RE: [PATCH] perf/core: introduce context per CPU event list

[Liang, Kan]

> > I don't think those need be tracked at all, they're immaterial for
> > actual scheduling. Once we ioctl() them back to life we can insert
> > them into the tree.
> 
> Sure, that sounds fine for scheduling (including big.LITTLE).
> 
> I might still be misunderstanding something, but I don't think that helps
> Kan's case: since INACTIVE events which will fail their filters (including the
> CPU check) will still be in the tree, they will still have to be iterated over.
> 
> That is, unless we also sort the tree by event->cpu, or if in those cases we
> only care about ACTIVE events and can use an active list.

Yes, if we can sort the tree by event->cpu, we can minimize the iteration in
the perf_iterate_ctx. That should help on reducing the overhead.


Thanks,
Kan