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Subject: Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event_init
From: Lin Ming <ming.m.lin@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, Frederic Weisbecker <fweisbec@gmail.com>,
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       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
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       Russell King <rmk+kernel@arm.linux.org.uk>,
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Date: Mon, 10 May 2010 18:17:50 +0800
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On Mon, 2010-05-10 at 17:40 +0800, Peter Zijlstra wrote:
> On Mon, 2010-05-10 at 17:26 +0800, Lin Ming wrote:
> > +static struct pmu *perf_event_lookup_pmu(struct perf_event *event)
> > +{
> > +       struct pmu *pmu;
> > +       int pmu_id = event->attr.pmu_id;
> > +
> > +       list_for_each_entry(pmu, &pmus, entry) {
> > +               if (pmu->id == pmu_id)
> > +                       return pmu;
> > +       }
> > +
> > +       return NULL;
> > +}
> 
> > +void perf_event_register_pmu(struct pmu *pmu)
> > +{
> > +       pmu->id = pmu_id_curr++;
> > +       list_add_tail(&pmu->entry, &pmus);
> > +} 
> 
> That will be wanting some sort of synchronization

Will add a mutex to protect the list of pmus.