linux-kernel - Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on PMI-less hardware counter

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Message-ID: <1289521964.8148.1388.camel@rui>
Date:	Fri, 12 Nov 2010 08:32:44 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Lin, Ming M" <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Matt Fleming <matt@...sole-pimps.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on
 PMI-less hardware counter

On Thu, 2010-11-11 at 20:46 +0800, Peter Zijlstra wrote:
> On Thu, 2010-11-11 at 10:00 +0800, Zhang Rui wrote:
> > Well, the RAPL package energy perf event may need this piece of code.
> > 
> >  "MSR_PKG_ENERGY_STATUS is a read-only MSR. It reports the actual energy
> > use for the package domain. This MSR is updated every ~1msec. It has a
> > wraparound time of around 60 secs when power consumption is high, and
> > may be longer otherwise."
> > 
> > As it's an energy counter, we should show it in "perf stat", right?
> > As it doesn't have interrupt, I want to schedule a timer interrupt every
> > 30s to update the event counter. 
> 
> So use a timer inside the RAPL pmu driver. No need to change the
> interface or add generic code.

Okay.
I was wondering if this can be done with the current perf framework.
If not, surely I'm okay with using a timer inside RAPL driver. :)

thanks,
rui


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