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

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Message-ID: <20191014013322.GI9933@tassilo.jf.intel.com>
Date:   Sun, 13 Oct 2019 18:33:22 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...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

> 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.

-Andi