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runtime: make p.gcBgMarkWorker a guintptr

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Currently p.gcBgMarkWorker is a *g. Change it to a guintptr. This
eliminates a write barrier during the subtle mark worker parking dance
(which isn't known to be causing problems, but may).

Change-Id: Ibf12c05ac910820448059e69a68e5b882c993ed8
Reviewed-on: https://go-review.googlesource.com/18970
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Austin Clements 2016-01-26 14:44:58 -05:00 • committed by Russ Cox
parent 08594ac7c7
commit 09940b92a0
3 changed files with 14 additions and 19 deletions
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2
src/runtime/runtime2.go
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@ -388,7 +388,7 @@ type p struct {
// Per-P GC state
gcAssistTime int64 // Nanoseconds in assistAlloc
gcBgMarkWorker *g
gcBgMarkWorker guintptr
gcMarkWorkerMode gcMarkWorkerMode
// gcw is this P's GC work buffer cache. The work buffer is