aboutsummaryrefslogtreecommitdiff
path: root/src/runtime/testdata
diff options
context:
space:
mode:
Diffstat (limited to 'src/runtime/testdata')
-rw-r--r--src/runtime/testdata/testprog/preempt.go3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/runtime/testdata/testprog/preempt.go b/src/runtime/testdata/testprog/preempt.go
index eb9f59053c..fb6755a372 100644
--- a/src/runtime/testdata/testprog/preempt.go
+++ b/src/runtime/testdata/testprog/preempt.go
@@ -21,7 +21,8 @@ func AsyncPreempt() {
// Disable GC so we have complete control of what we're testing.
debug.SetGCPercent(-1)
// Out of an abundance of caution, also make sure that there are
- // no GCs actively in progress.
+ // no GCs actively in progress. The sweep phase of a GC cycle
+ // for instance tries to preempt Ps at the very beginning.
runtime.GC()
// Start a goroutine with no sync safe-points.