Re: [RFC 3/6] perf/core: use rb-tree to sched in event groups

[Mark Rutland]

On Wed, Jan 11, 2017 at 08:31:11PM +0000, Liang, Kan wrote:

> > Kan, in your per-cpu event list patch you mentioned that you saw a large
> > overhead in perf_iterate_ctx() when skipping events for other CPUs.
> > Which callers of perf_iterate_ctx() specifically was that problematic for? Do
> > those callers only care about the *active* events, for example?
> 
> Based on my test, the large overhead was observed in perf_iterate_sb.
> Yes, it only cares about the *active* events.

Great!

That should mean the first patch of this series (adding the active
events lists) should give us sufficient infrastructure to solve that
particular issue.

Thanks,
Mark.