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runtime: don't call setitimer for each thread

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Previously, on Unix systems, when the profiler was enabled or disabled,
we called setitimer once per thread. With this change we instead call
it once per process.

Change-Id: I90f0189b562e11232816390dc7d55ed154bd836d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240003
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Ian Lance Taylor 2020-06-25 14:50:10 -07:00
parent 31da1d993a
commit bd519d0c87
1 changed files with 10 additions and 11 deletions
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21
src/runtime/signal_unix.go
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@ -272,6 +272,12 @@ func setProcessCPUProfiler(hz int32) {
atomic.Storeuintptr(&fwdSig[_SIGPROF], getsig(_SIGPROF))
setsig(_SIGPROF, funcPC(sighandler))
}
var it itimerval
it.it_interval.tv_sec = 0
it.it_interval.set_usec(1000000 / hz)
it.it_value = it.it_interval
setitimer(_ITIMER_PROF, &it, nil)
} else {
// If the Go signal handler should be disabled by default,
// switch back to the signal handler that was installed
@ -296,23 +302,16 @@ func setProcessCPUProfiler(hz int32) {
setsig(_SIGPROF, h)
}
}
setitimer(_ITIMER_PROF, &itimerval{}, nil)
}
}
// setThreadCPUProfiler makes any thread-specific changes required to
// implement profiling at a rate of hz.
// No changes required on Unix systems.
func setThreadCPUProfiler(hz int32) {
var it itimerval
if hz == 0 {
setitimer(_ITIMER_PROF, &it, nil)
} else {
it.it_interval.tv_sec = 0
it.it_interval.set_usec(1000000 / hz)
it.it_value = it.it_interval
setitimer(_ITIMER_PROF, &it, nil)
}
_g_ := getg()
_g_.m.profilehz = hz
getg().m.profilehz = hz
}
func sigpipe() {