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Date: Thu, 6 Aug 2015 18:52:35 +0000 From: "Liang, Kan" <kan.liang@...el.com> To: Stephane Eranian <eranian@...gle.com>, Peter Zijlstra <peterz@...radead.org> CC: "mingo@...hat.com" <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, "ak@...ux.intel.com" <ak@...ux.intel.com>, LKML <linux-kernel@...r.kernel.org> Subject: RE: [PATCH V2 1/1] perf/x86: Add Intel power cstate PMUs support > >> +static cpumask_t power_cstate_core_cpu_mask; > > > > That one typically does not need a cpumask. > > > You need to pick one CPU out of the multi-core. But it is for client parts > thus there is only one socket. At least this is my understanding. > CORE_C*_RESIDENCY are available for physical processor core. So logical processor in same physical processor core share the same counter. I think we need the cpumask to identify the default logical processor which do counting. > > > I understand that these metrics are useful and needed however if I look at > the broader picture I see many PMUs doing similar things or appearing > different when they are actually very close. It would be nice to have a > more unified approach. You have RAPL (client, server) which appears as > the power PMU. You have the PCU uncore on servers which also provides > C-state residency info. Yet, all these appear differently and expose events > with different names. > I think we could benefit from a more unifie approach here such that you > would be able to do > > $ perf stat -a -e power/c6-residency/, power/energy-pkg/ > > on client and server without having to change the pmu name of the event > names. Yes, I agree. I'll think about it. Thanks, Kan
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