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SubjectRe: [PATCH 2/2] x86, perf: Use INST_RETIRED.PREC_DIST for cycles:ppp
On Tue, Dec 01, 2015 at 02:41:51PM +0100, Peter Zijlstra wrote:
> On Mon, Nov 30, 2015 at 04:28:09PM -0800, Andi Kleen wrote:
> > diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
> > index 9dfbba5..ba41899 100644
> > --- a/arch/x86/kernel/cpu/perf_event.c
> > +++ b/arch/x86/kernel/cpu/perf_event.c
> > @@ -482,6 +482,9 @@ int x86_pmu_hw_config(struct perf_event *event)
> > /* Support for IP fixup */
> > if (x86_pmu.lbr_nr || x86_pmu.intel_cap.pebs_format >= 2)
> > precise++;
> > +
> > + if (x86_pmu.pebs_aliases)
> > + precise++;
>
> This is not accurate, it would allow :ppp for core2 for example, which
> does not at all support PREC_DIST events.
>
> Something like so on top?

Yes that's fine. Thanks.

Are you just applying it with that change, or should I resend a combined patch?

-Andi


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