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runtime: document that tracefpunwindoff applies to some profilers

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The tracefpunwindoff GODEBUG applies to all the places where we use
frame pointer unwinding. Originally that was just the execution tracer,
but now we also use it for the block and mutex profilers.

Change-Id: I6a6a69641fede668d96335582dba6d43e62f6a51
Reviewed-on: https://go-review.googlesource.com/c/go/+/718522
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Nick Ripley <nick.ripley@datadoghq.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Nick Ripley 2025-11-06 09:40:21 -05:00 • committed by Gopher Robot
parent 1c1c1942ba
commit 32f8d6486f
1 changed files with 5 additions and 4 deletions
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9
src/runtime/extern.go
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@ -211,10 +211,11 @@ It is a comma-separated list of name=val pairs setting these named variables:
report. This also extends the information returned by runtime.Stack.
Setting N to 0 will report no ancestry information.
tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
use the runtime's default stack unwinder instead of frame pointer unwinding.
This increases tracer overhead, but could be helpful as a workaround or for
debugging unexpected regressions caused by frame pointer unwinding.
tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer
and block and mutex profilers to use the runtime's default stack
unwinder instead of frame pointer unwinding. This increases their
overhead, but could be helpful as a workaround or for debugging
unexpected regressions caused by frame pointer unwinding.
traceadvanceperiod: the approximate period in nanoseconds between trace generations. Only
applies if a program is built with GOEXPERIMENT=exectracer2. Used primarily for testing