Re: [PATCH 2/2] perf x86/topdown: Refine helper arch_is_topdown_metrics()
From: Ian Rogers
Date: Wed Oct 16 2024 - 13:56:32 EST
On Wed, Oct 16, 2024 at 10:37 AM Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
>
> Hi Ian,
>
> On Fri, Oct 11, 2024 at 11:02:07AM +0000, Dapeng Mi wrote:
> > Leverage the existed function perf_pmu__name_from_config() to check if
> > an event is topdown metrics event. perf_pmu__name_from_config() goes
> > through the defined formats and figures out the config of pre-defined
> > topdown events.
> >
> > This avoids to figure out the config of topdown pre-defined events with
> > hard-coded format strings "event=" and "umask=" and provides more
> > flexibility.
> >
> > Suggested-by: Ian Rogers <irogers@xxxxxxxxxx>
> > Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
>
> Are you ok with this now?
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Thanks,
Ian
> Thanks,
> Namhyung
>
> > ---
> > tools/perf/arch/x86/util/topdown.c | 39 +++++++-----------------------
> > 1 file changed, 9 insertions(+), 30 deletions(-)
> >
> > diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c
> > index cb2c64928bc4..f63747d0abdf 100644
> > --- a/tools/perf/arch/x86/util/topdown.c
> > +++ b/tools/perf/arch/x86/util/topdown.c
> > @@ -41,43 +41,22 @@ bool arch_is_topdown_slots(const struct evsel *evsel)
> > return false;
> > }
> >
> > -static int compare_topdown_event(void *vstate, struct pmu_event_info *info)
> > -{
> > - int *config = vstate;
> > - int event = 0;
> > - int umask = 0;
> > - char *str;
> > -
> > - if (!strcasestr(info->name, "topdown"))
> > - return 0;
> > -
> > - str = strcasestr(info->str, "event=");
> > - if (str)
> > - sscanf(str, "event=%x", &event);
> > -
> > - str = strcasestr(info->str, "umask=");
> > - if (str)
> > - sscanf(str, "umask=%x", &umask);
> > -
> > - if (event == 0 && *config == (event | umask << 8))
> > - return 1;
> > -
> > - return 0;
> > -}
> > -
> > bool arch_is_topdown_metrics(const struct evsel *evsel)
> > {
> > - struct perf_pmu *pmu = evsel__find_pmu(evsel);
> > int config = evsel->core.attr.config;
> > + const char *name_from_config;
> > + struct perf_pmu *pmu;
> >
> > - if (!pmu || !pmu->is_core)
> > + /* All topdown events have an event code of 0. */
> > + if ((config & 0xFF) != 0)
> > return false;
> >
> > - if (perf_pmu__for_each_event(pmu, false, &config,
> > - compare_topdown_event))
> > - return true;
> > + pmu = evsel__find_pmu(evsel);
> > + if (!pmu || !pmu->is_core)
> > + return false;
> >
> > - return false;
> > + name_from_config = perf_pmu__name_from_config(pmu, config);
> > + return name_from_config && strcasestr(name_from_config, "topdown");
> > }
> >
> > /*
> > --
> > 2.40.1
> >