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Date: Mon, 7 Dec 2015 11:26:51 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Ingo Molnar <mingo@...nel.org> Cc: vincent.weaver@...ne.edu, jolsa@...hat.com, torvalds@...ux-foundation.org, eranian@...gle.com, tglx@...utronix.de, acme@...hat.com, ak@...ux.intel.com, linux-kernel@...r.kernel.org, hpa@...or.com, linux-tip-commits@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...radead.org> Subject: Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp On Mon, Dec 07, 2015 at 07:48:41AM +0100, Ingo Molnar wrote: > > * Peter Zijlstra <peterz@...radead.org> wrote: > > > On Sun, Dec 06, 2015 at 02:11:02PM +0100, Ingo Molnar wrote: > > > > > Also, I'm not convinced we need a new 'ppp' qualifier for any of this, why not > > > just replace 'pp' with this event - 'pp' is meant to be our most precise > > > event. > > > > I requested this because the PREC_DIST events can only be scheduled on a single > > counter, whereas the existing :pp events can be had on all 4. > > > > This mean you can have 2 concurrent :pp users (without RR), but not :ppp. > > Ok. Will tooling do the right thing? I.e. will the first user of 'perf top' get > :ppp automatically, while the second one falls back to :pp? if not I'll make it so. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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