linux-kernel - [RFC PATCH 0/3] perf: show package power consumption in perf

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Date:	Wed, 18 Aug 2010 15:59:10 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	peterz@...radead.org
Cc:	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	robert.richter@....com, acme@...hat.com, paulus@...ba.org,
	dzickus@...hat.com, gorcunov@...il.com, fweisbec@...il.com,
	Lin Ming <ming.m.lin@...el.com>,
	"Brown, Len" <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Zhang, Rui" <rui.zhang@...el.com>
Subject: [RFC PATCH 0/3] perf: show package power consumption in perf

Hi, all,

RAPL(running average power limit) is a new feature which provides
mechanisms to enforce power consumption limit, on some new processors.

Generally speaking, by using RAPL, OS can set a power budget in a
certain time window, and let Hardware to throttle the processor
P/T-state to meet this energy limitation.

RAPL also provides a new MSR, i.e. MSR_PKG_ENERGY_STATUS, which reports
the total amount of energy consumed by the package.

I'm not sure if to support RAPL or not, but anyway, it sounds like a
good idea to export the energy status in perf.

So a new perf pmu and event to show the package energy consumed is
introduced in this patch.

Here is what I get after applying the three patches,

#./perf stat -e energy test
Performance counter stats for 'test':

	202	Joules cost by package
7.926001238	seconds time elapsed

Note that this patch set is made based on Peter's perf-pmu branch,
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-perf.git
 which provides better interfaces to register/unregister a new pmu.

any comment are welcome. :)

thanks,
rui

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