3bf1644428
Also, avoid Region creation when tracing is disabled. Unfortunate side-effect of this change is that we no longer trace pre-existing regions in tracing, but we can add the feature in the future when we find it useful and justifiable. Until then, let's avoid the overhead from this low-level api use as much as possible. goos: linux goarch: amd64 pkg: runtime/trace // Trace disabled BenchmarkStartRegion-12 2000000000 0.66 ns/op 0 B/op 0 allocs/op BenchmarkNewTask-12 30000000 40.4 ns/op 56 B/op 2 allocs/op // Trace enabled, -trace=/dev/null BenchmarkStartRegion-12 5000000 287 ns/op 32 B/op 1 allocs/op BenchmarkNewTask-12 5000000 283 ns/op 56 B/op 2 allocs/op Also, skip other tests if tracing is already enabled. Change-Id: Id3028d60b5642fcab4b09a74fd7d79361a3861e5 Reviewed-on: https://go-review.googlesource.com/109115 Reviewed-by: Peter Weinberger <pjw@google.com> |
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