linux-kernel - Re: [PATCH v3] perf evsel: Fix missing exclude

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Date:   Tue, 2 Nov 2021 16:08:40 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3] perf evsel: Fix missing exclude_{host,guest} setting

Hi Arnaldo,

On Mon, Nov 1, 2021 at 2:09 PM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Fri, Oct 29, 2021 at 03:49:29PM -0700, Namhyung Kim escreveu:
> > @@ -1900,10 +1935,17 @@ bool evsel__detect_missing_features(struct evsel *evsel)
> >               perf_missing_features.mmap2 = true;
> >               pr_debug2_peo("switching off mmap2\n");
> >               return true;
> > -     } else if (!perf_missing_features.exclude_guest &&
> > -                (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
> > -             perf_missing_features.exclude_guest = true;
> > -             pr_debug2_peo("switching off exclude_guest, exclude_host\n");
> > +     } else if ((evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) &&
> > +                perf_missing_features.pmu != NULL &&
> > +                !hashmap__find(perf_missing_features.pmu, evsel, NULL)) {
> > +             uintptr_t pmu_features = PERF_MISSING_PMU_EXCLUDE_GUEST;
> > +
> > +             hashmap__add(perf_missing_features.pmu, evsel, (void *)pmu_features);
>
> Can't hashmap__add() fail?

It can.  I will add a check.

Thanks,
Namhyung