419c06455a
Currently if a profiling signal arrives while executing within a VDSO the profiler will report _ExternalCode, which is needlessly confusing for a pure Go program. Change the VDSO calling code to record the caller's PC/SP, so that we can do a traceback from that point. If that fails for some reason, report _VDSO rather than _ExternalCode, which should at least point in the right direction. This adds some instructions to the code that calls the VDSO, but the slowdown is reasonably negligible: name old time/op new time/op delta ClockVDSOAndFallbackPaths/vDSO-8 40.5ns ± 2% 41.3ns ± 1% +1.85% (p=0.002 n=10+10) ClockVDSOAndFallbackPaths/Fallback-8 41.9ns ± 1% 43.5ns ± 1% +3.84% (p=0.000 n=9+9) TimeNow-8 41.5ns ± 3% 41.5ns ± 2% ~ (p=0.723 n=10+10) Fixes #24142 Change-Id: Iacd935db3c4c782150b3809aaa675a71799b1c9c Reviewed-on: https://go-review.googlesource.com/97315 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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The Go Programming Language
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