linux-kernel - Re: [PATCH V6 0/13] perf: Intel uncore pmu counting support

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Message-ID: <CABPqkBTi8-yKg_kzFTwLe1_m2Zprt5vGk9WPQW14yHQpy=PiWw@mail.gmail.com>
Date:	Thu, 21 Jun 2012 10:10:12 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...e.hu,
	jolsa@...hat.com, andi@...stfloor.org,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH V6 0/13] perf: Intel uncore pmu counting support

On Thu, Jun 21, 2012 at 4:34 AM, Yan, Zheng <zheng.z.yan@...el.com> wrote:
> On 06/21/2012 12:01 AM, Peter Zijlstra wrote:
>>
>> ok, so with this stuff something like:
>>
>>   perf stat -ae uncore/event=clockticks/ foo
>>
>> will register a counter per cpu, which is somewhat silly since we only
>> need one per node. What would be the best way to 'fix' this?
>>
>> We could of course create another variant of -a which iterates nodes
>> instead of cpus, -N or so.
>>
>> Alternatively we could try and describe this in sysfs in some way, one
>> possibility would be to include a link to /sys/devices/system/{cpu,node}
>> or somesuch and use that link to iterate the correct space.
>>
>> Any other suggestions?
>>
> How about treat the 'cpu' parameter for uncore event as socket id instead
> of cpu id?
>
But that does not address the use case of Peter, i.e., no cpu parameter passed.
Looks like sysfs might be the only way to do this in a portable manner.
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