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runtime: update triggerRatio in setGCPercent

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Currently, runtime/debug.SetGCPercent does not adjust the controller
trigger ratio. As a result, runtime reductions of GOGC don't take full
effect until after one more concurrent cycle has happened, which
adjusts the trigger ratio to account for the new gcpercent.

Fix this by lowering the trigger ratio if necessary in setGCPercent.

Change-Id: I4d23e0c58d91939b86ac60fa5d53ef91d0d89e0c
Reviewed-on: https://go-review.googlesource.com/17813
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Austin Clements 2015-12-14 15:38:12 -05:00
parent 1e1ea66991
commit 2bacae815b
1 changed files with 3 additions and 0 deletions
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3
src/runtime/mgc.go
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@ -202,6 +202,9 @@ func setGCPercent(in int32) (out int32) {
}
gcpercent = in
heapminimum = defaultHeapMinimum * uint64(gcpercent) / 100
if gcController.triggerRatio > float64(gcpercent)/100 {
gcController.triggerRatio = float64(gcpercent) / 100
}
unlock(&mheap_.lock)
return out
}