linux-kernel - Re: [PATCH 1/5] perf bench: add event synthesis benchmark

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Message-ID: <20200402134117.GK2518490@krava>
Date:   Thu, 2 Apr 2020 15:41:17 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Andrey Zhizhikin <andrey.z@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/5] perf bench: add event synthesis benchmark

On Wed, Apr 01, 2020 at 04:39:41PM -0700, Ian Rogers wrote:
> Event synthesis may occur at the start or end (tail) of a perf command.
> In system-wide mode it can scan every process in /proc, which may add
> seconds of latency before event recording. Add a new benchmark that
> times how long event synthesis takes with and without data synthesis.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

awesome, please put the command line example in changelog

jirka