linux-kernel - Re: [PATCH 02/20] perf env: fix sibling

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Date:   Fri, 16 Jul 2021 15:13:37 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Kan Liang <kan.liang@...ux.intel.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 02/20] perf env: fix sibling_dies memory leak

Hi Arnaldo,

thanks for reviewing this patchset and, more importantly, for manually adding
all Fixes: tags. I'm so sorry for that.

On Thu, 2021-07-15 at 16:49 -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jul 15, 2021 at 06:07:07PM +0200, Riccardo Mancini escreveu:
> > ASan reports a memory leak in perf_env while running the perf test
> > "41: Session topology", caused by sibling_dies not being freed.
> > 
> > This patch adds the required free.
>  
> > Fixes: acae8b36cded0ee6 ("perf header: Add die information in CPU topology")
> 
> So, I CC the author of the patch and its committer, using this shell
> script:
> 
>   $ cat ~/bin/fixes
>   #!/bin/bash
>   
>   cset=$1
>   if [ $# -eq 0 ] ; then
>         read cset
>   fi
>   git show --pretty=fuller $cset | grep '^\(Author\|Commit\): ' | sed -r
> 's/.*: +/Cc: /g' | grep -v "Arnaldo Carvalho de Melo" | sort -u
>   echo Fixes: `git one $cset`
>   $
>   $ grep one -B1 ~/.gitconfig
>   [alias]
>         one = show -s --pretty='format:%h (\"%s\")'
>   $
>   $ fixes acae8b36cded0ee6
>   Cc: Kan Liang <kan.liang@...ux.intel.com>
>   Fixes: acae8b36cded0ee6 ("perf header: Add die information in CPU topology")
>   $
> 
> Normally I copy the cset SHA and, in vim, select it and run !fixes, i.e.
> 
> :'<,'>!fixes

Thanks! I've added this nice script to my PATH. :)

Thanks,
Riccardo

> 
> Thanks, applied.
> 
> - Arnaldo
> 
> > Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> > ---
> >  tools/perf/util/env.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> > index ebc5e9ad35db21d1..6c765946ef6f591c 100644
> > --- a/tools/perf/util/env.c
> > +++ b/tools/perf/util/env.c
> > @@ -186,6 +186,7 @@ void perf_env__exit(struct perf_env *env)
> >         zfree(&env->cpuid);
> >         zfree(&env->cmdline);
> >         zfree(&env->cmdline_argv);
> > +       zfree(&env->sibling_dies);
> >         zfree(&env->sibling_cores);
> >         zfree(&env->sibling_threads);
> >         zfree(&env->pmu_mappings);
> > -- 
> > 2.31.1
> > 
>