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runtime: align mcentral by cache line size

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This may improve perormance during concurrent access
to mheap.central array from multiple CPU cores.

Change-Id: I8f48dd2e72aa62e9c32de07ae60fe552d8642782
Reviewed-on: https://go-review.googlesource.com/41550
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Aliaksandr Valialkin 2017-04-24 17:26:41 +03:00 • committed by Ian Lance Taylor
parent c433c374b5
commit 259d60995d
1 changed files with 1 additions and 1 deletions
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2
src/runtime/mheap.go
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@ -121,7 +121,7 @@ type mheap struct {
// gets its own cache line.
central [_NumSizeClasses]struct {
mcentral mcentral
pad [sys.CacheLineSize]byte
pad [sys.CacheLineSize - unsafe.Sizeof(mcentral{})%sys.CacheLineSize]byte
}
spanalloc fixalloc // allocator for span*