b0392159f6
Right now we only kind of sort of trace GC STW events. We emit events around mark termination, but those start well after stopping the world and end before starting it again, and we don't emit any events for sweep termination. Fix this by generalizing EvGCScanStart/EvGCScanDone. These were already re-purposed to indicate mark termination (despite the names). This commit renames them to EvGCSTWStart/EvGCSTWDone, adds an argument to indicate the STW reason, and shuffles the runtime to generate them right before stopping the world and right after starting the world, respectively. These events will make it possible to generate precise minimum mutator utilization (MMU) graphs and could be useful in detecting non-preemptible goroutines (e.g., #20792). Change-Id: If95783f370781d8ef66addd94886028103a7c26f Reviewed-on: https://go-review.googlesource.com/55411 Reviewed-by: Rick Hudson <rlh@golang.org> |
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