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

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Message-ID: <1340208092.21745.114.camel@twins>
Date:	Wed, 20 Jun 2012 18:01:32 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	mingo@...e.hu, jolsa@...hat.com, eranian@...gle.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

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?
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