linux-kernel - Re: [PATCH v1 1/6] perf parse-events: Fixes relating to no

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Date:   Sat, 2 Sep 2023 09:28:15 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/6] perf parse-events: Fixes relating to no_value terms

On Sat, Sep 2, 2023 at 4:11 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Fri, Sep 01, 2023 at 04:39:44PM -0700, Ian Rogers escreveu:
> > A term may have no value in which case it is assumed to have a value
> > of 1. It doesn't just apply to alias/event terms so change the
> > parse_events_term__to_strbuf assert.
> >
> > Commit 99e7138eb789 ("perf tools: Fail on using multiple bits long
> > terms without value") made it so that no_value terms could only be for
> > a single bit. Prior to commit 64199ae4b8a3 ("perf parse-events: Fix
> > propagation of term's no_value when cloning") this missed a test case
> > where config1 had no_value.
> >
> > Fixes: 64199ae4b8a3 ("perf parse-events: Fix propagation of term's no_value when cloning")
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> I'm trying to minimize the number of patches that aren't strict fixes
> this late in the process for v6.6, so I think I'll get just this first
> one and defer the other cleanups/improvements for v6.7, ok?

Makes sense, this is why I put the fix first in the series.

Thanks,
Ian

> Thanks,
>
> - Arnaldo
>
> > ---
> >  tools/perf/tests/parse-events.c | 2 +-
> >  tools/perf/util/parse-events.c  | 2 +-
> >  tools/perf/util/parse-events.h  | 4 ++--
> >  3 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> > index d86076d575ed..d47f1f871164 100644
> > --- a/tools/perf/tests/parse-events.c
> > +++ b/tools/perf/tests/parse-events.c
> > @@ -2170,7 +2170,7 @@ static const struct evlist_test test__events[] = {
> >
> >  static const struct evlist_test test__events_pmu[] = {
> >       {
> > -             .name  = "cpu/config=10,config1,config2=3,period=1000/u",
> > +             .name  = "cpu/config=10,config1=1,config2=3,period=1000/u",
> >               .valid = test__pmu_cpu_valid,
> >               .check = test__checkevent_pmu,
> >               /* 0 */
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 68fe2c4ff49f..65608a3cba81 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -2607,7 +2607,7 @@ int parse_events_term__to_strbuf(struct list_head *term_list, struct strbuf *sb)
> >
> >               if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
> >                       if (term->no_value) {
> > -                             assert(term->type_term == PARSE_EVENTS__TERM_TYPE_USER);
> > +                             assert(term->val.num == 1);
> >                               ret = strbuf_addf(sb, "%s", term->config);
> >                       } else
> >                               ret = strbuf_addf(sb, "%s=%#"PRIx64, term->config, term->val.num);
> > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> > index 855b0725c5d4..594e5d2dc67f 100644
> > --- a/tools/perf/util/parse-events.h
> > +++ b/tools/perf/util/parse-events.h
> > @@ -124,8 +124,8 @@ struct parse_events_term {
> >        */
> >       bool weak;
> >       /**
> > -      * @no_value: Is there no value. TODO: this should really be part of
> > -      * type_val.
> > +      * @no_value: Is there no value. If a numeric term has no value then the
> > +      * value is assumed to be 1. An event name also has no value.
> >        */
> >       bool no_value;
> >  };
> > --
> > 2.42.0.283.g2d96d420d3-goog
> >
>
> --
>
> - Arnaldo