linux-kernel - Re: [PATCH] perf bench: add benchmark for evlist open/close operations

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Date:   Tue, 10 Aug 2021 11:07:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Riccardo Mancini <rickyman7@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf bench: add benchmark for evlist open/close
 operations

Em Tue, Aug 10, 2021 at 11:03:22AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Aug 10, 2021 at 12:31:55PM +0200, Riccardo Mancini escreveu:
> > Unrelated to this small issue, I noticed I forgot to check the return of
> > bench__create_evlist. Would you like me to send a v2 fixing both issues or are
> > you able to apply this other small change yourself?
 
> Nah, as this is the HEAD right now in my local branch, I'll apply it
> myself, thanks!

Also you forgot another check for this same function
(bench__create_evlist()), before that loop. I'm fixing that as well.
 
> - Arnaldo
>  
> > diff --git a/tools/perf/bench/evlist-open-close.c b/tools/perf/bench/evlist-open-close.c
> > index 40bce06f5ca7bef3..f0b9c330f34f2984 100644
> > --- a/tools/perf/bench/evlist-open-close.c
> > +++ b/tools/perf/bench/evlist-open-close.c
> > @@ -168,7 +168,11 @@ static int bench_evlist_open_close__run(char *evstr)
> >  
> >         for (i = 0; i < iterations; i++) {
> >                 pr_debug("Started iteration %d\n", i);
> > +
> >                 evlist = bench__create_evlist(evstr);
> > +               if (!evlist)
> > +                       return -ENOMEM;
> > +
> >                 gettimeofday(&start, NULL);
> >                 err = bench__do_evlist_open_close(evlist);