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104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/* -*- Mode: C; tab-width: 8; c-basic-offset: 8 -*- */
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/* vim:set softtabstop=8 shiftwidth=8: */
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/*-
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* Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _JEMALLOC_H_
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#define _JEMALLOC_H_
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#if defined(MOZ_MEMORY_DARWIN)
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#include <malloc/malloc.h>
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#endif
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#include "jemalloc_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(MOZ_MEMORY_LINUX)
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__attribute__((weak))
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#endif
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void jemalloc_stats(jemalloc_stats_t *stats);
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/* Computes the usable size in advance. */
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#if !defined(MOZ_MEMORY_DARWIN)
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#if defined(MOZ_MEMORY_LINUX)
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__attribute__((weak))
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#endif
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size_t je_malloc_good_size(size_t size);
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#endif
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static inline size_t je_malloc_usable_size_in_advance(size_t size) {
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#if defined(MOZ_MEMORY_DARWIN)
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return malloc_good_size(size);
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#else
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if (je_malloc_good_size)
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return je_malloc_good_size(size);
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else
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return size;
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#endif
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}
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/*
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* On some operating systems (Mac), we use madvise(MADV_FREE) to hand pages
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* back to the operating system. On Mac, the operating system doesn't take
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* this memory back immediately; instead, the OS takes it back only when the
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* machine is running out of physical memory.
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*
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* This is great from the standpoint of efficiency, but it makes measuring our
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* actual RSS difficult, because pages which we've MADV_FREE'd shouldn't count
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* against our RSS.
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*
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* This function explicitly purges any MADV_FREE'd pages from physical memory,
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* causing our reported RSS match the amount of memory we're actually using.
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*
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* Note that this call is expensive in two ways. First, it may be slow to
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* execute, because it may make a number of slow syscalls to free memory. This
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* function holds the big jemalloc locks, so basically all threads are blocked
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* while this function runs.
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*
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* This function is also expensive in that the next time we go to access a page
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* which we've just explicitly decommitted, the operating system has to attach
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* to it a physical page! If we hadn't run this function, the OS would have
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* less work to do.
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*
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* If MALLOC_DOUBLE_PURGE is not defined, this function does nothing.
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*/
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#if defined(MOZ_MEMORY_LINUX)
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static inline void jemalloc_purge_freed_pages() { }
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#else
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void jemalloc_purge_freed_pages();
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* _JEMALLOC_H_ */
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