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

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Message-ID: <557A2C14.4010804@gmail.com>
Date:	Thu, 11 Jun 2015 18:47:16 -0600
From:	David Ahern <dsahern@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Adrian Hunter <adrian.hunter@...el.com>
CC:	Andi Kleen <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	mathieu.poirier@...aro.org, Pawel Moll <pawel.moll@....com>
Subject: Re: [RFC PATCH] perf: Add PERF_RECORD_SWITCH to indicate context
 switches

On 6/11/15 8:15 AM, Peter Zijlstra wrote:
>> This new PERF_RECORD_SWITCH event does not have those problems
>> and it also has a couple of other small advantages. It is
>> easier to use because it is an auxiliary event (like mmap,
>> comm and task events) which can be enabled by setting a single
>> bit. It is smaller than sched:sched_switch and easier to parse.
>
> Right, so the one wee problem I have is that this only provides sched_in
> data, I imagine people might be interested in sched_out as well.

Yes and with the option of collecting callchains for sched_out.

David
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