linux-kernel - Re: [RFC PATCH] perf pmu-events: Don't lower case MetricExpr

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Date:   Wed, 12 Jan 2022 14:45:07 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.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,
        eranian@...gle.com
Subject: Re: [RFC PATCH] perf pmu-events: Don't lower case MetricExpr

Em Wed, Jan 12, 2022 at 09:22:51AM -0800, Ian Rogers escreveu:
> On Thu, Nov 25, 2021 at 11:13 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > This patch changes MetricExpr to be written out in the same case. This
> > enables events in metrics to use modifiers like 'G' which currently
> > yield parse errors when made lower case. To keep tests passing the
> > literal #smt_on is compared in a non-case sensitive way - #SMT_on is
> > present in at least SkylakeX metrics.
> 
> Ping.

I tried applying 20211124001231.3277836-1-irogers@...gle.com on top of
your perf_cpu series, it failed, will check.

BTW, I got the two other patches in that series:

⬢[acme@...lbox perf]$ git log --oneline -2
6dd8646939a770e4 (HEAD -> perf/core) perf tools: Probe non-deprecated sysfs path 1st
0ce05781f4905fcf perf tools: Fix SMT fallback with large core counts
⬢[acme@...lbox perf]$

- Arnaldo
 
> Thanks,
> Ian
> 
> > This patch is on top of:
> > https://lore.kernel.org/lkml/20211124001231.3277836-1-irogers@google.com/
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/pmu-events/jevents.c | 2 --
> >  tools/perf/util/expr.c          | 2 +-
> >  2 files changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> > index 2e7c4153875b..1a57c3f81dd4 100644
> > --- a/tools/perf/pmu-events/jevents.c
> > +++ b/tools/perf/pmu-events/jevents.c
> > @@ -672,8 +672,6 @@ static int json_events(const char *fn,
> >                                 addfield(map, &je.metric_constraint, "", "", val);
> >                         } else if (json_streq(map, field, "MetricExpr")) {
> >                                 addfield(map, &je.metric_expr, "", "", val);
> > -                               for (s = je.metric_expr; *s; s++)
> > -                                       *s = tolower(*s);
> >                         } else if (json_streq(map, field, "ArchStdEvent")) {
> >                                 addfield(map, &arch_std, "", "", val);
> >                                 for (s = arch_std; *s; s++)
> > diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> > index cdbab4f959fe..5cd6b9ff2489 100644
> > --- a/tools/perf/util/expr.c
> > +++ b/tools/perf/util/expr.c
> > @@ -397,7 +397,7 @@ double expr__get_literal(const char *literal)
> >         static struct cpu_topology *topology;
> >         double result = NAN;
> >
> > -       if (!strcmp("#smt_on", literal)) {
> > +       if (!strcasecmp("#smt_on", literal)) {
> >                 result =  smt_on() > 0 ? 1.0 : 0.0;
> >                 goto out;
> >         }
> > --
> > 2.34.0.rc2.393.gf8c9666880-goog
> >

-- 

- Arnaldo