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

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Message-ID: <Yd8Vpo/I7LiMyfI6@kernel.org>
Date:   Wed, 12 Jan 2022 14:53:42 -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 02:45:07PM -0300, Arnaldo Carvalho de Melo escreveu:
> 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]$

Ok, I have that one now on, but could Andi or somebody else that works
more frequently with that code provide an Acked-by or Reviewed-by?

- Arnaldo
 
> - 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

-- 

- Arnaldo