linux-kernel - Re: [PATCH v2 11/11] perf test: add expr test for pmu metrics

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Date:   Thu, 23 Apr 2020 07:22:13 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Haiyan Song <haiyanx.song@...el.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Paul Clarke <pc@...ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 11/11] perf test: add expr test for pmu metrics

On Thu, Apr 23, 2020 at 4:29 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Wed, Apr 22, 2020 at 03:04:30PM -0700, Ian Rogers wrote:
>
> SNIP
>
> > +
> > +static int pmu_tests(void)
> > +{
> > +     struct pmu_events_map *map;
> > +     struct pmu_event *pe;
> > +     int i, j, k;
> > +     const char **ids;
> > +     int idnum;
> > +     int ret = 0;
> > +     struct expr_parse_ctx ctx;
> > +     double result;
> > +
> > +     i = 0;
> > +     for (;;) {
> > +             map = &pmu_events_map[i++];
> > +             if (!map->table) {
> > +                     map = NULL;
> > +                     break;
> > +             }
> > +             j = 0;
> > +             for (;;) {
> > +                     pe = &map->table[j++];
> > +                     if (!pe->name && !pe->metric_group && !pe->metric_name)
> > +                             break;
> > +                     if (!pe->metric_expr)
> > +                             continue;
>
> so we go throught all the metrics for the current cpu
> and test the parsing on them.. great!

It's not just the current CPU (such as skylake) it is every map
(skylake, cascade lake, etc), but this only works for the architecture
that jevents built.
If jevents built all architectures then this could check them as well.
Perhaps there should be a jevents test suite, but I think even then
this test has value.
A worthy addition to this is checking that the events within the
expression parse, but this is good progress and worth landing.

Thanks,
Ian

> thanks,
> jirka
>