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runtime: perform gcMarkRootCheck during STW in checkmark mode

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gcMarkRootCheck is too expensive to do during mark termination.
However, since it's a useful check and it complements checkmark mode
nicely, enable it during mark termination is checkmark is enabled.

Change-Id: Icd9039e85e6e9d22747454441b50f1cdd1412202
Reviewed-on: https://go-review.googlesource.com/20663
Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2016-03-14 13:51:23 -04:00
parent a96884cf6c
commit d7cedc4b74
1 changed files with 5 additions and 2 deletions
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7
src/runtime/mgc.go
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@ -1554,8 +1554,11 @@ func gcMark(start_time int64) {
gcDrain(gcw, gcDrainBlock)
gcw.dispose()
// TODO: Re-enable once this is cheap.
//gcMarkRootCheck()
if debug.gccheckmark > 0 {
// This is expensive when there's a large number of
// Gs, so only do it if checkmark is also enabled.
gcMarkRootCheck()
}
if work.full != 0 {
throw("work.full != 0")
}