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authorwolfbeast <mcwerewolf@gmail.com>2018-04-28 08:59:44 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-04-28 08:59:44 +0200
commit08e66d35127fc77abf1aebe88a84eb0c20c9046f (patch)
treec982551a9591018ece1a719dbb39edb4b894a97a /memory
parentffd62ae6c93c30b16a7e9331d7cbd6b7fe9afb62 (diff)
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Make our allocator use multiple arenas based on number of CPU cores.
Diffstat (limited to 'memory')
-rw-r--r--memory/mozjemalloc/jemalloc.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/memory/mozjemalloc/jemalloc.c b/memory/mozjemalloc/jemalloc.c
index 8516658f5..0cbd2821e 100644
--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -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