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Make our allocator use multiple arenas based on number of CPU cores.

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This commit is contained in:
wolfbeast 2018-04-28 08:59:44 +02:00 • committed by Roy Tam
commit 30e71338fd
1 changed files with 19 additions and 21 deletions
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40
memory/mozjemalloc/jemalloc.c
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@ -140,17 +140,9 @@
#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.
*
* When using the Servo style system, we do indeed make use of significant
* concurrent allocation, and the overhead matters. Bug 1291355 tracks
* investigating the fragmentation overhead of turning this on for users.
* Uncomment this to use only one arena by default.
*/
#ifndef MOZ_STYLO
#define MOZ_MEMORY_NARENAS_DEFAULT_ONE
#endif
// #define MOZ_MEMORY_NARENAS_DEFAULT_ONE
/*
* Pass this set of options to jemalloc as its default. It does not override
@ -5251,7 +5243,10 @@ huge_dalloc(void *ptr)
base_node_dealloc(node);
}
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
/*
* Platform-specific methods to determine the number of CPUs in a system.
* This will be used to determine the desired number of arenas.
*/
#ifdef MOZ_MEMORY_BSD
static inline unsigned
malloc_ncpus(void)
@ -5349,11 +5344,19 @@ malloc_ncpus(void)
{
return sysconf(_SC_NPROCESSORS_ONLN);
}
#elif (defined(MOZ_MEMORY_WINDOWS))
static inline unsigned
malloc_ncpus(void)
{
SYSTEM_INFO info;
GetSystemInfo(&info);
return (info.dwNumberOfProcessors);
}
#else
static inline unsigned
malloc_ncpus(void)
{
/*
* We lack a way to determine the number of CPUs on this platform, so
* assume 1 CPU.
@ -5361,7 +5364,6 @@ malloc_ncpus(void)
return (1);
}
#endif
#endif
static void
malloc_print_stats(void)
@ -5562,20 +5564,16 @@ malloc_init_hard(void)
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
#ifndef MOZ_MEMORY_NARENAS_DEFAULT_ONE
ncpus = malloc_ncpus();
#endif
/* We assume that the page size is a power of 2. */
assert(((result - 1) & result) == 0);
#ifdef MALLOC_STATIC_SIZES