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runtime: run mutexevent profiling without holding semaRoot lock

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Suggested by Dmitry in CL 36792 review.
Clearly safe since there are many different semaRoots
that could all have profiled sudogs calling mutexevent.

Change-Id: I45eed47a5be3e513b2dad63b60afcd94800e16d1
Reviewed-on: https://go-review.googlesource.com/37104
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
This commit is contained in:
Russ Cox 2017-02-13 09:24:05 -05:00
parent 83f95b85de
commit 58d762176a
1 changed files with 4 additions and 3 deletions
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7
src/runtime/sema.go
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@ -174,13 +174,14 @@ func semrelease(addr *uint32) {
s, t0 := root.dequeue(addr)
if s != nil {
atomic.Xadd(&root.nwait, -1)
if s.acquiretime != 0 {
mutexevent(t0-s.acquiretime, 3)
}
}
unlock(&root.lock)
if s != nil { // May be slow, so unlock first
acquiretime := s.acquiretime
readyWithTime(s, 5)
if acquiretime != 0 {
mutexevent(t0-acquiretime, 3)
}
}
}