> We need to call perf_event_overflow() for the last record of each event. > It's hard to detect which record is the last record of the event with one > pass walking. > > Also, I'm not sure how much we can save with one pass walking. The > optimization should only benefit large PEBS. The total number of records for > large PEBS should not be huge. > I will evaluate the performance impact of one pass walking. If there is > observed performance improvement, I will submit a separate patch later. > > For now, I think we can still use the mature two pass walking method.
Okay sounds reasonable to keep it then. Thanks, -Andi
