
ret = (arena_t*)TlsGetValue(tlsIndex);
# else
ret = arenas_map;
# endif
if (ret == NULL) {
ret = choose_arena_hard();
RELEASE_ASSERT(ret != NULL);
}
#else
if (isthreaded && narenas > 1) {
unsigned long ind;
/*
* Hash _pthread_self() to one of the arenas. There is a prime
* number of arenas, so this has a reasonable chance of
* working. Even so, the hashing can be easily thwarted by
* inconvenient _pthread_self() values. Without specific
* knowledge of how _pthread_self() calculates values, we can't
* easily do much better than this.
*/
ind = (unsigned long) _pthread_self() % narenas;
/*
* Optimistially assume that arenas[ind] has been initialized.
* At worst, we find out that some other thread has already
* done so, after acquiring the lock in preparation. Note that
* this lazy locking also has the effect of lazily forcing
* cache coherency; without the lock acquisition, there's no
* guarantee that modification of arenas[ind] by another thread
* would be seen on this CPU for an arbitrary amount of time.
*
* In general, this approach to modifying a synchronized value
* isn't a good idea, but in this case we only ever modify the
* value once, so things work out well.
*/
ret = arenas[ind];
if (ret == NULL) {
/*
* Avoid races with another thread that may have already
* initialized arenas[ind].
*/
malloc_spin_lock(&arenas_lock);
if (arenas[ind] == NULL)
ret = arenas_extend((unsigned)ind);
else
ret = arenas[ind];
malloc_spin_unlock(&arenas_lock);
}
} else
ret = arenas[0];
#endif
RELEASE_ASSERT(ret != NULL);
return (ret);
}
#ifndef NO_TLS
/*
* Choose an arena based on a per-thread value (slow-path code only, called
* only by choose_arena()).
*/
static arena_t *
choose_arena_hard(void)
{
arena_t *ret;
assert(isthreaded);
#ifdef MALLOC_BALANCE
/* Seed the PRNG used for arena load balancing. */
SPRN(balance, (uint32_t)(uintptr_t)(_pthread_self()));
#endif
if (narenas > 1) {
#ifdef MALLOC_BALANCE
unsigned ind;
ind = PRN(balance, narenas_2pow);
if ((ret = arenas[ind]) == NULL) {
malloc_spin_lock(&arenas_lock);
if ((ret = arenas[ind]) == NULL)
ret = arenas_extend(ind);
malloc_spin_unlock(&arenas_lock);
}
#else
malloc_spin_lock(&arenas_lock);
if ((ret = arenas[next_arena]) == NULL)
ret = arenas_extend(next_arena);
next_arena = (next_arena + 1) % narenas;
malloc_spin_unlock(&arenas_lock);
#endif
} else
ret = arenas[0];
#ifdef MOZ_MEMORY_WINDOWS
TlsSetValue(tlsIndex, ret);
#else
arenas_map = ret;
#endif
return (ret);
}
#endif
static inline int
arena_chunk_comp(arena_chunk_t *a, arena_chunk_t *b)
{
uintptr_t a_chunk = (uintptr_t)a;
uintptr_t b_chunk = (uintptr_t)b;
assert(a != NULL);
assert(b != NULL);
return ((a_chunk > b_chunk) - (a_chunk < b_chunk));
}
/* Wrap red-black tree macros in functions. */
rb_wrap(static, arena_chunk_tree_dirty_, arena_chunk_tree_t,
arena_chunk_t, link_dirty, arena_chunk_comp)
static inline int
arena_run_comp(arena_chunk_map_t *a, arena_chunk_map_t *b)
{
uintptr_t a_mapelm = (uintptr_t)a;
uintptr_t b_mapelm = (uintptr_t)b;
assert(a != NULL);
assert(b != NULL);
return ((a_mapelm > b_mapelm) - (a_mapelm < b_mapelm));
}
/* Wrap red-black tree macros in functions. */
rb_wrap(static, arena_run_tree_, arena_run_tree_t, arena_chunk_map_t, link,
arena_run_comp)
static inline int
arena_avail_comp(arena_chunk_map_t *a, arena_chunk_map_t *b)
{
int ret;
size_t a_size = a->bits & ~pagesize_mask;
size_t b_size = b->bits & ~pagesize_mask;
ret = (a_size > b_size) - (a_size < b_size);
if (ret == 0) {
uintptr_t a_mapelm, b_mapelm;
if ((a->bits & CHUNK_MAP_KEY) == 0)
a_mapelm = (uintptr_t)a;
else {
/*
* Treat keys as though they are lower than anything
* else.
*/
a_mapelm = 0;
}
b_mapelm = (uintptr_t)b;
ret = (a_mapelm > b_mapelm) - (a_mapelm < b_mapelm);
}
return (ret);
}
/* Wrap red-black tree macros in functions. */
rb_wrap(static, arena_avail_tree_, arena_avail_tree_t, arena_chunk_map_t, link,
arena_avail_comp)
static inline void *
arena_run_reg_alloc(arena_run_t *run, arena_bin_t *bin)
{
void *ret;
unsigned i, mask, bit, regind;
assert(run->magic == ARENA_RUN_MAGIC);
assert(run->regs_minelm < bin->regs_mask_nelms);
/*
* Move the first check outside the loop, so that run->regs_minelm can
* be updated unconditionally, without the possibility of updating it
* multiple times.
*/
i = run->regs_minelm;
mask = run->regs_mask[i];
if (mask != 0) {
/* Usable allocation found. */
bit = ffs((int)mask) - 1;
regind = ((i << (SIZEOF_INT_2POW + 3)) + bit);
assert(regind < bin->nregs);
ret = (void *)(((uintptr_t)run) + bin->reg0_offset
+ (bin->reg_size * regind));
/* Clear bit. */
mask ^= (1U << bit);
run->regs_mask[i] = mask;
return (ret);
}
for (i++; i < bin->regs_mask_nelms; i++) {
mask = run->regs_mask[i];
if (mask != 0) {
/* Usable allocation found. */
bit = ffs((int)mask) - 1;
regind = ((i << (SIZEOF_INT_2POW + 3)) + bit);
assert(regind < bin->nregs);
ret = (void *)(((uintptr_t)run) + bin->reg0_offset
+ (bin->reg_size * regind));
/* Clear bit. */
mask ^= (1U << bit);
run->regs_mask[i] = mask;
/*
* Make a note that nothing before this element
* contains a free region.
*/
run->regs_minelm = i; /* Low payoff: + (mask == 0); */
return (ret);
}
}
/* Not reached. */
RELEASE_ASSERT(0);
return (NULL);
}
static inline void
arena_run_reg_dalloc(arena_run_t *run, arena_bin_t *bin, void *ptr, size_t size)
{
/*
* To divide by a number D that is not a power of two we multiply
* by (2^21 / D) and then right shift by 21 positions.
*
* X / D
*
* becomes
*
* (X * size_invs[(D >> QUANTUM_2POW_MIN) - 3]) >> SIZE_INV_SHIFT
*/
#define SIZE_INV_SHIFT 21
#define SIZE_INV(s) (((1U << SIZE_INV_SHIFT) / (s << QUANTUM_2POW_MIN)) + 1)
static const unsigned size_invs[] = {
SIZE_INV(3),
SIZE_INV(4), SIZE_INV(5), SIZE_INV(6), SIZE_INV(7),
SIZE_INV(8), SIZE_INV(9), SIZE_INV(10), SIZE_INV(11),
SIZE_INV(12),SIZE_INV(13), SIZE_INV(14), SIZE_INV(15),
SIZE_INV(16),SIZE_INV(17), SIZE_INV(18), SIZE_INV(19),
SIZE_INV(20),SIZE_INV(21), SIZE_INV(22), SIZE_INV(23),
SIZE_INV(24),SIZE_INV(25), SIZE_INV(26), SIZE_INV(27),
SIZE_INV(28),SIZE_INV(29), SIZE_INV(30), SIZE_INV(31)
#if (QUANTUM_2POW_MIN < 4)
,
SIZE_INV(32), SIZE_INV(33), SIZE_INV(34), SIZE_INV(35),
SIZE_INV(36), SIZE_INV(37), SIZE_INV(38), SIZE_INV(39),
SIZE_INV(40), SIZE_INV(41), SIZE_INV(42), SIZE_INV(43),
SIZE_INV(44), SIZE_INV(45), SIZE_INV(46), SIZE_INV(47),
SIZE_INV(48), SIZE_INV(49), SIZE_INV(50), SIZE_INV(51),
SIZE_INV(52), SIZE_INV(53), SIZE_INV(54), SIZE_INV(55),
SIZE_INV(56), SIZE_INV(57), SIZE_INV(58), SIZE_INV(59),
SIZE_INV(60), SIZE_INV(61), SIZE_INV(62), SIZE_INV(63)
#endif
};
unsigned diff, regind, elm, bit;
assert(run->magic == ARENA_RUN_MAGIC);
assert(((sizeof(size_invs)) / sizeof(unsigned)) + 3
>= (SMALL_MAX_DEFAULT >> QUANTUM_2POW_MIN));
/*
* Avoid doing division with a variable divisor if possible. Using
* actual division here can reduce allocator throughput by over 20%!
*/
diff = (unsigned)((uintptr_t)ptr - (uintptr_t)run - bin->reg0_offset);
if ((size & (size - 1)) == 0) {
/*
* log2_table allows fast division of a power of two in the
* [1..128] range.
*
* (x / divisor) becomes (x >> log2_table[divisor - 1]).
*/
static const unsigned char log2_table[] = {
0, 1, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7
};
if (size <= 128)
regind = (diff >> log2_table[size - 1]);
else if (size <= 32768)
regind = diff >> (8 + log2_table[(size >> 8) - 1]);
else {
/*
* The run size is too large for us to use the lookup
* table. Use real division.
*/
regind = diff / size;
}
} else if (size <= ((sizeof(size_invs) / sizeof(unsigned))
<< QUANTUM_2POW_MIN) + 2) {
regind = size_invs[(size >> QUANTUM_2POW_MIN) - 3] * diff;
regind >>= SIZE_INV_SHIFT;
} else {
/*
* size_invs isn't large enough to handle this size class, so
* calculate regind using actual division. This only happens
* if the user increases small_max via the 'S' runtime
* configuration option.
*/
regind = diff / size;
};
RELEASE_ASSERT(diff == regind * size);
RELEASE_ASSERT(regind < bin->nregs);
elm = regind >> (SIZEOF_INT_2POW + 3);
if (elm < run->regs_minelm)
run->regs_minelm = elm;
bit = regind - (elm << (SIZEOF_INT_2POW + 3));
RELEASE_ASSERT((run->regs_mask[elm] & (1U << bit)) == 0);
run->regs_mask[elm] |= (1U << bit);
#undef SIZE_INV
#undef SIZE_INV_SHIFT
}
static void
arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large,
bool zero)
{
arena_chunk_t *chunk;
size_t old_ndirty, run_ind, total_pages, need_pages, rem_pages, i;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
old_ndirty = chunk->ndirty;
run_ind = (unsigned)(((uintptr_t)run - (uintptr_t)chunk)
>> pagesize_2pow);
total_pages = (chunk->map[run_ind].bits & ~pagesize_mask) >>
pagesize_2pow;
need_pages = (size >> pagesize_2pow);
assert(need_pages > 0);
assert(need_pages <= total_pages);
rem_pages = total_pages - need_pages;
arena_avail_tree_remove(&arena->runs_avail, &chunk->map[run_ind]);
/* Keep track of trailing unused pages for later use. */
if (rem_pages > 0) {
chunk->map[run_ind+need_pages].bits = (rem_pages <<
pagesize_2pow) | (chunk->map[run_ind+need_pages].bits &
pagesize_mask);
chunk->map[run_ind+total_pages-1].bits = (rem_pages <<
pagesize_2pow) | (chunk->map[run_ind+total_pages-1].bits &
pagesize_mask);
arena_avail_tree_insert(&arena->runs_avail,
&chunk->map[run_ind+need_pages]);
}
for (i = 0; i < need_pages; i++) {
#if defined(MALLOC_DECOMMIT) || defined(MALLOC_STATS) || defined(MALLOC_DOUBLE_PURGE)
/*
* Commit decommitted pages if necessary. If a decommitted
* page is encountered, commit all needed adjacent decommitted
* pages in one operation, in order to reduce system call
* overhead.
*/
if (chunk->map[run_ind + i].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED) {
size_t j;
/*
* Advance i+j to just past the index of the last page
* to commit. Clear CHUNK_MAP_DECOMMITTED and
* CHUNK_MAP_MADVISED along the way.
*/
for (j = 0; i + j < need_pages && (chunk->map[run_ind +
i + j].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED); j++) {
/* DECOMMITTED and MADVISED are mutually exclusive. */
assert(!(chunk->map[run_ind + i + j].bits & CHUNK_MAP_DECOMMITTED &&
chunk->map[run_ind + i + j].bits & CHUNK_MAP_MADVISED));
chunk->map[run_ind + i + j].bits &=
~CHUNK_MAP_MADVISED_OR_DECOMMITTED;
}
# ifdef MALLOC_DECOMMIT
pages_commit((void *)((uintptr_t)chunk + ((run_ind + i)
<< pagesize_2pow)), (j << pagesize_2pow));
# ifdef MALLOC_STATS
arena->stats.ncommit++;
# endif
# endif
# ifdef MALLOC_STATS
arena->stats.committed += j;
# endif
# ifndef MALLOC_DECOMMIT
}
# else
} else /* No need to zero since commit zeros. */
# endif
#endif
/* Zero if necessary. */
if (zero) {
if ((chunk->map[run_ind + i].bits & CHUNK_MAP_ZEROED)
== 0) {
VALGRIND_MALLOCLIKE_BLOCK((void *)((uintptr_t)
chunk + ((run_ind + i) << pagesize_2pow)),
pagesize, 0, false);
memset((void *)((uintptr_t)chunk + ((run_ind
+ i) << pagesize_2pow)), 0, pagesize);
VALGRIND_FREELIKE_BLOCK((void *)((uintptr_t)
chunk + ((run_ind + i) << pagesize_2pow)),
0);
/* CHUNK_MAP_ZEROED is cleared below. */
}
}
/* Update dirty page accounting. */
if (chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) {
chunk->ndirty--;
arena->ndirty--;
/* CHUNK_MAP_DIRTY is cleared below. */
}
/* Initialize the chunk map. */
if (large) {
chunk->map[run_ind + i].bits = CHUNK_MAP_LARGE
| CHUNK_MAP_ALLOCATED;
} else {
chunk->map[run_ind + i].bits = (size_t)run
| CHUNK_MAP_ALLOCATED;
}
}
/*
* Set the run size only in the first element for large runs. This is
* primarily a debugging aid, since the lack of size info for trailing
* pages only matters if the application tries to operate on an
* interior pointer.
*/
if (large)
chunk->map[run_ind].bits |= size;
if (chunk->ndirty == 0 && old_ndirty > 0)
arena_chunk_tree_dirty_remove(&arena->chunks_dirty, chunk);
}
static void
arena_chunk_init(arena_t *arena, arena_chunk_t *chunk)
{
arena_run_t *run;
size_t i;
VALGRIND_MALLOCLIKE_BLOCK(chunk, (arena_chunk_header_npages <<
pagesize_2pow), 0, false);
#ifdef MALLOC_STATS
arena->stats.mapped += chunksize;
#endif
chunk->arena = arena;
/*
* Claim that no pages are in use, since the header is merely overhead.
*/
chunk->ndirty = 0;
/* Initialize the map to contain one maximal free untouched run. */
run = (arena_run_t *)((uintptr_t)chunk + (arena_chunk_header_npages <<
pagesize_2pow));
for (i = 0; i < arena_chunk_header_npages; i++)
chunk->map[i].bits = 0;
chunk->map[i].bits = arena_maxclass | CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED;
for (i++; i < chunk_npages-1; i++) {
chunk->map[i].bits = CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED;
}
chunk->map[chunk_npages-1].bits = arena_maxclass | CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED;
#ifdef MALLOC_DECOMMIT
/*
* Start out decommitted, in order to force a closer correspondence
* between dirty pages and committed untouched pages.
*/
pages_decommit(run, arena_maxclass);
# ifdef MALLOC_STATS
arena->stats.ndecommit++;
arena->stats.decommitted += (chunk_npages - arena_chunk_header_npages);
# endif
#endif
#ifdef MALLOC_STATS
arena->stats.committed += arena_chunk_header_npages;
#endif
/* Insert the run into the runs_avail tree. */
arena_avail_tree_insert(&arena->runs_avail,
&chunk->map[arena_chunk_header_npages]);
#ifdef MALLOC_DOUBLE_PURGE
LinkedList_Init(&chunk->chunks_madvised_elem);
#endif
}
static void
arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk)
{
if (arena->spare != NULL) {
if (arena->spare->ndirty > 0) {
arena_chunk_tree_dirty_remove(
&chunk->arena->chunks_dirty, arena->spare);
arena->ndirty -= arena->spare->ndirty;
#ifdef MALLOC_STATS
arena->stats.committed -= arena->spare->ndirty;
#endif
}
#ifdef MALLOC_DOUBLE_PURGE
/* This is safe to do even if arena->spare is not in the list. */
LinkedList_Remove(&arena->spare->chunks_madvised_elem);
#endif
VALGRIND_FREELIKE_BLOCK(arena->spare, 0);
chunk_dealloc((void *)arena->spare, chunksize);
#ifdef MALLOC_STATS
arena->stats.mapped -= chunksize;
arena->stats.committed -= arena_chunk_header_npages;
#endif
}
/*
* Remove run from runs_avail, so that the arena does not use it.
* Dirty page flushing only uses the chunks_dirty tree, so leaving this
* chunk in the chunks_* trees is sufficient for that purpose.
*/
arena_avail_tree_remove(&arena->runs_avail,
&chunk->map[arena_chunk_header_npages]);
arena->spare = chunk;
}
static arena_run_t *
arena_run_alloc(arena_t *arena, arena_bin_t *bin, size_t size, bool large,
bool zero)
{
arena_run_t *run;
arena_chunk_map_t *mapelm, key;
assert(size <= arena_maxclass);
assert((size & pagesize_mask) == 0);
/* Search the arena's chunks for the lowest best fit. */
key.bits = size | CHUNK_MAP_KEY;
mapelm = arena_avail_tree_nsearch(&arena->runs_avail, &key);
if (mapelm != NULL) {
arena_chunk_t *chunk =
(arena_chunk_t*)CHUNK_ADDR2BASE(mapelm);
size_t pageind = ((uintptr_t)mapelm -
(uintptr_t)chunk->map) /
sizeof(arena_chunk_map_t);
run = (arena_run_t *)((uintptr_t)chunk + (pageind
<< pagesize_2pow));
arena_run_split(arena, run, size, large, zero);
return (run);
}
if (arena->spare != NULL) {
/* Use the spare. */
arena_chunk_t *chunk = arena->spare;
arena->spare = NULL;
run = (arena_run_t *)((uintptr_t)chunk +
(arena_chunk_header_npages << pagesize_2pow));
/* Insert the run into the runs_avail tree. */
arena_avail_tree_insert(&arena->runs_avail,
&chunk->map[arena_chunk_header_npages]);
arena_run_split(arena, run, size, large, zero);
return (run);
}
/*
* No usable runs. Create a new chunk from which to allocate
* the run.
*/
{
arena_chunk_t *chunk = (arena_chunk_t *)
chunk_alloc(chunksize, true, true);
if (chunk == NULL)
return (NULL);
arena_chunk_init(arena, chunk);
run = (arena_run_t *)((uintptr_t)chunk +
(arena_chunk_header_npages << pagesize_2pow));
}
/* Update page map. */
arena_run_split(arena, run, size, large, zero);
return (run);
}
static void
arena_purge(arena_t *arena, bool all)
{
arena_chunk_t *chunk;
size_t i, npages;
/* If all is set purge all dirty pages. */
size_t dirty_max = all ? 1 : opt_dirty_max;
#ifdef MALLOC_DEBUG
size_t ndirty = 0;
rb_foreach_begin(arena_chunk_t, link_dirty, &arena->chunks_dirty,
chunk) {
ndirty += chunk->ndirty;
} rb_foreach_end(arena_chunk_t, link_dirty, &arena->chunks_dirty, chunk)
assert(ndirty == arena->ndirty);
#endif
RELEASE_ASSERT(all || (arena->ndirty > opt_dirty_max));
#ifdef MALLOC_STATS
arena->stats.npurge++;
#endif
/*
* Iterate downward through chunks until enough dirty memory has been
* purged. Terminate as soon as possible in order to minimize the
* number of system calls, even if a chunk has only been partially
* purged.
*/
while (arena->ndirty > (dirty_max >> 1)) {
#ifdef MALLOC_DOUBLE_PURGE
bool madvised = false;
#endif
chunk = arena_chunk_tree_dirty_last(&arena->chunks_dirty);
RELEASE_ASSERT(chunk != NULL);
for (i = chunk_npages - 1; chunk->ndirty > 0; i--) {
RELEASE_ASSERT(i >= arena_chunk_header_npages);
if (chunk->map[i].bits & CHUNK_MAP_DIRTY) {
#ifdef MALLOC_DECOMMIT
const size_t free_operation = CHUNK_MAP_DECOMMITTED;
#else
const size_t free_operation = CHUNK_MAP_MADVISED;
#endif
assert((chunk->map[i].bits &
CHUNK_MAP_MADVISED_OR_DECOMMITTED) == 0);
chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY;
/* Find adjacent dirty run(s). */
for (npages = 1;
i > arena_chunk_header_npages &&
(chunk->map[i - 1].bits & CHUNK_MAP_DIRTY);
npages++) {
i--;
assert((chunk->map[i].bits &
CHUNK_MAP_MADVISED_OR_DECOMMITTED) == 0);
chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY;
}
chunk->ndirty -= npages;
arena->ndirty -= npages;
#ifdef MALLOC_DECOMMIT
pages_decommit((void *)((uintptr_t)
chunk + (i << pagesize_2pow)),
(npages << pagesize_2pow));
# ifdef MALLOC_STATS
arena->stats.ndecommit++;
arena->stats.decommitted += npages;
# endif
#endif
#ifdef MALLOC_STATS
arena->stats.committed -= npages;
#endif
#ifndef MALLOC_DECOMMIT
madvise((void *)((uintptr_t)chunk + (i <<
pagesize_2pow)), (npages << pagesize_2pow),
MADV_FREE);
# ifdef MALLOC_DOUBLE_PURGE
madvised = true;
# endif
#endif
#ifdef MALLOC_STATS
arena->stats.nmadvise++;
arena->stats.purged += npages;
#endif
if (arena->ndirty <= (dirty_max >> 1))
break;
}
}
if (chunk->ndirty == 0) {
arena_chunk_tree_dirty_remove(&arena->chunks_dirty,
chunk);
}
#ifdef MALLOC_DOUBLE_PURGE
if (madvised) {
/* The chunk might already be in the list, but this
* makes sure it's at the front. */
LinkedList_Remove(&chunk->chunks_madvised_elem);
LinkedList_InsertHead(&arena->chunks_madvised, &chunk->chunks_madvised_elem);
}
#endif
}
}
static void
arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty)
{
arena_chunk_t *chunk;
size_t size, run_ind, run_pages;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
run_ind = (size_t)(((uintptr_t)run - (uintptr_t)chunk)
>> pagesize_2pow);
RELEASE_ASSERT(run_ind >= arena_chunk_header_npages);
RELEASE_ASSERT(run_ind < chunk_npages);
if ((chunk->map[run_ind].bits & CHUNK_MAP_LARGE) != 0)
size = chunk->map[run_ind].bits & ~pagesize_mask;
else
size = run->bin->run_size;
run_pages = (size >> pagesize_2pow);
/* Mark pages as unallocated in the chunk map. */
if (dirty) {
size_t i;
for (i = 0; i < run_pages; i++) {
RELEASE_ASSERT((chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY)
== 0);
chunk->map[run_ind + i].bits = CHUNK_MAP_DIRTY;
}
if (chunk->ndirty == 0) {
arena_chunk_tree_dirty_insert(&arena->chunks_dirty,
chunk);
}
chunk->ndirty += run_pages;
arena->ndirty += run_pages;
} else {
size_t i;
for (i = 0; i < run_pages; i++) {
chunk->map[run_ind + i].bits &= ~(CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED);
}
}
chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits &
pagesize_mask);
chunk->map[run_ind+run_pages-1].bits = size |
(chunk->map[run_ind+run_pages-1].bits & pagesize_mask);
/* Try to coalesce forward. */
if (run_ind + run_pages < chunk_npages &&
(chunk->map[run_ind+run_pages].bits & CHUNK_MAP_ALLOCATED) == 0) {
size_t nrun_size = chunk->map[run_ind+run_pages].bits &
~pagesize_mask;
/*
* Remove successor from runs_avail; the coalesced run is
* inserted later.
*/
arena_avail_tree_remove(&arena->runs_avail,
&chunk->map[run_ind+run_pages]);
size += nrun_size;
run_pages = size >> pagesize_2pow;
RELEASE_ASSERT((chunk->map[run_ind+run_pages-1].bits & ~pagesize_mask)
== nrun_size);
chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits &
pagesize_mask);
chunk->map[run_ind+run_pages-1].bits = size |
(chunk->map[run_ind+run_pages-1].bits & pagesize_mask);
}
/* Try to coalesce backward. */
if (run_ind > arena_chunk_header_npages && (chunk->map[run_ind-1].bits &
CHUNK_MAP_ALLOCATED) == 0) {
size_t prun_size = chunk->map[run_ind-1].bits & ~pagesize_mask;
run_ind -= prun_size >> pagesize_2pow;
/*
* Remove predecessor from runs_avail; the coalesced run is
* inserted later.
*/
arena_avail_tree_remove(&arena->runs_avail,
&chunk->map[run_ind]);
size += prun_size;
run_pages = size >> pagesize_2pow;
RELEASE_ASSERT((chunk->map[run_ind].bits & ~pagesize_mask) ==
prun_size);
chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits &
pagesize_mask);
chunk->map[run_ind+run_pages-1].bits = size |
(chunk->map[run_ind+run_pages-1].bits & pagesize_mask);
}
/* Insert into runs_avail, now that coalescing is complete. */
arena_avail_tree_insert(&arena->runs_avail, &chunk->map[run_ind]);
/* Deallocate chunk if it is now completely unused. */
if ((chunk->map[arena_chunk_header_npages].bits & (~pagesize_mask |
CHUNK_MAP_ALLOCATED)) == arena_maxclass)
arena_chunk_dealloc(arena, chunk);
/* Enforce opt_dirty_max. */
if (arena->ndirty > opt_dirty_max)
arena_purge(arena, false);
}
static void
arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
size_t oldsize, size_t newsize)
{
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> pagesize_2pow;
size_t head_npages = (oldsize - newsize) >> pagesize_2pow;
assert(oldsize > newsize);
/*
* Update the chunk map so that arena_run_dalloc() can treat the
* leading run as separately allocated.
*/
chunk->map[pageind].bits = (oldsize - newsize) | CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED;
chunk->map[pageind+head_npages].bits = newsize | CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED;
arena_run_dalloc(arena, run, false);
}
static void
arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run,
size_t oldsize, size_t newsize, bool dirty)
{
size_t pageind = ((uintptr_t)run - (uintptr_t)chunk) >> pagesize_2pow;
size_t npages = newsize >> pagesize_2pow;
assert(oldsize > newsize);
/*
* Update the chunk map so that arena_run_dalloc() can treat the
* trailing run as separately allocated.
*/
chunk->map[pageind].bits = newsize | CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED;
chunk->map[pageind+npages].bits = (oldsize - newsize) | CHUNK_MAP_LARGE
| CHUNK_MAP_ALLOCATED;
arena_run_dalloc(arena, (arena_run_t *)((uintptr_t)run + newsize),
dirty);
}
static arena_run_t *
arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin)
{
arena_chunk_map_t *mapelm;
arena_run_t *run;
unsigned i, remainder;
/* Look for a usable run. */
mapelm = arena_run_tree_first(&bin->runs);
if (mapelm != NULL) {
/* run is guaranteed to have available space. */
arena_run_tree_remove(&bin->runs, mapelm);
run = (arena_run_t *)(mapelm->bits & ~pagesize_mask);
#ifdef MALLOC_STATS
bin->stats.reruns++;
#endif
return (run);
}
/* No existing runs have any space available. */
/* Allocate a new run. */
run = arena_run_alloc(arena, bin, bin->run_size, false, false);
if (run == NULL)
return (NULL);
/*
* Don't initialize if a race in arena_run_alloc() allowed an existing
* run to become usable.
*/
if (run == bin->runcur)
return (run);
VALGRIND_MALLOCLIKE_BLOCK(run, sizeof(arena_run_t) + (sizeof(unsigned) *
(bin->regs_mask_nelms - 1)), 0, false);
/* Initialize run internals. */
run->bin = bin;
for (i = 0; i < bin->regs_mask_nelms - 1; i++)
run->regs_mask[i] = UINT_MAX;
remainder = bin->nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1);
if (remainder == 0)
run->regs_mask[i] = UINT_MAX;
else {
/* The last element has spare bits that need to be unset. */
run->regs_mask[i] = (UINT_MAX >> ((1U << (SIZEOF_INT_2POW + 3))
- remainder));
}
run->regs_minelm = 0;
run->nfree = bin->nregs;
#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS)
run->magic = ARENA_RUN_MAGIC;
#endif
#ifdef MALLOC_STATS
bin->stats.nruns++;
bin->stats.curruns++;
if (bin->stats.curruns > bin->stats.highruns)
bin->stats.highruns = bin->stats.curruns;
#endif
return (run);
}
/* bin->runcur must have space available before this function is called. */
static inline void *
arena_bin_malloc_easy(arena_t *arena, arena_bin_t *bin, arena_run_t *run)
{
void *ret;
RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC);
RELEASE_ASSERT(run->nfree > 0);
ret = arena_run_reg_alloc(run, bin);
RELEASE_ASSERT(ret != NULL);
run->nfree--;
return (ret);
}
/* Re-fill bin->runcur, then call arena_bin_malloc_easy(). */
static void *
arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin)
{
bin->runcur = arena_bin_nonfull_run_get(arena, bin);
if (bin->runcur == NULL)
return (NULL);
RELEASE_ASSERT(bin->runcur->magic == ARENA_RUN_MAGIC);
RELEASE_ASSERT(bin->runcur->nfree > 0);
return (arena_bin_malloc_easy(arena, bin, bin->runcur));
}
/*
* Calculate bin->run_size such that it meets the following constraints:
*
* *) bin->run_size >= min_run_size
* *) bin->run_size <= arena_maxclass
* *) bin->run_size <= RUN_MAX_SMALL
* *) run header overhead <= RUN_MAX_OVRHD (or header overhead relaxed).
*
* bin->nregs, bin->regs_mask_nelms, and bin->reg0_offset are
* also calculated here, since these settings are all interdependent.
*/
static size_t
arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size)
{
size_t try_run_size, good_run_size;
unsigned good_nregs, good_mask_nelms, good_reg0_offset;
unsigned try_nregs, try_mask_nelms, try_reg0_offset;
assert(min_run_size >= pagesize);
assert(min_run_size <= arena_maxclass);
assert(min_run_size <= RUN_MAX_SMALL);
/*
* Calculate known-valid settings before entering the run_size
* expansion loop, so that the first part of the loop always copies
* valid settings.
*
* The do..while loop iteratively reduces the number of regions until
* the run header and the regions no longer overlap. A closed formula
* would be quite messy, since there is an interdependency between the
* header's mask length and the number of regions.
*/
try_run_size = min_run_size;
try_nregs = ((try_run_size - sizeof(arena_run_t)) / bin->reg_size)
+ 1; /* Counter-act try_nregs-- in loop. */
do {
try_nregs--;
try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) +
((try_nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1)) ? 1 : 0);
try_reg0_offset = try_run_size - (try_nregs * bin->reg_size);
} while (sizeof(arena_run_t) + (sizeof(unsigned) * (try_mask_nelms - 1))
> try_reg0_offset);
/* run_size expansion loop. */
do {
/*
* Copy valid settings before trying more aggressive settings.
*/
good_run_size = try_run_size;
good_nregs = try_nregs;
good_mask_nelms = try_mask_nelms;
good_reg0_offset = try_reg0_offset;
/* Try more aggressive settings. */
try_run_size += pagesize;
try_nregs = ((try_run_size - sizeof(arena_run_t)) /
bin->reg_size) + 1; /* Counter-act try_nregs-- in loop. */
do {
try_nregs--;
try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) +
((try_nregs & ((1U << (SIZEOF_INT_2POW + 3)) - 1)) ?
1 : 0);
try_reg0_offset = try_run_size - (try_nregs *
bin->reg_size);
} while (sizeof(arena_run_t) + (sizeof(unsigned) *
(try_mask_nelms - 1)) > try_reg0_offset);
} while (try_run_size <= arena_maxclass && try_run_size <= RUN_MAX_SMALL
&& RUN_MAX_OVRHD * (bin->reg_size << 3) > RUN_MAX_OVRHD_RELAX
&& (try_reg0_offset << RUN_BFP) > RUN_MAX_OVRHD * try_run_size);
assert(sizeof(arena_run_t) + (sizeof(unsigned) * (good_mask_nelms - 1))
<= good_reg0_offset);
assert((good_mask_nelms << (SIZEOF_INT_2POW + 3)) >= good_nregs);
/* Copy final settings. */
bin->run_size = good_run_size;
bin->nregs = good_nregs;
bin->regs_mask_nelms = good_mask_nelms;
bin->reg0_offset = good_reg0_offset;
return (good_run_size);
}
#ifdef MALLOC_BALANCE
static inline void
arena_lock_balance(arena_t *arena)
{
unsigned contention;
contention = malloc_spin_lock(&arena->lock);
if (narenas > 1) {
/*
* Calculate the exponentially averaged contention for this
* arena. Due to integer math always rounding down, this value
* decays somewhat faster then normal.
*/
arena->contention = (((uint64_t)arena->contention
* (uint64_t)((1U << BALANCE_ALPHA_INV_2POW)-1))
+ (uint64_t)contention) >> BALANCE_ALPHA_INV_2POW;
if (arena->contention >= opt_balance_threshold)
arena_lock_balance_hard(arena);
}
}
static void
arena_lock_balance_hard(arena_t *arena)
{
uint32_t ind;
arena->contention = 0;
#ifdef MALLOC_STATS
arena->stats.nbalance++;
#endif
ind = PRN(balance, narenas_2pow);
if (arenas[ind] != NULL) {
#ifdef MOZ_MEMORY_WINDOWS
TlsSetValue(tlsIndex, arenas[ind]);
#else
arenas_map = arenas[ind];
#endif
} else {
malloc_spin_lock(&arenas_lock);
if (arenas[ind] != NULL) {
#ifdef MOZ_MEMORY_WINDOWS
TlsSetValue(tlsIndex, arenas[ind]);
#else
arenas_map = arenas[ind];
#endif
} else {
#ifdef MOZ_MEMORY_WINDOWS
TlsSetValue(tlsIndex, arenas_extend(ind));
#else
arenas_map = arenas_extend(ind);
#endif
}
malloc_spin_unlock(&arenas_lock);
}
}
#endif
static inline void *
arena_malloc_small(arena_t *arena, size_t size, bool zero)
{
void *ret;
arena_bin_t *bin;
arena_run_t *run;
if (size < small_min) {
/* Tiny. */
size = pow2_ceil(size);
bin = &arena->bins[ffs((int)(size >> (TINY_MIN_2POW +
1)))];
#if (!defined(NDEBUG) || defined(MALLOC_STATS))
/*
* Bin calculation is always correct, but we may need
* to fix size for the purposes of assertions and/or
* stats accuracy.
*/
if (size < (1U << TINY_MIN_2POW))
size = (1U << TINY_MIN_2POW);
#endif
} else if (size <= small_max) {
/* Quantum-spaced. */
size = QUANTUM_CEILING(size);
bin = &arena->bins[ntbins + (size >> opt_quantum_2pow)
- 1];
} else {
/* Sub-page. */
size = pow2_ceil(size);
bin = &arena->bins[ntbins + nqbins
+ (ffs((int)(size >> opt_small_max_2pow)) - 2)];
}
RELEASE_ASSERT(size == bin->reg_size);
#ifdef MALLOC_BALANCE
arena_lock_balance(arena);
#else
malloc_spin_lock(&arena->lock);
#endif
if ((run = bin->runcur) != NULL && run->nfree > 0)
ret = arena_bin_malloc_easy(arena, bin, run);
else
ret = arena_bin_malloc_hard(arena, bin);
if (ret == NULL) {
malloc_spin_unlock(&arena->lock);
return (NULL);
}
#ifdef MALLOC_STATS
bin->stats.nrequests++;
arena->stats.nmalloc_small++;
arena->stats.allocated_small += size;
#endif
malloc_spin_unlock(&arena->lock);
VALGRIND_MALLOCLIKE_BLOCK(ret, size, 0, zero);
if (zero == false) {
#ifdef MALLOC_FILL
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
#endif
} else
memset(ret, 0, size);
#ifdef MOZ_TEMP_INVESTIGATION
if (size == 72) {
memset(ret, 0xe5, size);
}
#endif
return (ret);
}
static void *
arena_malloc_large(arena_t *arena, size_t size, bool zero)
{
void *ret;
/* Large allocation. */
size = PAGE_CEILING(size);
#ifdef MALLOC_BALANCE
arena_lock_balance(arena);
#else
malloc_spin_lock(&arena->lock);
#endif
ret = (void *)arena_run_alloc(arena, NULL, size, true, zero);
if (ret == NULL) {
malloc_spin_unlock(&arena->lock);
return (NULL);
}
#ifdef MALLOC_STATS
arena->stats.nmalloc_large++;
arena->stats.allocated_large += size;
#endif
malloc_spin_unlock(&arena->lock);
VALGRIND_MALLOCLIKE_BLOCK(ret, size, 0, zero);
if (zero == false) {
#ifdef MALLOC_FILL
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
#endif
}
return (ret);
}
static inline void *
arena_malloc(arena_t *arena, size_t size, bool zero)
{
assert(arena != NULL);
RELEASE_ASSERT(arena->magic == ARENA_MAGIC);
assert(size != 0);
assert(QUANTUM_CEILING(size) <= arena_maxclass);
if (size <= bin_maxclass) {
return (arena_malloc_small(arena, size, zero));
} else
return (arena_malloc_large(arena, size, zero));
}
static inline void *
imalloc(size_t size)
{
assert(size != 0);
if (size <= arena_maxclass)
return (arena_malloc(choose_arena(), size, false));
else
return (huge_malloc(size, false));
}
static inline void *
icalloc(size_t size)
{
if (size <= arena_maxclass)
return (arena_malloc(choose_arena(), size, true));
else
return (huge_malloc(size, true));
}
/* Only handles large allocations that require more than page alignment. */
static void *
arena_palloc(arena_t *arena, size_t alignment, size_t size, size_t alloc_size)
{
void *ret;
size_t offset;
arena_chunk_t *chunk;
assert((size & pagesize_mask) == 0);
assert((alignment & pagesize_mask) == 0);
#ifdef MALLOC_BALANCE
arena_lock_balance(arena);
#else
malloc_spin_lock(&arena->lock);
#endif
ret = (void *)arena_run_alloc(arena, NULL, alloc_size, true, false);
if (ret == NULL) {
malloc_spin_unlock(&arena->lock);
return (NULL);
}
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ret);
offset = (uintptr_t)ret & (alignment - 1);
assert((offset & pagesize_mask) == 0);
assert(offset < alloc_size);
if (offset == 0)
arena_run_trim_tail(arena, chunk, (arena_run_t*)ret, alloc_size, size, false);
else {
size_t leadsize, trailsize;
leadsize = alignment - offset;
if (leadsize > 0) {
arena_run_trim_head(arena, chunk, (arena_run_t*)ret, alloc_size,
alloc_size - leadsize);
ret = (void *)((uintptr_t)ret + leadsize);
}
trailsize = alloc_size - leadsize - size;
if (trailsize != 0) {
/* Trim trailing space. */
assert(trailsize < alloc_size);
arena_run_trim_tail(arena, chunk, (arena_run_t*)ret, size + trailsize,
size, false);
}
}
#ifdef MALLOC_STATS
arena->stats.nmalloc_large++;
arena->stats.allocated_large += size;
#endif
malloc_spin_unlock(&arena->lock);
VALGRIND_MALLOCLIKE_BLOCK(ret, size, 0, false);
#ifdef MALLOC_FILL
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
#endif
return (ret);
}
static inline void *
ipalloc(size_t alignment, size_t size)
{
void *ret;
size_t ceil_size;
/*
* Round size up to the nearest multiple of alignment.
*
* This done, we can take advantage of the fact that for each small
* size class, every object is aligned at the smallest power of two
* that is non-zero in the base two representation of the size. For
* example:
*
* Size | Base 2 | Minimum alignment
* -----+----------+------------------
* 96 | 1100000 | 32
* 144 | 10100000 | 32
* 192 | 11000000 | 64
*
* Depending on runtime settings, it is possible that arena_malloc()
* will further round up to a power of two, but that never causes
* correctness issues.
*/
ceil_size = (size + (alignment - 1)) & (-alignment);
/*
* (ceil_size < size) protects against the combination of maximal
* alignment and size greater than maximal alignment.
*/
if (ceil_size < size) {
/* size_t overflow. */
return (NULL);
}
if (ceil_size <= pagesize || (alignment <= pagesize
&& ceil_size <= arena_maxclass))
ret = arena_malloc(choose_arena(), ceil_size, false);
else {
size_t run_size;
/*
* We can't achieve sub-page alignment, so round up alignment
* permanently; it makes later calculations simpler.
*/
alignment = PAGE_CEILING(alignment);
ceil_size = PAGE_CEILING(size);
/*
* (ceil_size < size) protects against very large sizes within
* pagesize of SIZE_T_MAX.
*
* (ceil_size + alignment < ceil_size) protects against the
* combination of maximal alignment and ceil_size large enough
* to cause overflow. This is similar to the first overflow
* check above, but it needs to be repeated due to the new
* ceil_size value, which may now be *equal* to maximal
* alignment, whereas before we only detected overflow if the
* original size was *greater* than maximal alignment.
*/
if (ceil_size < size || ceil_size + alignment < ceil_size) {
/* size_t overflow. */
return (NULL);
}
/*
* Calculate the size of the over-size run that arena_palloc()
* would need to allocate in order to guarantee the alignment.
*/
if (ceil_size >= alignment)
run_size = ceil_size + alignment - pagesize;
else {
/*
* It is possible that (alignment << 1) will cause
* overflow, but it doesn't matter because we also
* subtract pagesize, which in the case of overflow
* leaves us with a very large run_size. That causes
* the first conditional below to fail, which means
* that the bogus run_size value never gets used for
* anything important.
*/
run_size = (alignment << 1) - pagesize;
}
if (run_size <= arena_maxclass) {
ret = arena_palloc(choose_arena(), alignment, ceil_size,
run_size);
} else if (alignment <= chunksize)
ret = huge_malloc(ceil_size, false);
else
ret = huge_palloc(alignment, ceil_size);
}
assert(((uintptr_t)ret & (alignment - 1)) == 0);
return (ret);
}
/* Return the size of the allocation pointed to by ptr. */
static size_t
arena_salloc(const void *ptr)
{
size_t ret;
arena_chunk_t *chunk;
size_t pageind, mapbits;
assert(ptr != NULL);
assert(CHUNK_ADDR2BASE(ptr) != ptr);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow);
mapbits = chunk->map[pageind].bits;
RELEASE_ASSERT((mapbits & CHUNK_MAP_ALLOCATED) != 0);
if ((mapbits & CHUNK_MAP_LARGE) == 0) {
arena_run_t *run = (arena_run_t *)(mapbits & ~pagesize_mask);
RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC);
ret = run->bin->reg_size;
} else {
ret = mapbits & ~pagesize_mask;
RELEASE_ASSERT(ret != 0);
}
return (ret);
}
#if (defined(MALLOC_VALIDATE) || defined(MOZ_MEMORY_DARWIN))
/*
* Validate ptr before assuming that it points to an allocation. Currently,
* the following validation is performed:
*
* + Check that ptr is not NULL.
*
* + Check that ptr lies within a mapped chunk.
*/
static inline size_t
isalloc_validate(const void *ptr)
{
arena_chunk_t *chunk;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
if (chunk == NULL)
return (0);
if (malloc_rtree_get(chunk_rtree, (uintptr_t)chunk) == NULL)
return (0);
if (chunk != ptr) {
RELEASE_ASSERT(chunk->arena->magic == ARENA_MAGIC);
return (arena_salloc(ptr));
} else {
size_t ret;
extent_node_t *node;
extent_node_t key;
/* Chunk. */
key.addr = (void *)chunk;
malloc_mutex_lock(&huge_mtx);
node = extent_tree_ad_search(&huge, &key);
if (node != NULL)
ret = node->size;
else
ret = 0;
malloc_mutex_unlock(&huge_mtx);
return (ret);
}
}
#endif
static inline size_t
isalloc(const void *ptr)
{
size_t ret;
arena_chunk_t *chunk;
assert(ptr != NULL);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
if (chunk != ptr) {
/* Region. */
assert(chunk->arena->magic == ARENA_MAGIC);
ret = arena_salloc(ptr);
} else {
extent_node_t *node, key;
/* Chunk (huge allocation). */
malloc_mutex_lock(&huge_mtx);
/* Extract from tree of huge allocations. */
key.addr = __DECONST(void *, ptr);
node = extent_tree_ad_search(&huge, &key);
RELEASE_ASSERT(node != NULL);
ret = node->size;
malloc_mutex_unlock(&huge_mtx);
}
return (ret);
}
static inline void
arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr,
arena_chunk_map_t *mapelm)
{
arena_run_t *run;
arena_bin_t *bin;
size_t size;
run = (arena_run_t *)(mapelm->bits & ~pagesize_mask);
RELEASE_ASSERT(run->magic == ARENA_RUN_MAGIC);
bin = run->bin;
size = bin->reg_size;
#ifdef MALLOC_FILL
if (opt_junk)
memset(ptr, 0x5a, size);
#endif
#ifdef MOZ_TEMP_INVESTIGATION
if (size == 72) {
memset(ptr, 0x75, size);
}
#endif
arena_run_reg_dalloc(run, bin, ptr, size);
run->nfree++;
if (run->nfree == bin->nregs) {
/* Deallocate run. */
if (run == bin->runcur)
bin->runcur = NULL;
else if (bin->nregs != 1) {
size_t run_pageind = (((uintptr_t)run -
(uintptr_t)chunk)) >> pagesize_2pow;
arena_chunk_map_t *run_mapelm =
&chunk->map[run_pageind];
/*
* This block's conditional is necessary because if the
* run only contains one region, then it never gets
* inserted into the non-full runs tree.
*/
RELEASE_ASSERT(arena_run_tree_search(&bin->runs, run_mapelm) ==
run_mapelm);
arena_run_tree_remove(&bin->runs, run_mapelm);
}
#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS)
run->magic = 0;
#endif
VALGRIND_FREELIKE_BLOCK(run, 0);
arena_run_dalloc(arena, run, true);
#ifdef MALLOC_STATS
bin->stats.curruns--;
#endif
} else if (run->nfree == 1 && run != bin->runcur) {
/*
* Make sure that bin->runcur always refers to the lowest
* non-full run, if one exists.
*/
if (bin->runcur == NULL)
bin->runcur = run;
else if ((uintptr_t)run < (uintptr_t)bin->runcur) {
/* Switch runcur. */
if (bin->runcur->nfree > 0) {
arena_chunk_t *runcur_chunk =
(arena_chunk_t*)CHUNK_ADDR2BASE(bin->runcur);
size_t runcur_pageind =
(((uintptr_t)bin->runcur -
(uintptr_t)runcur_chunk)) >> pagesize_2pow;
arena_chunk_map_t *runcur_mapelm =
&runcur_chunk->map[runcur_pageind];
/* Insert runcur. */
RELEASE_ASSERT(arena_run_tree_search(&bin->runs,
runcur_mapelm) == NULL);
arena_run_tree_insert(&bin->runs,
runcur_mapelm);
}
bin->runcur = run;
} else {
size_t run_pageind = (((uintptr_t)run -
(uintptr_t)chunk)) >> pagesize_2pow;
arena_chunk_map_t *run_mapelm =
&chunk->map[run_pageind];
RELEASE_ASSERT(arena_run_tree_search(&bin->runs, run_mapelm) ==
NULL);
arena_run_tree_insert(&bin->runs, run_mapelm);
}
}
#ifdef MALLOC_STATS
arena->stats.allocated_small -= size;
arena->stats.ndalloc_small++;
#endif
}
static void
arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, void *ptr)
{
/* Large allocation. */
malloc_spin_lock(&arena->lock);
#ifdef MALLOC_FILL
#ifndef MALLOC_STATS
if (opt_junk)
#endif
#endif
{
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >>
pagesize_2pow;
size_t size = chunk->map[pageind].bits & ~pagesize_mask;
#ifdef MALLOC_FILL
#ifdef MALLOC_STATS
if (opt_junk)
#endif
memset(ptr, 0x5a, size);
#endif
#ifdef MALLOC_STATS
arena->stats.allocated_large -= size;
#endif
}
#ifdef MALLOC_STATS
arena->stats.ndalloc_large++;
#endif
arena_run_dalloc(arena, (arena_run_t *)ptr, true);
malloc_spin_unlock(&arena->lock);
}
static inline void
arena_dalloc(void *ptr, size_t offset)
{
arena_chunk_t *chunk;
arena_t *arena;
size_t pageind;
arena_chunk_map_t *mapelm;
assert(ptr != NULL);
assert(offset != 0);
assert(CHUNK_ADDR2OFFSET(ptr) == offset);
chunk = (arena_chunk_t *) ((uintptr_t)ptr - offset);
arena = chunk->arena;
assert(arena != NULL);
RELEASE_ASSERT(arena->magic == ARENA_MAGIC);
pageind = offset >> pagesize_2pow;
mapelm = &chunk->map[pageind];
RELEASE_ASSERT((mapelm->bits & CHUNK_MAP_ALLOCATED) != 0);
if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) {
/* Small allocation. */
malloc_spin_lock(&arena->lock);
arena_dalloc_small(arena, chunk, ptr, mapelm);
malloc_spin_unlock(&arena->lock);
} else
arena_dalloc_large(arena, chunk, ptr);
VALGRIND_FREELIKE_BLOCK(ptr, 0);
}
static inline void
idalloc(void *ptr)
{
size_t offset;
assert(ptr != NULL);
offset = CHUNK_ADDR2OFFSET(ptr);
if (offset != 0)
arena_dalloc(ptr, offset);
else
huge_dalloc(ptr);
}
static void
arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t size, size_t oldsize)
{
assert(size < oldsize);
/*
* Shrink the run, and make trailing pages available for other
* allocations.
*/
#ifdef MALLOC_BALANCE
arena_lock_balance(arena);
#else
malloc_spin_lock(&arena->lock);
#endif
arena_run_trim_tail(arena, chunk, (arena_run_t *)ptr, oldsize, size,
true);
#ifdef MALLOC_STATS
arena->stats.allocated_large -= oldsize - size;
#endif
malloc_spin_unlock(&arena->lock);
}
static bool
arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr,
size_t size, size_t oldsize)
{
size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow;
size_t npages = oldsize >> pagesize_2pow;
RELEASE_ASSERT(oldsize == (chunk->map[pageind].bits & ~pagesize_mask));
/* Try to extend the run. */
assert(size > oldsize);
#ifdef MALLOC_BALANCE
arena_lock_balance(arena);
#else
malloc_spin_lock(&arena->lock);
#endif
if (pageind + npages < chunk_npages && (chunk->map[pageind+npages].bits
& CHUNK_MAP_ALLOCATED) == 0 && (chunk->map[pageind+npages].bits &
~pagesize_mask) >= size - oldsize) {
/*
* The next run is available and sufficiently large. Split the
* following run, then merge the first part with the existing
* allocation.
*/
arena_run_split(arena, (arena_run_t *)((uintptr_t)chunk +
((pageind+npages) << pagesize_2pow)), size - oldsize, true,
false);
chunk->map[pageind].bits = size | CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED;
chunk->map[pageind+npages].bits = CHUNK_MAP_LARGE |
CHUNK_MAP_ALLOCATED;
#ifdef MALLOC_STATS
arena->stats.allocated_large += size - oldsize;
#endif
malloc_spin_unlock(&arena->lock);
return (false);
}
malloc_spin_unlock(&arena->lock);
return (true);
}
/*
* Try to resize a large allocation, in order to avoid copying. This will
* always fail if growing an object, and the following run is already in use.
*/
static bool
arena_ralloc_large(void *ptr, size_t size, size_t oldsize)
{
size_t psize;
psize = PAGE_CEILING(size);
if (psize == oldsize) {
/* Same size class. */
#ifdef MALLOC_FILL
if (opt_junk && size < oldsize) {
memset((void *)((uintptr_t)ptr + size), 0x5a, oldsize -
size);
}
#endif
return (false);
} else {
arena_chunk_t *chunk;
arena_t *arena;
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
arena = chunk->arena;
RELEASE_ASSERT(arena->magic == ARENA_MAGIC);
if (psize < oldsize) {
#ifdef MALLOC_FILL
/* Fill before shrinking in order avoid a race. */
if (opt_junk) {
memset((void *)((uintptr_t)ptr + size), 0x5a,
oldsize - size);
}
#endif
arena_ralloc_large_shrink(arena, chunk, ptr, psize,
oldsize);
return (false);
} else {
bool ret = arena_ralloc_large_grow(arena, chunk, ptr,
psize, oldsize);
#ifdef MALLOC_FILL
if (ret == false && opt_zero) {
memset((void *)((uintptr_t)ptr + oldsize), 0,
size - oldsize);
}
#endif
return (ret);
}
}
}
static void *
arena_ralloc(void *ptr, size_t size, size_t oldsize)
{
void *ret;
size_t copysize;
/* Try to avoid moving the allocation. */
if (size < small_min) {
if (oldsize < small_min &&
ffs((int)(pow2_ceil(size) >> (TINY_MIN_2POW + 1)))
== ffs((int)(pow2_ceil(oldsize) >> (TINY_MIN_2POW + 1))))
goto IN_PLACE; /* Same size class. */
} else if (size <= small_max) {
if (oldsize >= small_min && oldsize <= small_max &&
(QUANTUM_CEILING(size) >> opt_quantum_2pow)
== (QUANTUM_CEILING(oldsize) >> opt_quantum_2pow))
goto IN_PLACE; /* Same size class. */
} else if (size <= bin_maxclass) {
if (oldsize > small_max && oldsize <= bin_maxclass &&
pow2_ceil(size) == pow2_ceil(oldsize))
goto IN_PLACE; /* Same size class. */
} else if (oldsize > bin_maxclass && oldsize <= arena_maxclass) {
assert(size > bin_maxclass);
if (arena_ralloc_large(ptr, size, oldsize) == false)
return (ptr);
}
/*
* If we get here, then size and oldsize are different enough that we
* need to move the object. In that case, fall back to allocating new
* space and copying.
*/
ret = arena_malloc(choose_arena(), size, false);
if (ret == NULL)
return (NULL);
/* Junk/zero-filling were already done by arena_malloc(). */
copysize = (size < oldsize) ? size : oldsize;
#ifdef VM_COPY_MIN
if (copysize >= VM_COPY_MIN)
pages_copy(ret, ptr, copysize);
else
#endif
memcpy(ret, ptr, copysize);
idalloc(ptr);
return (ret);
IN_PLACE:
#ifdef MALLOC_FILL
if (opt_junk && size < oldsize)
memset((void *)((uintptr_t)ptr + size), 0x5a, oldsize - size);
else if (opt_zero && size > oldsize)
memset((void *)((uintptr_t)ptr + oldsize), 0, size - oldsize);
#endif
return (ptr);
}
static inline void *
iralloc(void *ptr, size_t size)
{
size_t oldsize;
assert(ptr != NULL);
assert(size != 0);
oldsize = isalloc(ptr);
#ifndef MALLOC_VALGRIND
if (size <= arena_maxclass)
return (arena_ralloc(ptr, size, oldsize));
else
return (huge_ralloc(ptr, size, oldsize));
#else
/*
* Valgrind does not provide a public interface for modifying an
* existing allocation, so use malloc/memcpy/free instead.
*/
{
void *ret = imalloc(size);
if (ret != NULL) {
if (oldsize < size)
memcpy(ret, ptr, oldsize);
else
memcpy(ret, ptr, size);
idalloc(ptr);
}
return (ret);
}
#endif
}
static bool
arena_new(arena_t *arena)
{
unsigned i;
arena_bin_t *bin;
size_t pow2_size, prev_run_size;
if (malloc_spin_init(&arena->lock))
return (true);
#ifdef MALLOC_STATS
memset(&arena->stats, 0, sizeof(arena_stats_t));
#endif
/* Initialize chunks. */
arena_chunk_tree_dirty_new(&arena->chunks_dirty);
#ifdef MALLOC_DOUBLE_PURGE
LinkedList_Init(&arena->chunks_madvised);
#endif
arena->spare = NULL;
arena->ndirty = 0;
arena_avail_tree_new(&arena->runs_avail);
#ifdef MALLOC_BALANCE
arena->contention = 0;
#endif
/* Initialize bins. */
prev_run_size = pagesize;
/* (2^n)-spaced tiny bins. */
for (i = 0; i < ntbins; i++) {
bin = &arena->bins[i];
bin->runcur = NULL;
arena_run_tree_new(&bin->runs);
bin->reg_size = (1U << (TINY_MIN_2POW + i));
prev_run_size = arena_bin_run_size_calc(bin, prev_run_size);
#ifdef MALLOC_STATS
memset(&bin->stats, 0, sizeof(malloc_bin_stats_t));
#endif
}
/* Quantum-spaced bins. */
for (; i < ntbins + nqbins; i++) {
bin = &arena->bins[i];
bin->runcur = NULL;
arena_run_tree_new(&bin->runs);
bin->reg_size = quantum * (i - ntbins + 1);
pow2_size = pow2_ceil(quantum * (i - ntbins + 1));
prev_run_size = arena_bin_run_size_calc(bin, prev_run_size);
#ifdef MALLOC_STATS
memset(&bin->stats, 0, sizeof(malloc_bin_stats_t));
#endif
}
/* (2^n)-spaced sub-page bins. */
for (; i < ntbins + nqbins + nsbins; i++) {
bin = &arena->bins[i];
bin->runcur = NULL;
arena_run_tree_new(&bin->runs);
bin->reg_size = (small_max << (i - (ntbins + nqbins) + 1));
prev_run_size = arena_bin_run_size_calc(bin, prev_run_size);
#ifdef MALLOC_STATS
memset(&bin->stats, 0, sizeof(malloc_bin_stats_t));
#endif
}
#if defined(MALLOC_DEBUG) || defined(MOZ_JEMALLOC_HARD_ASSERTS)
arena->magic = ARENA_MAGIC;
#endif
return (false);
}
/* Create a new arena and insert it into the arenas array at index ind. */
static arena_t *
arenas_extend(unsigned ind)
{
arena_t *ret;
/* Allocate enough space for trailing bins. */
ret = (arena_t *)base_alloc(sizeof(arena_t)
+ (sizeof(arena_bin_t) * (ntbins + nqbins + nsbins - 1)));
if (ret != NULL && arena_new(ret) == false) {
arenas[ind] = ret;
return (ret);
}
/* Only reached if there is an OOM error. */
/*
* OOM here is quite inconvenient to propagate, since dealing with it
* would require a check for failure in the fast path. Instead, punt
* by using arenas[0]. In practice, this is an extremely unlikely
* failure.
*/
_malloc_message(_getprogname(),
": (malloc) Error initializing arena\n", "", "");
if (opt_abort)
abort();
return (arenas[0]);
}
/*
* End arena.
*/
/******************************************************************************/
/*
* Begin general internal functions.
*/
static void *
huge_malloc(size_t size, bool zero)
{
void *ret;
size_t csize;
size_t psize;
extent_node_t *node;
/* Allocate one or more contiguous chunks for this request. */
csize = CHUNK_CEILING(size);
if (csize == 0) {
/* size is large enough to cause size_t wrap-around. */
return (NULL);
}
/* Allocate an extent node with which to track the chunk. */
node = base_node_alloc();
if (node == NULL)
return (NULL);
ret = chunk_alloc(csize, zero, true);
if (ret == NULL) {
base_node_dealloc(node);
return (NULL);
}
/* Insert node into huge. */
node->addr = ret;
psize = PAGE_CEILING(size);
node->size = psize;
malloc_mutex_lock(&huge_mtx);
extent_tree_ad_insert(&huge, node);
#ifdef MALLOC_STATS
huge_nmalloc++;
/* Although we allocated space for csize bytes, we indicate that we've
* allocated only psize bytes.
*
* If DECOMMIT is defined, this is a reasonable thing to do, since
* we'll explicitly decommit the bytes in excess of psize.
*
* If DECOMMIT is not defined, then we're relying on the OS to be lazy
* about how it allocates physical pages to mappings. If we never
* touch the pages in excess of psize, the OS won't allocate a physical
* page, and we won't use more than psize bytes of physical memory.
*
* A correct program will only touch memory in excess of how much it
* requested if it first calls malloc_usable_size and finds out how
* much space it has to play with. But because we set node->size =
* psize above, malloc_usable_size will return psize, not csize, and
* the program will (hopefully) never touch bytes in excess of psize.
* Thus those bytes won't take up space in physical memory, and we can
* reasonably claim we never "allocated" them in the first place. */
huge_allocated += psize;
huge_mapped += csize;
#endif
malloc_mutex_unlock(&huge_mtx);
#ifdef MALLOC_DECOMMIT
if (csize - psize > 0)
pages_decommit((void *)((uintptr_t)ret + psize), csize - psize);
#endif
#ifdef MALLOC_DECOMMIT
VALGRIND_MALLOCLIKE_BLOCK(ret, psize, 0, zero);
#else
VALGRIND_MALLOCLIKE_BLOCK(ret, csize, 0, zero);
#endif
#ifdef MALLOC_FILL
if (zero == false) {
if (opt_junk)
# ifdef MALLOC_DECOMMIT
memset(ret, 0xa5, psize);
# else
memset(ret, 0xa5, csize);
# endif
else if (opt_zero)
# ifdef MALLOC_DECOMMIT
memset(ret, 0, psize);
# else
memset(ret, 0, csize);
# endif
}
#endif
return (ret);
}
/* Only handles large allocations that require more than chunk alignment. */
static void *
huge_palloc(size_t alignment, size_t size)
{
void *ret;
size_t alloc_size, chunk_size, offset;
size_t psize;
extent_node_t *node;
int pfd;
/*
* This allocation requires alignment that is even larger than chunk
* alignment. This means that huge_malloc() isn't good enough.
*
* Allocate almost twice as many chunks as are demanded by the size or
* alignment, in order to assure the alignment can be achieved, then
* unmap leading and trailing chunks.
*/
assert(alignment >= chunksize);
chunk_size = CHUNK_CEILING(size);
if (size >= alignment)
alloc_size = chunk_size + alignment - chunksize;
else
alloc_size = (alignment << 1) - chunksize;
/* Allocate an extent node with which to track the chunk. */
node = base_node_alloc();
if (node == NULL)
return (NULL);
/*
* Windows requires that there be a 1:1 mapping between VM
* allocation/deallocation operations. Therefore, take care here to
* acquire the final result via one mapping operation.
*
* The MALLOC_PAGEFILE code also benefits from this mapping algorithm,
* since it reduces the number of page files.
*/
#ifdef MALLOC_PAGEFILE
if (opt_pagefile) {
pfd = pagefile_init(size);
if (pfd == -1)
return (NULL);
} else
#endif
pfd = -1;
#ifdef JEMALLOC_USES_MAP_ALIGN
ret = pages_map_align(chunk_size, pfd, alignment);
#else
do {
void *over;
over = chunk_alloc(alloc_size, false, false);
if (over == NULL) {
base_node_dealloc(node);
ret = NULL;
goto RETURN;
}
offset = (uintptr_t)over & (alignment - 1);
assert((offset & chunksize_mask) == 0);
assert(offset < alloc_size);
ret = (void *)((uintptr_t)over + offset);
chunk_dealloc(over, alloc_size);
ret = pages_map(ret, chunk_size, pfd);
/*
* Failure here indicates a race with another thread, so try
* again.
*/
} while (ret == NULL);
#endif
/* Insert node into huge. */
node->addr = ret;
psize = PAGE_CEILING(size);
node->size = psize;
malloc_mutex_lock(&huge_mtx);
extent_tree_ad_insert(&huge, node);
#ifdef MALLOC_STATS
huge_nmalloc++;
/* See note in huge_alloc() for why huge_allocated += psize is correct
* here even when DECOMMIT is not defined. */
huge_allocated += psize;
huge_mapped += chunk_size;
#endif
malloc_mutex_unlock(&huge_mtx);
#ifdef MALLOC_DECOMMIT
if (chunk_size - psize > 0) {
pages_decommit((void *)((uintptr_t)ret + psize),
chunk_size - psize);
}
#endif
#ifdef MALLOC_DECOMMIT
VALGRIND_MALLOCLIKE_BLOCK(ret, psize, 0, false);
#else
VALGRIND_MALLOCLIKE_BLOCK(ret, chunk_size, 0, false);
#endif
#ifdef MALLOC_FILL
if (opt_junk)
# ifdef MALLOC_DECOMMIT
memset(ret, 0xa5, psize);
# else
memset(ret, 0xa5, chunk_size);
# endif
else if (opt_zero)
# ifdef MALLOC_DECOMMIT
memset(ret, 0, psize);
# else
memset(ret, 0, chunk_size);
# endif
#endif
RETURN:
#ifdef MALLOC_PAGEFILE
if (pfd != -1)
pagefile_close(pfd);
#endif
return (ret);
}
static void *
huge_ralloc(void *ptr, size_t size, size_t oldsize)
{
void *ret;
size_t copysize;
/* Avoid moving the allocation if the size class would not change. */
if (oldsize > arena_maxclass &&
CHUNK_CEILING(size) == CHUNK_CEILING(oldsize)) {
size_t psize = PAGE_CEILING(size);
#ifdef MALLOC_FILL
if (opt_junk && size < oldsize) {
memset((void *)((uintptr_t)ptr + size), 0x5a, oldsize
- size);
}
#endif
#ifdef MALLOC_DECOMMIT
if (psize < oldsize) {
extent_node_t *node, key;
pages_decommit((void *)((uintptr_t)ptr + psize),
oldsize - psize);
/* Update recorded size. */
malloc_mutex_lock(&huge_mtx);
key.addr = __DECONST(void *, ptr);
node = extent_tree_ad_search(&huge, &key);
assert(node != NULL);
assert(node->size == oldsize);
# ifdef MALLOC_STATS
huge_allocated -= oldsize - psize;
/* No need to change huge_mapped, because we didn't
* (un)map anything. */
# endif
node->size = psize;
malloc_mutex_unlock(&huge_mtx);
} else if (psize > oldsize) {
pages_commit((void *)((uintptr_t)ptr + oldsize),
psize - oldsize);
}
#endif
/* Although we don't have to commit or decommit anything if
* DECOMMIT is not defined and the size class didn't change, we
* do need to update the recorded size if the size increased,
* so malloc_usable_size doesn't return a value smaller than
* what was requested via realloc(). */
if (psize > oldsize) {
/* Update recorded size. */
extent_node_t *node, key;
malloc_mutex_lock(&huge_mtx);
key.addr = __DECONST(void *, ptr);
node = extent_tree_ad_search(&huge, &key);
assert(node != NULL);
assert(node->size == oldsize);
# ifdef MALLOC_STATS
huge_allocated += psize - oldsize;
/* No need to change huge_mapped, because we didn't
* (un)map anything. */
# endif
node->size = psize;
malloc_mutex_unlock(&huge_mtx);
}
#ifdef MALLOC_FILL
if (opt_zero && size > oldsize) {
memset((void *)((uintptr_t)ptr + oldsize), 0, size
- oldsize);
}
#endif
return (ptr);
}
/*
* If we get here, then size and oldsize are different enough that we
* need to use a different size class. In that case, fall back to
* allocating new space and copying.
*/
ret = huge_malloc(size, false);
if (ret == NULL)
return (NULL);
copysize = (size < oldsize) ? size : oldsize;
#ifdef VM_COPY_MIN
if (copysize >= VM_COPY_MIN)
pages_copy(ret, ptr, copysize);
else
#endif
memcpy(ret, ptr, copysize);
idalloc(ptr);
return (ret);
}
static void
huge_dalloc(void *ptr)
{
extent_node_t *node, key;
malloc_mutex_lock(&huge_mtx);
/* Extract from tree of huge allocations. */
key.addr = ptr;
node = extent_tree_ad_search(&huge, &key);
assert(node != NULL);
assert(node->addr == ptr);
extent_tree_ad_remove(&huge, node);
#ifdef MALLOC_STATS
huge_ndalloc++;
huge_allocated -= node->size;
huge_mapped -= CHUNK_CEILING(node->size);
#endif
malloc_mutex_unlock(&huge_mtx);
/* Unmap chunk. */
#ifdef MALLOC_FILL
if (opt_junk)
memset(node->addr, 0x5a, node->size);
#endif
chunk_dealloc(node->addr, CHUNK_CEILING(node->size));
VALGRIND_FREELIKE_BLOCK(node->addr, 0);
base_node_dealloc(node);
}
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
#ifdef MOZ_MEMORY_BSD
static inline unsigned
malloc_ncpus(void)
{
unsigned ret;
int mib[2];
size_t len;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
len = sizeof(ret);
if (sysctl(mib, 2, &ret, &len, (void *) 0, 0) == -1) {
/* Error. */
return (1);
}
return (ret);
}
#elif (defined(MOZ_MEMORY_LINUX))
#include <fcntl.h>
static inline unsigned
malloc_ncpus(void)
{
unsigned ret;
int fd, nread, column;
char buf[1024];
static const char matchstr[] = "processor\t:";
int i;
/*
* sysconf(3) would be the preferred method for determining the number
* of CPUs, but it uses malloc internally, which causes untennable
* recursion during malloc initialization.
*/
fd = open("/proc/cpuinfo", O_RDONLY);
if (fd == -1)
return (1); /* Error. */
/*
* Count the number of occurrences of matchstr at the beginnings of
* lines. This treats hyperthreaded CPUs as multiple processors.
*/
column = 0;
ret = 0;
while (true) {
nread = read(fd, &buf, sizeof(buf));
if (nread <= 0)
break; /* EOF or error. */
for (i = 0;i < nread;i++) {
char c = buf[i];
if (c == '\n')
column = 0;
else if (column != -1) {
if (c == matchstr[column]) {
column++;
if (column == sizeof(matchstr) - 1) {
column = -1;
ret++;
}
} else
column = -1;
}
}
}
if (ret == 0)
ret = 1; /* Something went wrong in the parser. */
close(fd);
return (ret);
}
#elif (defined(MOZ_MEMORY_DARWIN))
#include <mach/mach_init.h>
#include <mach/mach_host.h>
static inline unsigned
malloc_ncpus(void)
{
kern_return_t error;
natural_t n;
processor_info_array_t pinfo;
mach_msg_type_number_t pinfocnt;
error = host_processor_info(mach_host_self(), PROCESSOR_BASIC_INFO,
&n, &pinfo, &pinfocnt);
if (error != KERN_SUCCESS)
return (1); /* Error. */
else
return (n);
}
#elif (defined(MOZ_MEMORY_SOLARIS))
static inline unsigned
malloc_ncpus(void)
{
return sysconf(_SC_NPROCESSORS_ONLN);
}
#else
static inline unsigned
malloc_ncpus(void)
{
/*
* We lack a way to determine the number of CPUs on this platform, so
* assume 1 CPU.
*/
return (1);
}
#endif
#endif
static void
malloc_print_stats(void)
{
if (opt_print_stats) {
char s[UMAX2S_BUFSIZE];
_malloc_message("___ Begin malloc statistics ___\n", "", "",
"");
_malloc_message("Assertions ",
#ifdef NDEBUG
"disabled",
#else
"enabled",
#endif
"\n", "");
_malloc_message("Boolean MALLOC_OPTIONS: ",
opt_abort ? "A" : "a", "", "");
#ifdef MALLOC_FILL
_malloc_message(opt_junk ? "J" : "j", "", "", "");
#endif
#ifdef MALLOC_PAGEFILE
_malloc_message(opt_pagefile ? "o" : "O", "", "", "");
#endif
_malloc_message("P", "", "", "");
#ifdef MALLOC_UTRACE
_malloc_message(opt_utrace ? "U" : "u", "", "", "");
#endif
#ifdef MALLOC_SYSV
_malloc_message(opt_sysv ? "V" : "v", "", "", "");
#endif
#ifdef MALLOC_XMALLOC
_malloc_message(opt_xmalloc ? "X" : "x", "", "", "");
#endif
#ifdef MALLOC_FILL
_malloc_message(opt_zero ? "Z" : "z", "", "", "");
#endif
_malloc_message("\n", "", "", "");
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
_malloc_message("CPUs: ", umax2s(ncpus, 10, s), "\n", "");
#endif
_malloc_message("Max arenas: ", umax2s(narenas, 10, s), "\n",
"");
#ifdef MALLOC_BALANCE
_malloc_message("Arena balance threshold: ",
umax2s(opt_balance_threshold, 10, s), "\n", "");
#endif
_malloc_message("Pointer size: ", umax2s(sizeof(void *), 10, s),
"\n", "");
_malloc_message("Quantum size: ", umax2s(quantum, 10, s), "\n",
"");
_malloc_message("Max small size: ", umax2s(small_max, 10, s),
"\n", "");
_malloc_message("Max dirty pages per arena: ",
umax2s(opt_dirty_max, 10, s), "\n", "");
_malloc_message("Chunk size: ", umax2s(chunksize, 10, s), "",
"");
_malloc_message(" (2^", umax2s(opt_chunk_2pow, 10, s), ")\n",
"");
#ifdef MALLOC_STATS
{
size_t allocated, mapped;
#ifdef MALLOC_BALANCE
uint64_t nbalance = 0;
#endif
unsigned i;
arena_t *arena;
/* Calculate and print allocated/mapped stats. */
/* arenas. */
for (i = 0, allocated = 0; i < narenas; i++) {
if (arenas[i] != NULL) {
malloc_spin_lock(&arenas[i]->lock);
allocated +=
arenas[i]->stats.allocated_small;
allocated +=
arenas[i]->stats.allocated_large;
mapped += arenas[i]->stats.mapped;
#ifdef MALLOC_BALANCE
nbalance += arenas[i]->stats.nbalance;
#endif
malloc_spin_unlock(&arenas[i]->lock);
}
}
/* huge/base. */
malloc_mutex_lock(&huge_mtx);
allocated += huge_allocated;
mapped += huge_mapped;
malloc_mutex_unlock(&huge_mtx);
malloc_mutex_lock(&base_mtx);
mapped += base_mapped;
malloc_mutex_unlock(&base_mtx);
#ifdef MOZ_MEMORY_WINDOWS
malloc_printf("Allocated: %lu, mapped: %lu\n",
allocated, mapped);
#else
malloc_printf("Allocated: %zu, mapped: %zu\n",
allocated, mapped);
#endif
#ifdef MALLOC_BALANCE
malloc_printf("Arena balance reassignments: %llu\n",
nbalance);
#endif
/* Print chunk stats. */
malloc_printf(
"huge: nmalloc ndalloc allocated\n");
#ifdef MOZ_MEMORY_WINDOWS
malloc_printf(" %12llu %12llu %12lu\n",
huge_nmalloc, huge_ndalloc, huge_allocated);
#else
malloc_printf(" %12llu %12llu %12zu\n",
huge_nmalloc, huge_ndalloc, huge_allocated);
#endif
/* Print stats for each arena. */
for (i = 0; i < narenas; i++) {
arena = arenas[i];
if (arena != NULL) {
malloc_printf(
"\narenas[%u]:\n", i);
malloc_spin_lock(&arena->lock);
stats_print(arena);
malloc_spin_unlock(&arena->lock);
}
}
}
#endif /* #ifdef MALLOC_STATS */
_malloc_message("--- End malloc statistics ---\n", "", "", "");
}
}
/*
* FreeBSD's pthreads implementation calls malloc(3), so the malloc
* implementation has to take pains to avoid infinite recursion during
* initialization.
*/
#if (defined(MOZ_MEMORY_WINDOWS) || defined(MOZ_MEMORY_DARWIN))
#define malloc_init() false
#else
static inline bool
malloc_init(void)
{
if (malloc_initialized == false)
return (malloc_init_hard());
return (false);
}
#endif
#if !defined(MOZ_MEMORY_WINDOWS)
static
#endif
bool
malloc_init_hard(void)
{
unsigned i;
char buf[PATH_MAX + 1];
const char *opts;
long result;
#ifndef MOZ_MEMORY_WINDOWS
int linklen;
#endif
#ifdef MOZ_MEMORY_DARWIN
malloc_zone_t* default_zone;
#endif
#ifndef MOZ_MEMORY_WINDOWS
malloc_mutex_lock(&init_lock);
#endif
if (malloc_initialized) {
/*
* Another thread initialized the allocator before this one
* acquired init_lock.
*/
#ifndef MOZ_MEMORY_WINDOWS
malloc_mutex_unlock(&init_lock);
#endif
return (false);
}
#ifdef MOZ_MEMORY_WINDOWS
/* get a thread local storage index */
tlsIndex = TlsAlloc();
#endif
/* Get page size and number of CPUs */
#ifdef MOZ_MEMORY_WINDOWS
{
SYSTEM_INFO info;
GetSystemInfo(&info);
result = info.dwPageSize;
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
ncpus = info.dwNumberOfProcessors;
#endif
}
#else
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
ncpus = malloc_ncpus();
#endif
result = sysconf(_SC_PAGESIZE);
assert(result != -1);
#endif
/* We assume that the page size is a power of 2. */
assert(((result - 1) & result) == 0);
#ifdef MALLOC_STATIC_SIZES
if (pagesize % (size_t) result) {
_malloc_message(_getprogname(),
"Compile-time page size does not divide the runtime one.\n",
"", "");
abort();
}
#else
pagesize = (size_t) result;
pagesize_mask = (size_t) result - 1;
pagesize_2pow = ffs((int)result) - 1;
#endif
#ifdef MALLOC_PAGEFILE
/*
* Determine where to create page files. It is insufficient to
* unconditionally use P_tmpdir (typically "/tmp"), since for some
* operating systems /tmp is a separate filesystem that is rather small.
* Therefore prefer, in order, the following locations:
*
* 1) MALLOC_TMPDIR
* 2) TMPDIR
* 3) P_tmpdir
*/
{
char *s;
size_t slen;
static const char suffix[] = "/jemalloc.XXXXXX";
if ((s = getenv("MALLOC_TMPDIR")) == NULL && (s =
getenv("TMPDIR")) == NULL)
s = P_tmpdir;
slen = strlen(s);
if (slen + sizeof(suffix) > sizeof(pagefile_templ)) {
_malloc_message(_getprogname(),
": (malloc) Page file path too long\n",
"", "");
abort();
}
memcpy(pagefile_templ, s, slen);
memcpy(&pagefile_templ[slen], suffix, sizeof(suffix));
}
#endif
for (i = 0; i < 3; i++) {
unsigned j;
/* Get runtime configuration. */
switch (i) {
case 0:
#ifndef MOZ_MEMORY_WINDOWS
if ((linklen = readlink("/etc/malloc.conf", buf,
sizeof(buf) - 1)) != -1) {
/*
* Use the contents of the "/etc/malloc.conf"
* symbolic link's name.
*/
buf[linklen] = '\0';
opts = buf;
} else
#endif
{
/* No configuration specified. */
buf[0] = '\0';
opts = buf;
}
break;
case 1:
if (issetugid() == 0 && (opts =
getenv("MALLOC_OPTIONS")) != NULL) {
/*
* Do nothing; opts is already initialized to
* the value of the MALLOC_OPTIONS environment
* variable.
*/
} else {
/* No configuration specified. */
buf[0] = '\0';
opts = buf;
}
break;
case 2:
if (_malloc_options != NULL) {
/*
* Use options that were compiled into the
* program.
*/
opts = _malloc_options;
} else {
/* No configuration specified. */
buf[0] = '\0';
opts = buf;
}
break;
default:
/* NOTREACHED */
buf[0] = '\0';
opts = buf;
assert(false);
}
for (j = 0; opts[j] != '\0'; j++) {
unsigned k, nreps;
bool nseen;
/* Parse repetition count, if any. */
for (nreps = 0, nseen = false;; j++, nseen = true) {
switch (opts[j]) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9':
nreps *= 10;
nreps += opts[j] - '0';
break;
default:
goto MALLOC_OUT;
}
}
MALLOC_OUT:
if (nseen == false)
nreps = 1;
for (k = 0; k < nreps; k++) {
switch (opts[j]) {
case 'a':
opt_abort = false;
break;
case 'A':
opt_abort = true;
break;
case 'b':
#ifdef MALLOC_BALANCE
opt_balance_threshold >>= 1;
#endif
break;
case 'B':
#ifdef MALLOC_BALANCE
if (opt_balance_threshold == 0)
opt_balance_threshold = 1;
else if ((opt_balance_threshold << 1)
> opt_balance_threshold)
opt_balance_threshold <<= 1;
#endif
break;
case 'f':
opt_dirty_max >>= 1;
break;
case 'F':
if (opt_dirty_max == 0)
opt_dirty_max = 1;
else if ((opt_dirty_max << 1) != 0)
opt_dirty_max <<= 1;
break;
#ifdef MALLOC_FILL
case 'j':
opt_junk = false;
break;
case 'J':
opt_junk = true;
break;
#endif
#ifndef MALLOC_STATIC_SIZES
case 'k':
/*
* Chunks always require at least one
* header page, so chunks can never be
* smaller than two pages.
*/
if (opt_chunk_2pow > pagesize_2pow + 1)
opt_chunk_2pow--;
break;
case 'K':
if (opt_chunk_2pow + 1 <
(sizeof(size_t) << 3))
opt_chunk_2pow++;
break;
#endif
case 'n':
opt_narenas_lshift--;
break;
case 'N':
opt_narenas_lshift++;
break;
#ifdef MALLOC_PAGEFILE
case 'o':
/* Do not over-commit. */
opt_pagefile = true;
break;
case 'O':
/* Allow over-commit. */
opt_pagefile = false;
break;
#endif
case 'p':
opt_print_stats = false;
break;
case 'P':
opt_print_stats = true;
break;
#ifndef MALLOC_STATIC_SIZES
case 'q':
if (opt_quantum_2pow > QUANTUM_2POW_MIN)
opt_quantum_2pow--;
break;
case 'Q':
if (opt_quantum_2pow < pagesize_2pow -
1)
opt_quantum_2pow++;
break;
case 's':
if (opt_small_max_2pow >
QUANTUM_2POW_MIN)
opt_small_max_2pow--;
break;
case 'S':
if (opt_small_max_2pow < pagesize_2pow
- 1)
opt_small_max_2pow++;
break;
#endif
#ifdef MALLOC_UTRACE
case 'u':
opt_utrace = false;
break;
case 'U':
opt_utrace = true;
break;
#endif
#ifdef MALLOC_SYSV
case 'v':
opt_sysv = false;
break;
case 'V':
opt_sysv = true;
break;
#endif
#ifdef MALLOC_XMALLOC
case 'x':
opt_xmalloc = false;
break;
case 'X':
opt_xmalloc = true;
break;
#endif
#ifdef MALLOC_FILL
case 'z':
opt_zero = false;
break;
case 'Z':
opt_zero = true;
break;
#endif
default: {
char cbuf[2];
cbuf[0] = opts[j];
cbuf[1] = '\0';
_malloc_message(_getprogname(),
": (malloc) Unsupported character "
"in malloc options: '", cbuf,
"'\n");
}
}
}
}
}
/* Take care to call atexit() only once. */
if (opt_print_stats) {
#ifndef MOZ_MEMORY_WINDOWS
/* Print statistics at exit. */
atexit(malloc_print_stats);
#endif
}
#if !defined(MOZ_MEMORY_WINDOWS) && !defined(MOZ_MEMORY_DARWIN)
/* Prevent potential deadlock on malloc locks after fork. */
pthread_atfork(_malloc_prefork, _malloc_postfork, _malloc_postfork);
#endif
#ifndef MALLOC_STATIC_SIZES
/* Set variables according to the value of opt_small_max_2pow. */
if (opt_small_max_2pow < opt_quantum_2pow)
opt_small_max_2pow = opt_quantum_2pow;
small_max = (1U << opt_small_max_2pow);
/* Set bin-related variables. */
bin_maxclass = (pagesize >> 1);
assert(opt_quantum_2pow >= TINY_MIN_2POW);
ntbins = opt_quantum_2pow - TINY_MIN_2POW;
assert(ntbins <= opt_quantum_2pow);
nqbins = (small_max >> opt_quantum_2pow);
nsbins = pagesize_2pow - opt_small_max_2pow - 1;
/* Set variables according to the value of opt_quantum_2pow. */
quantum = (1U << opt_quantum_2pow);
quantum_mask = quantum - 1;
if (ntbins > 0)
small_min = (quantum >> 1) + 1;
else
small_min = 1;
assert(small_min <= quantum);
/* Set variables according to the value of opt_chunk_2pow. */
chunksize = (1LU << opt_chunk_2pow);
chunksize_mask = chunksize - 1;
chunk_npages = (chunksize >> pagesize_2pow);
arena_chunk_header_npages = calculate_arena_header_pages();
arena_maxclass = calculate_arena_maxclass();
#endif
#ifdef JEMALLOC_USES_MAP_ALIGN
/*
* When using MAP_ALIGN, the alignment parameter must be a power of two
* multiple of the system pagesize, or mmap will fail.
*/
assert((chunksize % pagesize) == 0);
assert((1 << (ffs(chunksize / pagesize) - 1)) == (chunksize/pagesize));
#endif
UTRACE(0, 0, 0);
/* Various sanity checks that regard configuration. */
assert(quantum >= sizeof(void *));
assert(quantum <= pagesize);
assert(chunksize >= pagesize);
assert(quantum * 4 <= chunksize);
/* Initialize chunks data. */
malloc_mutex_init(&huge_mtx);
extent_tree_ad_new(&huge);
#ifdef MALLOC_STATS
huge_nmalloc = 0;
huge_ndalloc = 0;
huge_allocated = 0;
huge_mapped = 0;
#endif
/* Initialize base allocation data structures. */
#ifdef MALLOC_STATS
base_mapped = 0;
base_committed = 0;
#endif
base_nodes = NULL;
malloc_mutex_init(&base_mtx);
#ifdef MOZ_MEMORY_NARENAS_DEFAULT_ONE
narenas = 1;
#else
if (ncpus > 1) {
/*
* For SMP systems, create four times as many arenas as there
* are CPUs by default.
*/
opt_narenas_lshift += 2;
}
/* Determine how many arenas to use. */
narenas = ncpus;
#endif
if (opt_narenas_lshift > 0) {
if ((narenas << opt_narenas_lshift) > narenas)
narenas <<= opt_narenas_lshift;
/*
* Make sure not to exceed the limits of what base_alloc() can
* handle.
*/
if (narenas * sizeof(arena_t *) > chunksize)
narenas = chunksize / sizeof(arena_t *);
} else if (opt_narenas_lshift < 0) {
if ((narenas >> -opt_narenas_lshift) < narenas)
narenas >>= -opt_narenas_lshift;
/* Make sure there is at least one arena. */
if (narenas == 0)
narenas = 1;
}
#ifdef MALLOC_BALANCE
assert(narenas != 0);
for (narenas_2pow = 0;
(narenas >> (narenas_2pow + 1)) != 0;
narenas_2pow++);
#endif
#ifdef NO_TLS
if (narenas > 1) {
static const unsigned primes[] = {1, 3, 5, 7, 11, 13, 17, 19,
23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83,
89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149,
151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211,
223, 227, 229, 233, 239, 241, 251, 257, 263};
unsigned nprimes, parenas;
/*
* Pick a prime number of hash arenas that is more than narenas
* so that direct hashing of pthread_self() pointers tends to
* spread allocations evenly among the arenas.
*/
assert((narenas & 1) == 0); /* narenas must be even. */
nprimes = (sizeof(primes) >> SIZEOF_INT_2POW);
parenas = primes[nprimes - 1]; /* In case not enough primes. */
for (i = 1; i < nprimes; i++) {
if (primes[i] > narenas) {
parenas = primes[i];
break;
}
}
narenas = parenas;
}
#endif
#ifndef NO_TLS
# ifndef MALLOC_BALANCE
next_arena = 0;
# endif
#endif
/* Allocate and initialize arenas. */
arenas = (arena_t **)base_alloc(sizeof(arena_t *) * narenas);
if (arenas == NULL) {
#ifndef MOZ_MEMORY_WINDOWS
malloc_mutex_unlock(&init_lock);
#endif
return (true);
}
/*
* Zero the array. In practice, this should always be pre-zeroed,
* since it was just mmap()ed, but let's be sure.
*/
memset(arenas, 0, sizeof(arena_t *) * narenas);
/*
* Initialize one arena here. The rest are lazily created in
* choose_arena_hard().
*/
arenas_extend(0);
if (arenas[0] == NULL) {
#ifndef MOZ_MEMORY_WINDOWS
malloc_mutex_unlock(&init_lock);
#endif
return (true);
}
#ifndef NO_TLS
/*
* Assign the initial arena to the initial thread, in order to avoid
* spurious creation of an extra arena if the application switches to
* threaded mode.
*/
#ifdef MOZ_MEMORY_WINDOWS
TlsSetValue(tlsIndex, arenas[0]);
#else
arenas_map = arenas[0];
#endif
#endif
/*
* Seed here for the initial thread, since choose_arena_hard() is only
* called for other threads. The seed value doesn't really matter.
*/
#ifdef MALLOC_BALANCE
SPRN(balance, 42);
#endif
malloc_spin_init(&arenas_lock);
#ifdef MALLOC_VALIDATE
chunk_rtree = malloc_rtree_new((SIZEOF_PTR << 3) - opt_chunk_2pow);
if (chunk_rtree == NULL)
return (true);
#endif
malloc_initialized = true;
#if defined(NEEDS_PTHREAD_MMAP_UNALIGNED_TSD)
if (pthread_key_create(&mmap_unaligned_tsd, NULL) != 0) {
malloc_printf("<jemalloc>: Error in pthread_key_create()\n");
}
#endif
#if defined(MOZ_MEMORY_DARWIN) && !defined(MOZ_REPLACE_MALLOC)
/*
* Overwrite the default memory allocator to use jemalloc everywhere.
*/
default_zone = malloc_default_zone();
/*
* We only use jemalloc with MacOS 10.6 and 10.7. jemalloc is disabled
* on 32-bit builds (10.5 and 32-bit 10.6) due to bug 702250, an
* apparent MacOS bug. In fact, this code isn't even compiled on
* 32-bit builds.
*
* We'll have to update our code to work with newer versions, because
* the malloc zone layout is likely to change.
*/
osx_use_jemalloc = (default_zone->version == SNOW_LEOPARD_MALLOC_ZONE_T_VERSION ||
default_zone->version == LION_MALLOC_ZONE_T_VERSION);
/* Allow us dynamically turn off jemalloc for testing. */
if (getenv("NO_MAC_JEMALLOC")) {
osx_use_jemalloc = false;
#ifdef __i386__
malloc_printf("Warning: NO_MAC_JEMALLOC has no effect on "
"i386 machines (such as this one).\n");
#endif
}
if (osx_use_jemalloc) {
/*
* Convert the default szone to an "overlay zone" that is capable
* of deallocating szone-allocated objects, but allocating new
* objects from jemalloc.
*/
size_t size = zone_version_size(default_zone->version);
szone2ozone(default_zone, size);
}
else {
szone = default_zone;
}
#endif
#ifndef MOZ_MEMORY_WINDOWS
malloc_mutex_unlock(&init_lock);
#endif
return (false);
}
/* XXX Why not just expose malloc_print_stats()? */
#ifdef MOZ_MEMORY_WINDOWS
void
malloc_shutdown()
{
malloc_print_stats();
}
#endif
/*
* End general internal functions.
*/
/******************************************************************************/
/*
* Begin malloc(3)-compatible functions.
*/
/*
* Even though we compile with MOZ_MEMORY, we may have to dynamically decide
* not to use jemalloc, as discussed above. However, we call jemalloc
* functions directly from mozalloc. Since it's pretty dangerous to mix the
* allocators, we need to call the OSX allocators from the functions below,
* when osx_use_jemalloc is not (dynamically) set.
*
* Note that we assume jemalloc is enabled on i386. This is safe because the
* only i386 versions of MacOS are 10.5 and 10.6, which we support. We have to
* do this because madvise isn't in the malloc zone struct for 10.5.
*
* This means that NO_MAC_JEMALLOC doesn't work on i386.
*/
#if defined(MOZ_MEMORY_DARWIN) && !defined(__i386__) && !defined(MOZ_REPLACE_MALLOC)
#define DARWIN_ONLY(A) if (!osx_use_jemalloc) { A; }
#else
#define DARWIN_ONLY(A)
#endif
MOZ_MEMORY_API void *
malloc_impl(size_t size)
{
void *ret;
DARWIN_ONLY(return (szone->malloc)(szone, size));
if (malloc_init()) {
ret = NULL;
goto RETURN;
}
if (size == 0) {
#ifdef MALLOC_SYSV
if (opt_sysv == false)
#endif
size = 1;
#ifdef MALLOC_SYSV
else {
ret = NULL;
goto RETURN;
}
#endif
}
ret = imalloc(size);
RETURN:
if (ret == NULL) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in malloc(): out of memory\n", "",
"");
abort();
}
#endif
errno = ENOMEM;
}
UTRACE(0, size, ret);
return (ret);
}
/*
* In ELF systems the default visibility allows symbols to be preempted at
* runtime. This in turn prevents the uses of memalign in this file from being
* optimized. What we do in here is define two aliasing symbols (they point to
* the same code): memalign and memalign_internal. The internal version has
* hidden visibility and is used in every reference from this file.
*
* For more information on this technique, see section 2.2.7 (Avoid Using
* Exported Symbols) in http://www.akkadia.org/drepper/dsohowto.pdf.
*/
#ifndef MOZ_REPLACE_MALLOC
#if defined(__GNUC__) && !defined(MOZ_MEMORY_DARWIN)
#define MOZ_MEMORY_ELF
#endif
#ifdef MOZ_MEMORY_SOLARIS
# ifdef __SUNPRO_C
void *
memalign_impl(size_t alignment, size_t size);
#pragma no_inline(memalign_impl)
# elif (defined(__GNUC__))
__attribute__((noinline))
# endif
#else
#if (defined(MOZ_MEMORY_ELF))
__attribute__((visibility ("hidden")))
#endif
#endif
#endif /* MOZ_REPLACE_MALLOC */
#ifdef MOZ_MEMORY_ELF
#define MEMALIGN memalign_internal
#else
#define MEMALIGN memalign_impl
#endif
#ifndef MOZ_MEMORY_ELF
MOZ_MEMORY_API
#endif
void *
MEMALIGN(size_t alignment, size_t size)
{
void *ret;
DARWIN_ONLY(return (szone->memalign)(szone, alignment, size));
assert(((alignment - 1) & alignment) == 0);
if (malloc_init()) {
ret = NULL;
goto RETURN;
}
if (size == 0) {
#ifdef MALLOC_SYSV
if (opt_sysv == false)
#endif
size = 1;
#ifdef MALLOC_SYSV
else {
ret = NULL;
goto RETURN;
}
#endif
}
alignment = alignment < sizeof(void*) ? sizeof(void*) : alignment;
ret = ipalloc(alignment, size);
RETURN:
#ifdef MALLOC_XMALLOC
if (opt_xmalloc && ret == NULL) {
_malloc_message(_getprogname(),
": (malloc) Error in memalign(): out of memory\n", "", "");
abort();
}
#endif
UTRACE(0, size, ret);
return (ret);
}
#ifdef MOZ_MEMORY_ELF
extern void *
memalign_impl(size_t alignment, size_t size) __attribute__((alias ("memalign_internal"), visibility ("default")));
#endif
MOZ_MEMORY_API int
posix_memalign_impl(void **memptr, size_t alignment, size_t size)
{
void *result;
/* Make sure that alignment is a large enough power of 2. */
if (((alignment - 1) & alignment) != 0 || alignment < sizeof(void *)) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in posix_memalign(): "
"invalid alignment\n", "", "");
abort();
}
#endif
return (EINVAL);
}
/* The 0-->1 size promotion is done in the memalign() call below */
result = MEMALIGN(alignment, size);
if (result == NULL)
return (ENOMEM);
*memptr = result;
return (0);
}
MOZ_MEMORY_API void *
aligned_alloc_impl(size_t alignment, size_t size)
{
if (size % alignment) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in aligned_alloc(): "
"size is not multiple of alignment\n", "", "");
abort();
}
#endif
return (NULL);
}
return MEMALIGN(alignment, size);
}
MOZ_MEMORY_API void *
valloc_impl(size_t size)
{
return (MEMALIGN(pagesize, size));
}
MOZ_MEMORY_API void *
calloc_impl(size_t num, size_t size)
{
void *ret;
size_t num_size;
DARWIN_ONLY(return (szone->calloc)(szone, num, size));
if (malloc_init()) {
num_size = 0;
ret = NULL;
goto RETURN;
}
num_size = num * size;
if (num_size == 0) {
#ifdef MALLOC_SYSV
if ((opt_sysv == false) && ((num == 0) || (size == 0)))
#endif
num_size = 1;
#ifdef MALLOC_SYSV
else {
ret = NULL;
goto RETURN;
}
#endif
/*
* Try to avoid division here. We know that it isn't possible to
* overflow during multiplication if neither operand uses any of the
* most significant half of the bits in a size_t.
*/
} else if (((num | size) & (SIZE_T_MAX << (sizeof(size_t) << 2)))
&& (num_size / size != num)) {
/* size_t overflow. */
ret = NULL;
goto RETURN;
}
ret = icalloc(num_size);
RETURN:
if (ret == NULL) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in calloc(): out of memory\n", "",
"");
abort();
}
#endif
errno = ENOMEM;
}
UTRACE(0, num_size, ret);
return (ret);
}
MOZ_MEMORY_API void *
realloc_impl(void *ptr, size_t size)
{
void *ret;
DARWIN_ONLY(return (szone->realloc)(szone, ptr, size));
if (size == 0) {
#ifdef MALLOC_SYSV
if (opt_sysv == false)
#endif
size = 1;
#ifdef MALLOC_SYSV
else {
if (ptr != NULL)
idalloc(ptr);
ret = NULL;
goto RETURN;
}
#endif
}
if (ptr != NULL) {
assert(malloc_initialized);
ret = iralloc(ptr, size);
if (ret == NULL) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in realloc(): out of "
"memory\n", "", "");
abort();
}
#endif
errno = ENOMEM;
}
} else {
if (malloc_init())
ret = NULL;
else
ret = imalloc(size);
if (ret == NULL) {
#ifdef MALLOC_XMALLOC
if (opt_xmalloc) {
_malloc_message(_getprogname(),
": (malloc) Error in realloc(): out of "
"memory\n", "", "");
abort();
}
#endif
errno = ENOMEM;
}
}
#ifdef MALLOC_SYSV
RETURN:
#endif
UTRACE(ptr, size, ret);
return (ret);
}
MOZ_MEMORY_API void
free_impl(void *ptr)
{
size_t offset;
DARWIN_ONLY((szone->free)(szone, ptr); return);
UTRACE(ptr, 0, 0);
/*
* A version of idalloc that checks for NULL pointer but only for
* huge allocations assuming that CHUNK_ADDR2OFFSET(NULL) == 0.
*/
assert(CHUNK_ADDR2OFFSET(NULL) == 0);
offset = CHUNK_ADDR2OFFSET(ptr);
if (offset != 0)
arena_dalloc(ptr, offset);
else if (ptr != NULL)
huge_dalloc(ptr);
}
/*
* End malloc(3)-compatible functions.
*/
/******************************************************************************/
/*
* Begin non-standard functions.
*/
/* This was added by Mozilla for use by SQLite. */
#if defined(MOZ_MEMORY_DARWIN) && !defined(MOZ_REPLACE_MALLOC)
static
#else
MOZ_MEMORY_API
#endif
size_t
malloc_good_size_impl(size_t size)
{
/*
* This duplicates the logic in imalloc(), arena_malloc() and
* arena_malloc_small().
*/
if (size < small_min) {
/* Small (tiny). */
size = pow2_ceil(size);
/*
* We omit the #ifdefs from arena_malloc_small() --
* it can be inaccurate with its size in some cases, but this
* function must be accurate.
*/
if (size < (1U << TINY_MIN_2POW))
size = (1U << TINY_MIN_2POW);
} else if (size <= small_max) {
/* Small (quantum-spaced). */
size = QUANTUM_CEILING(size);
} else if (size <= bin_maxclass) {
/* Small (sub-page). */
size = pow2_ceil(size);
} else if (size <= arena_maxclass) {
/* Large. */
size = PAGE_CEILING(size);
} else {
/*
* Huge. We use PAGE_CEILING to get psize, instead of using
* CHUNK_CEILING to get csize. This ensures that this
* malloc_usable_size(malloc(n)) always matches
* malloc_good_size(n).
*/
size = PAGE_CEILING(size);
}
return size;
}
#ifdef MOZ_MEMORY_ANDROID
MOZ_MEMORY_API size_t
malloc_usable_size_impl(void *ptr)
#else
MOZ_MEMORY_API size_t
malloc_usable_size_impl(const void *ptr)
#endif
{
DARWIN_ONLY(return (szone->size)(szone, ptr));
#ifdef MALLOC_VALIDATE
return (isalloc_validate(ptr));
#else
assert(ptr != NULL);
return (isalloc(ptr));
#endif
}
MOZ_JEMALLOC_API void
jemalloc_stats_impl(jemalloc_stats_t *stats)
{
size_t i;
assert(stats != NULL);
/*
* Gather runtime settings.
*/
stats->opt_abort = opt_abort;
stats->opt_junk =
#ifdef MALLOC_FILL
opt_junk ? true :
#endif
false;
stats->opt_utrace =
#ifdef MALLOC_UTRACE
opt_utrace ? true :
#endif
false;
stats->opt_sysv =
#ifdef MALLOC_SYSV
opt_sysv ? true :
#endif
false;
stats->opt_xmalloc =
#ifdef MALLOC_XMALLOC
opt_xmalloc ? true :
#endif
false;
stats->opt_zero =
#ifdef MALLOC_FILL
opt_zero ? true :
#endif
false;
stats->narenas = narenas;
stats->balance_threshold =
#ifdef MALLOC_BALANCE
opt_balance_threshold
#else
SIZE_T_MAX
#endif
;
stats->quantum = quantum;
stats->small_max = small_max;
stats->large_max = arena_maxclass;
stats->chunksize = chunksize;
stats->dirty_max = opt_dirty_max;
/*
* Gather current memory usage statistics.
*/
stats->mapped = 0;
stats->allocated = 0;
stats->waste = 0;
stats->page_cache = 0;
stats->bookkeeping = 0;
/* Get huge mapped/allocated. */
malloc_mutex_lock(&huge_mtx);
stats->mapped += huge_mapped;
stats->allocated += huge_allocated;
assert(huge_mapped >= huge_allocated);
malloc_mutex_unlock(&huge_mtx);
/* Get base mapped/allocated. */
malloc_mutex_lock(&base_mtx);
stats->mapped += base_mapped;
stats->bookkeeping += base_committed;
assert(base_mapped >= base_committed);
malloc_mutex_unlock(&base_mtx);
/* Iterate over arenas. */
for (i = 0; i < narenas; i++) {
arena_t *arena = arenas[i];
size_t arena_mapped, arena_allocated, arena_committed, arena_dirty;
if (arena == NULL) {
continue;
}
malloc_spin_lock(&arena->lock);
arena_mapped = arena->stats.mapped;
/* "committed" counts dirty and allocated memory. */
arena_committed = arena->stats.committed << pagesize_2pow;
arena_allocated = arena->stats.allocated_small +
arena->stats.allocated_large;
arena_dirty = arena->ndirty << pagesize_2pow;
malloc_spin_unlock(&arena->lock);
assert(arena_mapped >= arena_committed);
assert(arena_committed >= arena_allocated + arena_dirty);
/* "waste" is committed memory that is neither dirty nor
* allocated. */
stats->mapped += arena_mapped;
stats->allocated += arena_allocated;
stats->page_cache += arena_dirty;
stats->waste += arena_committed - arena_allocated - arena_dirty;
}
assert(stats->mapped >= stats->allocated + stats->waste +
stats->page_cache + stats->bookkeeping);
}
#ifdef MALLOC_DOUBLE_PURGE
/* Explicitly remove all of this chunk's MADV_FREE'd pages from memory. */
static void
hard_purge_chunk(arena_chunk_t *chunk)
{
/* See similar logic in arena_purge(). */
size_t i;
for (i = arena_chunk_header_npages; i < chunk_npages; i++) {
/* Find all adjacent pages with CHUNK_MAP_MADVISED set. */
size_t npages;
for (npages = 0;
chunk->map[i + npages].bits & CHUNK_MAP_MADVISED && i + npages < chunk_npages;
npages++) {
/* Turn off the chunk's MADV_FREED bit and turn on its
* DECOMMITTED bit. */
RELEASE_ASSERT(!(chunk->map[i + npages].bits & CHUNK_MAP_DECOMMITTED));
chunk->map[i + npages].bits ^= CHUNK_MAP_MADVISED_OR_DECOMMITTED;
}
/* We could use mincore to find out which pages are actually
* present, but it's not clear that's better. */
if (npages > 0) {
pages_decommit(((char*)chunk) + (i << pagesize_2pow), npages << pagesize_2pow);
pages_commit(((char*)chunk) + (i << pagesize_2pow), npages << pagesize_2pow);
}
i += npages;
}
}
/* Explicitly remove all of this arena's MADV_FREE'd pages from memory. */
static void
hard_purge_arena(arena_t *arena)
{
malloc_spin_lock(&arena->lock);
while (!LinkedList_IsEmpty(&arena->chunks_madvised)) {
LinkedList* next = arena->chunks_madvised.next;
arena_chunk_t *chunk =
LinkedList_Get(arena->chunks_madvised.next,
arena_chunk_t, chunks_madvised_elem);
hard_purge_chunk(chunk);
LinkedList_Remove(&chunk->chunks_madvised_elem);
}
malloc_spin_unlock(&arena->lock);
}
MOZ_JEMALLOC_API void
jemalloc_purge_freed_pages_impl()
{
size_t i;
for (i = 0; i < narenas; i++) {
arena_t *arena = arenas[i];
if (arena != NULL)
hard_purge_arena(arena);
}
}
#else /* !defined MALLOC_DOUBLE_PURGE */
MOZ_JEMALLOC_API void
jemalloc_purge_freed_pages_impl()
{
/* Do nothing. */
}
#endif /* defined MALLOC_DOUBLE_PURGE */
#ifdef MOZ_MEMORY_WINDOWS
void*
_recalloc(void *ptr, size_t count, size_t size)
{
size_t oldsize = (ptr != NULL) ? isalloc(ptr) : 0;
size_t newsize = count * size;
/*
* In order for all trailing bytes to be zeroed, the caller needs to
* use calloc(), followed by recalloc(). However, the current calloc()
* implementation only zeros the bytes requested, so if recalloc() is
* to work 100% correctly, calloc() will need to change to zero
* trailing bytes.
*/
ptr = realloc(ptr, newsize);
if (ptr != NULL && oldsize < newsize) {
memset((void *)((uintptr_t)ptr + oldsize), 0, newsize -
oldsize);
}
return ptr;
}
/*
* This impl of _expand doesn't ever actually expand or shrink blocks: it
* simply replies that you may continue using a shrunk block.
*/
void*
_expand(void *ptr, size_t newsize)
{
if (isalloc(ptr) >= newsize)
return ptr;
return NULL;
}
size_t
_msize(const void *ptr)
{
return malloc_usable_size_impl(ptr);
}
#endif
MOZ_JEMALLOC_API void
jemalloc_free_dirty_pages_impl(void)
{
size_t i;
for (i = 0; i < narenas; i++) {
arena_t *arena = arenas[i];
if (arena != NULL) {
malloc_spin_lock(&arena->lock);
arena_purge(arena, true);
malloc_spin_unlock(&arena->lock);
}
}
}
/*
* End non-standard functions.
*/
/******************************************************************************/
/*
* Begin library-private functions, used by threading libraries for protection
* of malloc during fork(). These functions are only called if the program is
* running in threaded mode, so there is no need to check whether the program
* is threaded here.
*/
static void
_malloc_prefork(void)
{
unsigned i;
/* Acquire all mutexes in a safe order. */
malloc_spin_lock(&arenas_lock);
for (i = 0; i < narenas; i++) {
if (arenas[i] != NULL)
malloc_spin_lock(&arenas[i]->lock);
}
malloc_mutex_lock(&base_mtx);
malloc_mutex_lock(&huge_mtx);
}
static void
_malloc_postfork(void)
{
unsigned i;
/* Release all mutexes, now that fork() has completed. */
malloc_mutex_unlock(&huge_mtx);
malloc_mutex_unlock(&base_mtx);
for (i = 0; i < narenas; i++) {
if (arenas[i] != NULL)
malloc_spin_unlock(&arenas[i]->lock);
}
malloc_spin_unlock(&arenas_lock);
}
/*
* End library-private functions.
*/
/******************************************************************************/
#ifdef HAVE_DLOPEN
# include <dlfcn.h>
#endif
#if defined(MOZ_MEMORY_DARWIN)
#if !defined(MOZ_REPLACE_MALLOC)
static void *
zone_malloc(malloc_zone_t *zone, size_t size)
{
return (malloc_impl(size));
}
static void *
zone_calloc(malloc_zone_t *zone, size_t num, size_t size)
{
return (calloc_impl(num, size));
}
static void *
zone_valloc(malloc_zone_t *zone, size_t size)
{
void *ret = NULL; /* Assignment avoids useless compiler warning. */
posix_memalign_impl(&ret, pagesize, size);
return (ret);
}
static void *
zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size)
{
return (memalign_impl(alignment, size));
}
static void *
zone_destroy(malloc_zone_t *zone)
{
/* This function should never be called. */
assert(false);
return (NULL);
}
static size_t
zone_good_size(malloc_zone_t *zone, size_t size)
{
return malloc_good_size_impl(size);
}
static size_t
ozone_size(malloc_zone_t *zone, void *ptr)
{
size_t ret = isalloc_validate(ptr);
if (ret == 0)
ret = szone->size(zone, ptr);
return ret;
}
static void
ozone_free(malloc_zone_t *zone, void *ptr)
{
if (isalloc_validate(ptr) != 0)
free_impl(ptr);
else {
size_t size = szone->size(zone, ptr);
if (size != 0)
(szone->free)(zone, ptr);
/* Otherwise we leak. */
}
}
static void *
ozone_realloc(malloc_zone_t *zone, void *ptr, size_t size)
{
size_t oldsize;
if (ptr == NULL)
return (malloc_impl(size));
oldsize = isalloc_validate(ptr);
if (oldsize != 0)
return (realloc_impl(ptr, size));
else {
oldsize = szone->size(zone, ptr);
if (oldsize == 0)
return (malloc_impl(size));
else {
void *ret = malloc_impl(size);
if (ret != NULL) {
memcpy(ret, ptr, (oldsize < size) ? oldsize :
size);
(szone->free)(zone, ptr);
}
return (ret);
}
}
}
static unsigned
ozone_batch_malloc(malloc_zone_t *zone, size_t size, void **results,
unsigned num_requested)
{
/* Don't bother implementing this interface, since it isn't required. */
return 0;
}
static void
ozone_batch_free(malloc_zone_t *zone, void **to_be_freed, unsigned num)
{
unsigned i;
for (i = 0; i < num; i++)
ozone_free(zone, to_be_freed[i]);
}
static void
ozone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
{
if (isalloc_validate(ptr) != 0) {
assert(isalloc_validate(ptr) == size);
free_impl(ptr);
} else {
assert(size == szone->size(zone, ptr));
l_szone.m16(zone, ptr, size);
}
}
static void
ozone_force_lock(malloc_zone_t *zone)
{
/* jemalloc locking is taken care of by the normal jemalloc zone. */
szone->introspect->force_lock(zone);
}
static void
ozone_force_unlock(malloc_zone_t *zone)
{
/* jemalloc locking is taken care of by the normal jemalloc zone. */
szone->introspect->force_unlock(zone);
}
static size_t
zone_version_size(int version)
{
switch (version)
{
case SNOW_LEOPARD_MALLOC_ZONE_T_VERSION:
return sizeof(snow_leopard_malloc_zone);
case LEOPARD_MALLOC_ZONE_T_VERSION:
return sizeof(leopard_malloc_zone);
default:
case LION_MALLOC_ZONE_T_VERSION:
return sizeof(lion_malloc_zone);
}
}
/*
* Overlay the default scalable zone (szone) such that existing allocations are
* drained, and further allocations come from jemalloc. This is necessary
* because Core Foundation directly accesses and uses the szone before the
* jemalloc library is even loaded.
*/
static void
szone2ozone(malloc_zone_t *default_zone, size_t size)
{
lion_malloc_zone *l_zone;
assert(malloc_initialized);
/*
* Stash a copy of the original szone so that we can call its
* functions as needed. Note that internally, the szone stores its
* bookkeeping data structures immediately following the malloc_zone_t
* header, so when calling szone functions, we need to pass a pointer to
* the original zone structure.
*/
memcpy(szone, default_zone, size);
/* OSX 10.7 allocates the default zone in protected memory. */
if (default_zone->version >= LION_MALLOC_ZONE_T_VERSION) {
void* start_of_page = (void*)((size_t)(default_zone) & ~pagesize_mask);
mprotect (start_of_page, size, PROT_READ | PROT_WRITE);
}
default_zone->size = (void *)ozone_size;
default_zone->malloc = (void *)zone_malloc;
default_zone->calloc = (void *)zone_calloc;
default_zone->valloc = (void *)zone_valloc;
default_zone->free = (void *)ozone_free;
default_zone->realloc = (void *)ozone_realloc;
default_zone->destroy = (void *)zone_destroy;
default_zone->batch_malloc = NULL;
default_zone->batch_free = ozone_batch_free;
default_zone->introspect = ozone_introspect;
/* Don't modify default_zone->zone_name; Mac libc may rely on the name
* being unchanged. See Mozilla bug 694896. */
ozone_introspect->enumerator = NULL;
ozone_introspect->good_size = (void *)zone_good_size;
ozone_introspect->check = NULL;
ozone_introspect->print = NULL;
ozone_introspect->log = NULL;
ozone_introspect->force_lock = (void *)ozone_force_lock;
ozone_introspect->force_unlock = (void *)ozone_force_unlock;
ozone_introspect->statistics = NULL;
/* Platform-dependent structs */
l_zone = (lion_malloc_zone*)(default_zone);
if (default_zone->version >= SNOW_LEOPARD_MALLOC_ZONE_T_VERSION) {
l_zone->m15 = (void (*)())zone_memalign;
l_zone->m16 = (void (*)())ozone_free_definite_size;
l_ozone_introspect.m9 = NULL;
}
if (default_zone->version >= LION_MALLOC_ZONE_T_VERSION) {
l_zone->m17 = NULL;
l_ozone_introspect.m10 = NULL;
l_ozone_introspect.m11 = NULL;
l_ozone_introspect.m12 = NULL;
l_ozone_introspect.m13 = NULL;
}
}
#endif
__attribute__((constructor))
void
jemalloc_darwin_init(void)
{
if (malloc_init_hard())
abort();
}
#endif
/*
* is_malloc(malloc_impl) is some macro magic to detect if malloc_impl is
* defined as "malloc" in mozmemory_wrap.h
*/
#define malloc_is_malloc 1
#define is_malloc_(a) malloc_is_ ## a
#define is_malloc(a) is_malloc_(a)
#if !defined(MOZ_MEMORY_DARWIN) && (is_malloc(malloc_impl) == 1)
# if defined(__GLIBC__) && !defined(__UCLIBC__)
/*
* glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
* to inconsistently reference libc's malloc(3)-compatible functions
* (bug 493541).
*
* These definitions interpose hooks in glibc. The functions are actually
* passed an extra argument for the caller return address, which will be
* ignored.
*/
MOZ_MEMORY_API void (*__free_hook)(void *ptr) = free_impl;
MOZ_MEMORY_API void *(*__malloc_hook)(size_t size) = malloc_impl;
MOZ_MEMORY_API void *(*__realloc_hook)(void *ptr, size_t size) = realloc_impl;
MOZ_MEMORY_API void *(*__memalign_hook)(size_t alignment, size_t size) = MEMALIGN;
# elif defined(RTLD_DEEPBIND)
/*
* XXX On systems that support RTLD_GROUP or DF_1_GROUP, do their
* implementations permit similar inconsistencies? Should STV_SINGLETON
* visibility be used for interposition where available?
*/
# error "Interposing malloc is unsafe on this system without libc malloc hooks."
# endif
#endif
#ifdef MOZ_MEMORY_WINDOWS
/*
* In the new style jemalloc integration jemalloc is built as a separate
* shared library. Since we're no longer hooking into the CRT binary,
* we need to initialize the heap at the first opportunity we get.
* DLL_PROCESS_ATTACH in DllMain is that opportunity.
*/
BOOL APIENTRY DllMain(HINSTANCE hModule,
DWORD reason,
LPVOID lpReserved)
{
switch (reason) {
case DLL_PROCESS_ATTACH:
/* Don't force the system to page DllMain back in every time
* we create/destroy a thread */
DisableThreadLibraryCalls(hModule);
/* Initialize the heap */
malloc_init_hard();
break;
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
#endif
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