linux-kernel - Re: [PATCH 04/11] perf test: Fix cpu and thread map leaks in sw_clock

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Date:   Tue, 2 Mar 2021 14:03:05 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>, Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH 04/11] perf test: Fix cpu and thread map leaks in
 sw_clock_freq test

On Tue, Mar 02, 2021 at 10:50:15AM +0900, Namhyung Kim wrote:

SNIP

> > >               err = -ENOMEM;
> > >               pr_debug("Not enough memory to create thread/cpu maps\n");
> > > -             goto out_free_maps;
> > > +             goto out_delete_evlist;
> > >       }
> > >
> > >       perf_evlist__set_maps(&evlist->core, cpus, threads);
> > >
> > > -     cpus    = NULL;
> > > -     threads = NULL;
> >
> > hum, so IIUC we added these and the other you remove in your patches long time ago,
> > because there was no refcounting at that time, right?
> 
> It seems my original patch just set the maps directly.
> 
>   bc96b361cbf9 perf tests: Add a test case for checking sw clock event frequency
> 
> And after that Adrian changed it to use the set_maps() helper.
> 
>   c5e6bd2ed3e8 perf tests: Fix software clock events test setting maps

ok, and after that there's this one:
  a55e56637613 perf evlist: Reference count the cpu and thread maps at set_maps()

forcing the get calls when storing cpus and threads

for the patchset

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> 
> It seems we already had the refcounting at the moment.  And then the libperf
> renaming happened later.
> 
> Thanks,
> Namhyung
>