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| author | Dmitriy Vyukov <dvyukov@google.com> | 2014-08-06 01:50:37 +0400 |
|---|---|---|
| committer | Dmitriy Vyukov <dvyukov@google.com> | 2014-08-06 01:50:37 +0400 |
| commit | f6f2f77142fcf0a4ec317bff6850ffb6ee6f0bb2 (patch) | |
| tree | b56dd602fe37ab281e8739cca8295038ba5c1d60 /src/pkg/runtime/malloc.h | |
| parent | 22e08d1a3b6fba51df3bcad9a5f0d70fefd0412d (diff) | |
| download | go-f6f2f77142fcf0a4ec317bff6850ffb6ee6f0bb2.tar.xz | |
runtime: cache one GC workbuf in thread-local storage
We call scanblock for lots of small root pieces
e.g. for every stack frame args and locals area.
Every scanblock invocation calls getempty/putempty,
which accesses lock-free stack shared among all worker threads.
One-element local cache allows most scanblock calls
to proceed without accessing the shared stack.
LGTM=rsc
R=golang-codereviews, rlh
CC=golang-codereviews, khr, rsc
https://golang.org/cl/121250043
Diffstat (limited to 'src/pkg/runtime/malloc.h')
| -rw-r--r-- | src/pkg/runtime/malloc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/pkg/runtime/malloc.h b/src/pkg/runtime/malloc.h index 958c540361..810d4ac402 100644 --- a/src/pkg/runtime/malloc.h +++ b/src/pkg/runtime/malloc.h @@ -334,6 +334,8 @@ struct MCache StackFreeList stackcache[NumStackOrders]; + void* gcworkbuf; + // Local allocator stats, flushed during GC. uintptr local_nlookup; // number of pointer lookups uintptr local_largefree; // bytes freed for large objects (>MaxSmallSize) @@ -344,6 +346,7 @@ struct MCache MSpan* runtime·MCache_Refill(MCache *c, int32 sizeclass); void runtime·MCache_ReleaseAll(MCache *c); void runtime·stackcache_clear(MCache *c); +void runtime·gcworkbuffree(void *b); enum { |