Messages in this thread | | | Date | Mon, 7 Dec 2015 07:48:41 +0100 | From | Ingo Molnar <> | Subject | Re: [tip:perf/core] perf/x86: Use INST_RETIRED.PREC_DIST for cycles: ppp |
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* Peter Zijlstra <peterz@infradead.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?
Thanks,
Ingo
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