linux-kernel - Re: [RFC PATCH] perf: Add PERF_RECORD_SWITCH to indicate context switches

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Message-ID: <557AED21.30403@gmail.com>
Date:	Fri, 12 Jun 2015 08:30:57 -0600
From:	David Ahern <dsahern@...il.com>
To:	Pawel Moll <pawel.moll@....com>,
	Adrian Hunter <adrian.hunter@...el.com>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	"mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>
Subject: Re: [RFC PATCH] perf: Add PERF_RECORD_SWITCH to indicate context
 switches

On 6/12/15 7:28 AM, Pawel Moll wrote:
>> Thanks, that's clear then.  There will just need to be a flag to indicate
>> whether it is scheduling in or out.
>
> Just a thought: wouldn't it be good to know what CPU have we been
> scheduled from/to? This kind of information would be especially valuable
> in heterogeneous systems.

yes that is essential.

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