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runtime: document scanstack

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Also mark it go:systemstack and explain why.

Change-Id: I88baf22741c04012ba2588d8e03dd3801d19b5c0
Reviewed-on: https://go-review.googlesource.com/23390
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2016-05-23 22:05:51 -04:00
parent a689f6b8af
commit a1f7db88f8
1 changed files with 10 additions and 0 deletions
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10
src/runtime/mgcmark.go
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@ -642,7 +642,17 @@ func gcFlushBgCredit(scanWork int64) {
unlock(&work.assistQueue.lock)
}
// scanstack scans gp's stack, greying all pointers found on the stack.
//
// During mark phase, it also installs stack barriers while traversing
// gp's stack. During mark termination, it stops scanning when it
// reaches an unhit stack barrier.
//
// scanstack is marked go:systemstack because it must not be preempted
// while using a workbuf.
//
//go:nowritebarrier
//go:systemstack
func scanstack(gp *g) {
if gp.gcscanvalid {
return