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

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Message-ID: <20180301180805.GI21543@tassilo.jf.intel.com>
Date:   Thu, 1 Mar 2018 10:08:05 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     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 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.

-Andi