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internal/trace: add comment for stable sort
As per comments in cl/11834. Change-Id: I285536b882fa9496e15d77d0d4c16ee913aca581 Reviewed-on: https://go-review.googlesource.com/11861 Reviewed-by: Daniel Theophanes <kardianos@gmail.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -254,6 +254,8 @@ func parseEvents(rawEvents []rawEvent) (events []*Event, err error) {
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}
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// Sort by time and translate cpu ticks to real time.
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// Use stable sort because adjacent events in a batch can have the same timestamp
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// (this was observed on some VMs).
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sort.Stable(eventList(events))
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if ticksPerSec == 0 {
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err = fmt.Errorf("no EvFrequency event")
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