Re: [PATCH 1/5] perf: Provide a proper stop action for softwareevents

From: Frederic Weisbecker
Date: Thu Jun 10 2010 - 13:04:33 EST

On Thu, Jun 10, 2010 at 06:38:34PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-06-10 at 18:29 +0200, Frederic Weisbecker wrote:
> > Imagine you have several software and hardware events running on the
> > same cpu. Each time you reset this period for a software event, you do
> > a hw_pmu_disable() / hw_pmu_enable(), which writes/read the hardware
> > register for each hardware events, amongst other wasteful things.
> hw_perf_disable/enable() are on their way out. They should be replaced
> with a struct pmu callback. We must remove all these weak functions if
> we want to support multiple pmus.

Ok, that's a good news.

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