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runtime: capture per-m trace state in a type

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More tightening up of the tracer's interface.

While we're here, clarify why waittraceskip isn't included by explaining
what the wait* fields in the M are really for.

Change-Id: I0e7b4cac79fb77a7a0b3ca6b6cc267668e3610bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/494190
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Anthony Knyszek 2023-05-10 20:36:08 +00:00 • committed by Gopher Robot
parent c213c905a2
commit 2f35a655e7
2 changed files with 19 additions and 10 deletions
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10
src/runtime/runtime2.go
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@ -577,13 +577,17 @@ type m struct {
lockedExt uint32 // tracking for external LockOSThread
lockedInt uint32 // tracking for internal lockOSThread
nextwaitm muintptr // next m waiting for lock
// wait* are used to carry arguments from gopark into park_m, because
// there's no stack to put them on. That is their sole purpose.
waitunlockf func(*g, unsafe.Pointer) bool
waitlock unsafe.Pointer
waittraceev byte
waittraceskip int
startingtrace bool
syscalltick uint32
freelink *m // on sched.freem
syscalltick uint32
freelink *m // on sched.freem
trace mTraceState
// these are here because they are too large to be on the stack
// of low-level NOSPLIT functions.