linux-kernel - Re: [PATCH 1/3] perf tools: Allow to build with -ltcmalloc

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Message-ID: <20191014140137.GA19627@kernel.org>
Date:   Mon, 14 Oct 2019 11:01:37 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH 1/3] perf tools: Allow to build with -ltcmalloc

Em Sun, Oct 13, 2019 at 06:33:22PM -0700, Andi Kleen escreveu:
> > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> > index a099a8a89447..8f1ba986d3bf 100644
> > --- a/tools/perf/Makefile.perf
> > +++ b/tools/perf/Makefile.perf
> > @@ -114,6 +114,8 @@ include ../scripts/utilities.mak
> >  # Define NO_LIBZSTD if you do not want support of Zstandard based runtime
> >  # trace compression in record mode.
> >  #
> > +# Define TCMALLOC to enable tcmalloc heap profiling.
> 
> It might be useful for more than just profiling. I found that gcc runs a
> few percent faster with tcmalloc for some workloads. Maybe the same is
> true for perf too, as sometimes it does a lot of mallocs.

Thanks, applied. Waiting for the conclusion of the discussion about JIT,
etc to look at the rest.

- Arnaldo