linux-kernel - Re: [PATCH v4 04/48] perf stat: Switch aggregation to use for

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Message-ID: <CAP-5=fWU+JBpqpE0ujGfs5TmnY9mv5CWNdMc=X_zKe79GTvPfw@mail.gmail.com>
Date:   Mon, 10 Jan 2022 14:22:34 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vineet Singh <vineet.singh@...el.com>,
        James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, zhengjun.xing@...el.com,
        eranian@...gle.com
Subject: Re: [PATCH v4 04/48] perf stat: Switch aggregation to use for_each loop

On Mon, Jan 10, 2022 at 10:51 AM John Garry <john.garry@...wei.com> wrote:
>
> On 05/01/2022 06:13, Ian Rogers wrote:
> > +     cpus = evsel__cpus(evsel);
> > +     perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
>
> It seems a common pattern to evaluate cpus and use in
> perf_cpu_map__for_each_cpu() - is it possible to make a macro to accept
> evsel and create cpus, like perf_evsel__for_each_cpu()?

It's possible, I'm not sure it is saving much and it is common to also
want to iterate the cpumap of the evlist.

Thanks,
Ian

> > +             if (cpu_map__compare_aggr_cpu_id(config->aggr_get_id(config, cpus, idx),
> > +                                              id))
> > +                     return cpu;
> >       }
> >       return 0;
>