linux-kernel - Re: [PATCH v2 0/7] PMU performance improvements

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Date:   Tue, 17 Oct 2023 12:55:29 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, Ian Rogers <irogers@...gle.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Mike Leach <mike.leach@...aro.org>,
        Yang Jihong <yangjihong1@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>,
        John Garry <john.g.garry@...cle.com>,
        James Clark <james.clark@....com>,
        Will Deacon <will@...nel.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        coresight@...ts.linaro.org, Ingo Molnar <mingo@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Richter <tmricht@...ux.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 0/7] PMU performance improvements

On Thu, 12 Oct 2023 10:56:38 -0700, Ian Rogers wrote:
> Performance improvements to pmu scanning by holding onto the
> event/metric tables for a cpuid (avoid regular expression comparisons)
> and by lazily computing the default perf_event_attr for a PMU.
> 
> Before
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 251.990 usec (+- 4.009 usec)
>   Average PMU scanning took: 3222.460 usec (+- 211.234 usec)
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 260.120 usec (+- 7.905 usec)
>   Average PMU scanning took: 3228.995 usec (+- 211.196 usec)
> % Running 'internals/pmu-scan' benchmark:
> Computing performance of sysfs PMU event scan for 100 times
>   Average core PMU scanning took: 252.310 usec (+- 3.980 usec)
>   Average PMU scanning took: 3220.675 usec (+- 210.844 usec)
> 
> [...]

Applied to perf-tools-next, thanks!