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runtime: don't let P's timer heap get clogged with deleted timers

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Whenever more than 1/4 of the timers on a P's heap are deleted,
remove them from the heap.

Change-Id: Iff63ed3d04e6f33ffc5c834f77f645c52c007e52
Reviewed-on: https://go-review.googlesource.com/c/go/+/214299
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Ian Lance Taylor 2020-01-09 23:03:25 -08:00
parent 1d4d7825a7
commit 641e61db57
3 changed files with 134 additions and 2 deletions
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4
src/runtime/runtime2.go
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@ -650,6 +650,10 @@ type p struct {
// such as timerModifying.
adjustTimers uint32
// Number of timerDeleted times in P's heap.
// Modified using atomic instructions.
deletedTimers uint32
// Race context used while executing timer functions.
timerRaceCtx uintptr