linux-kernel - Re: [PATCH v3 03/11] perf record: Early auxtrace initialization before event parsing

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Date:   Wed, 8 Mar 2023 13:22:52 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Qi Liu <liuqi115@...wei.com>,
        Kim Phillips <kim.phillips@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 03/11] perf record: Early auxtrace initialization
 before event parsing

On Wed, Mar 8, 2023 at 12:32 PM Liang, Kan <kan.liang@...ux.intel.com> wrote:
>
>
>
> On 2023-03-08 3:17 a.m., Ian Rogers wrote:
> > This allows event parsing to use the evsel__is_aux_event function,
> > which is important when determining event grouping.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/arch/x86/util/auxtrace.c | 17 +++++++++++++----
> >  tools/perf/builtin-record.c         |  6 ++++++
> >  tools/perf/util/auxtrace.h          |  2 ++
> >  3 files changed, 21 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/perf/arch/x86/util/auxtrace.c b/tools/perf/arch/x86/util/auxtrace.c
> > index 3da506e13f49..de1e4842ea2e 100644
> > --- a/tools/perf/arch/x86/util/auxtrace.c
> > +++ b/tools/perf/arch/x86/util/auxtrace.c
> > @@ -15,6 +15,19 @@
> >  #include "../../../util/intel-bts.h"
> >  #include "../../../util/evlist.h"
> >
> > +void auxtrace__early_init(void)
> > +{
> > +     struct perf_pmu *intel_pt_pmu;
> > +     struct perf_pmu *intel_bts_pmu;
> > +
> > +     intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
> > +     if (intel_pt_pmu)
> > +             intel_pt_pmu->auxtrace = true;
> > +     intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
> > +     if (intel_bts_pmu)
> > +             intel_bts_pmu->auxtrace = true;
> > +}
> > +
> >  static
> >  struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
> >                                                   int *err)
> > @@ -26,11 +39,7 @@ struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
> >       bool found_bts = false;
> >
> >       intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
> > -     if (intel_pt_pmu)
> > -             intel_pt_pmu->auxtrace = true;
> >       intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
> > -     if (intel_bts_pmu)
> > -             intel_bts_pmu->auxtrace = true;
> >
> >       evlist__for_each_entry(evlist, evsel) {
> >               if (intel_pt_pmu && evsel->core.attr.type == intel_pt_pmu->type)
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index 8374117e66f6..a0870c076dc0 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -3940,6 +3940,10 @@ static int record__init_thread_masks(struct record *rec)
> >       return ret;
> >  }
> >
> > +__weak void auxtrace__early_init(void)
> > +{
> > +}
> > +
>
> Does the method which Adrian suggested work for you?
>
> https://lore.kernel.org/lkml/9788f0f1-087f-7f0b-048a-0146afe1f632@intel.com/
>
> With that, we don't need to introduce another weak function.
>
> Thanks,
> Kan

Thanks Kan,

that works and I'm not sure how I missed Adrian's e-mail. I'll put it into v4.

Ian

>
> >  int cmd_record(int argc, const char **argv)
> >  {
> >       int err;
> > @@ -3985,6 +3989,8 @@ int cmd_record(int argc, const char **argv)
> >       if (err)
> >               return err;
> >
> > +     auxtrace__early_init();
> > +
> >       argc = parse_options(argc, argv, record_options, record_usage,
> >                           PARSE_OPT_STOP_AT_NON_OPTION);
> >       if (quiet)
> > diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
> > index 29eb82dff574..49a86aa6ac94 100644
> > --- a/tools/perf/util/auxtrace.h
> > +++ b/tools/perf/util/auxtrace.h
> > @@ -457,6 +457,8 @@ struct addr_filters {
> >
> >  struct auxtrace_cache;
> >
> > +void auxtrace__early_init(void);
> > +
> >  #ifdef HAVE_AUXTRACE_SUPPORT
> >
> >  u64 compat_auxtrace_mmap__read_head(struct auxtrace_mmap *mm);