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SubjectRe: [RFC][PATCH 2/9] perf: core, remove hw_perf_event_init
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On Mon, 2010-05-10 at 18:19 +0800, Peter Zijlstra wrote:
> On Mon, 2010-05-10 at 18:17 +0800, Lin Ming wrote:
> > 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.
>
> I'm thinking RCU might be better suited, a mutex for lookup doesn't
> sound ideal.

Thanks for the idea, I'll do that.



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