linux-kernel - Re: [PATCH] perf tools: Speed up report for perf compiled with linwunwind

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Message-ID: <20190502131310.GG21436@kernel.org>
Date:   Thu, 2 May 2019 09:13:10 -0400
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     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>
Subject: Re: [PATCH] perf tools: Speed up report for perf compiled with
 linwunwind

Em Fri, Apr 26, 2019 at 09:38:04AM +0200, Jiri Olsa escreveu:
> When compiled with libunwind, perf does some preparatory work
> when processing side-band events. This is not needed when report
> actually don't unwind dwarf callchains, so it's disabled with
> dwarf_callchain_users bool.
> 
> However we could move that check to higher level and shield more
> unwanted code for normal report processing, giving us following
> speed up on kernel build profile:

Thanks, applied to perf/core.

- Arnaldo