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

From "Liang, Kan" <kan.liang@intel.com>
Newsgroups linux.kernel
Subject RE: [PATCH] perf/core: introduce context per CPU event list
Date 2016-11-10 15:40 +0100
Message-ID <sBYGd-7rk-23@gated-at.bofh.it> (permalink)
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> > 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

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Thread

[PATCH] perf/core: introduce context per CPU event list kan.liang@intel.com - 2016-11-09 20:10 +0100
  Re: [PATCH] perf/core: introduce context per CPU event list Peter Zijlstra <peterz@infradead.org> - 2016-11-10 09:40 +0100
    Re: [PATCH] perf/core: introduce context per CPU event list Mark Rutland <mark.rutland@arm.com> - 2016-11-10 12:10 +0100
      Re: [PATCH] perf/core: introduce context per CPU event list Peter Zijlstra <peterz@infradead.org> - 2016-11-10 12:40 +0100
        Re: [PATCH] perf/core: introduce context per CPU event list Mark Rutland <mark.rutland@arm.com> - 2016-11-10 13:10 +0100
          Re: [PATCH] perf/core: introduce context per CPU event list Peter Zijlstra <peterz@infradead.org> - 2016-11-10 13:20 +0100
            Re: [PATCH] perf/core: introduce context per CPU event list Mark Rutland <mark.rutland@arm.com> - 2016-11-10 13:30 +0100
              Re: [PATCH] perf/core: introduce context per CPU event list Peter Zijlstra <peterz@infradead.org> - 2016-11-10 14:00 +0100
                Re: [PATCH] perf/core: introduce context per CPU event list Mark Rutland <mark.rutland@arm.com> - 2016-11-10 15:20 +0100
                RE: [PATCH] perf/core: introduce context per CPU event list "Liang, Kan" <kan.liang@intel.com> - 2016-11-10 15:40 +0100
                Re: [PATCH] perf/core: introduce context per CPU event list Peter Zijlstra <peterz@infradead.org> - 2016-11-10 17:30 +0100
                Re: [PATCH] perf/core: introduce context per CPU event list Mark Rutland <mark.rutland@arm.com> - 2016-11-10 18:10 +0100

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