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runtime: use per-thread profiler for SetCgoTraceback platforms

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Updates #35057

Change-Id: I61d772a2cbfb27540fb70c14676c68593076ca94
Reviewed-on: https://go-review.googlesource.com/c/go/+/342054
Run-TryBot: Rhys Hiltner <rhys@justin.tv>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Rhys Hiltner 2021-08-13 09:01:13 -07:00 • committed by Michael Pratt
parent 5b90958084
commit 8d09f7c517
6 changed files with 81 additions and 18 deletions
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21
src/runtime/signal_unix.go
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@ -480,15 +480,26 @@ var sigprofCallersUse uint32
// and the signal handler collected a stack trace in sigprofCallers.
// When this is called, sigprofCallersUse will be non-zero.
// g is nil, and what we can do is very limited.
//
// It is called from the signal handling functions written in assembly code that
// are active for cgo programs, cgoSigtramp and sigprofNonGoWrapper, which have
// not verified that the SIGPROF delivery corresponds to the best available
// profiling source for this thread.
//
//go:nosplit
//go:nowritebarrierrec
func sigprofNonGo() {
func sigprofNonGo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
if prof.hz != 0 {
n := 0
for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
n++
c := &sigctxt{info, ctx}
// Some platforms (Linux) have per-thread timers, which we use in
// combination with the process-wide timer. Avoid double-counting.
if validSIGPROF(nil, c) {
n := 0
for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
n++
}
cpuprof.addNonGo(sigprofCallers[:n])
}
cpuprof.addNonGo(sigprofCallers[:n])
}
atomic.Store(&sigprofCallersUse, 0)