diff options
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/pprof/pprof_test.go | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go index 2e6165ff88..b3a8927dc7 100644 --- a/src/runtime/pprof/pprof_test.go +++ b/src/runtime/pprof/pprof_test.go @@ -1425,6 +1425,11 @@ func TestLabelRace(t *testing.T) { // TestLabelSystemstack makes sure CPU profiler samples of goroutines running // on systemstack include the correct pprof labels. See issue #48577 func TestLabelSystemstack(t *testing.T) { + // Grab and re-set the initial value before continuing to ensure + // GOGC doesn't actually change following the test. + gogc := debug.SetGCPercent(100) + debug.SetGCPercent(gogc) + matches := matchAndAvoidStacks(stackContainsLabeled, []string{"runtime.systemstack;key=value"}, avoidFunctions()) p := testCPUProfile(t, matches, func(dur time.Duration) { Do(context.Background(), Labels("key", "value"), func(context.Context) { @@ -1434,7 +1439,7 @@ func TestLabelSystemstack(t *testing.T) { wg.Add(1) go func() { defer wg.Done() - labelHog(stop) + labelHog(stop, gogc) }() } @@ -1467,13 +1472,13 @@ func TestLabelSystemstack(t *testing.T) { // labelHog is designed to burn CPU time in a way that a high number of CPU // samples end up running on systemstack. -func labelHog(stop chan struct{}) { +func labelHog(stop chan struct{}, gogc int) { for i := 0; ; i++ { select { case <-stop: return default: - fmt.Fprintf(io.Discard, "%d", i) + debug.SetGCPercent(gogc) } } } |