Message-ID: <557AB5D1.9050905@intel.com>
Date: Fri, 12 Jun 2015 13:34:57 +0300
From: Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki 
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To: David Ahern <dsahern@gmail.com>
CC: Peter Zijlstra <peterz@infradead.org>, Andi Kleen <ak@linux.intel.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Ingo Molnar <mingo@kernel.org>, linux-kernel@vger.kernel.org,
        Jiri Olsa <jolsa@redhat.com>, Stephane Eranian <eranian@google.com>,
        mathieu.poirier@linaro.org, Pawel Moll <pawel.moll@arm.com>
Subject: Re: [RFC PATCH] perf: Add PERF_RECORD_SWITCH to indicate context
 switches
References: <1433859670-10806-1-git-send-email-adrian.hunter@intel.com> <20150611141548.GW19282@twins.programming.kicks-ass.net> <557A2C14.4010804@gmail.com>
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On 12/06/15 03:47, David Ahern wrote:
> 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.

So what do you want that is different different from
PERF_COUNT_SW_CONTEXT_SWITCHES? And why?

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