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Bug 691003 - jemalloc's minimum alignment must be word sized on *nix. r=khuey

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--HG--
extra : rebase_source : 24c31b1afcc10af36f6d87ec6ec3e462b18cceff
This commit is contained in:
Justin Lebar 2011-10-05 14:03:39 -04:00
parent 44d7dfe783
commit 883266b5b9
1 changed files with 13 additions and 2 deletions
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15
memory/jemalloc/jemalloc.c
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@ -82,6 +82,10 @@
* | | ... |
* |=====================================|
*
* 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
@ -426,7 +430,7 @@ static const bool __isthreaded = true;
/* Size of stack-allocated buffer passed to strerror_r(). */
#define STRERROR_BUF 64
/* Minimum alignment of allocations is 2^QUANTUM_2POW_MIN bytes. */
/* 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
@ -515,8 +519,15 @@ static const bool __isthreaded = true;
#define CACHELINE_2POW 6
#define CACHELINE ((size_t)(1U << CACHELINE_2POW))
/* Smallest size class to support. */
/*
* 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)