linux-kernel - Re: [RFC PATCH] perf/core: exposing type of context-switch-out event

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Date:   Thu, 01 Mar 2018 20:19:47 +0100
From:   Milian Wolff <milian.wolff@...b.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>
Subject: Re: [RFC PATCH] perf/core: exposing type of context-switch-out event

On Donnerstag, 1. März 2018 19:08:05 CET Andi Kleen wrote:
> On Thu, Mar 01, 2018 at 06:40:04PM +0300, Alexey Budankov wrote:
> > Hi,
> > 
> > This patch prototypes exposing the type of context-switch-out event using
> > PERF_RECORD_MISC_EXT_RESERVED bit for PERF_RECORD_SWITCH[_CPU_WIDE]
> > records.
> It would be better to define an actually named bit in perf_event.h.
> It can be the same value.
> 
> Also we would need a patch for perf script / perf report -D to print this
> information.
> 
> The rest looks good to me.

Please also add documentation Documentation/perf.data-file-format.txt, but I 
just noticed that not even PERF_RECORD_SWITCH is documented there...

Otherwise I also think that this would be a very nice feature addition!

-- 
Milian Wolff | milian.wolff@...b.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
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