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

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Date:	Thu, 19 Aug 2010 16:15:38 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"robert.richter@....com" <robert.richter@....com>,
	"acme@...hat.com" <acme@...hat.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"gorcunov@...il.com" <gorcunov@...il.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"Brown, Len" <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [RFC PATCH 0/3] perf: show package power consumption in perf

On Thu, 2010-08-19 at 15:54 +0800, Matt Fleming wrote:
> On Thu, Aug 19, 2010 at 11:28:17AM +0800, Lin Ming wrote:
> > On Wed, 2010-08-18 at 20:41 +0800, Matt Fleming wrote:
> > > 
> > > I had a quick look over the patches and Peter is right - the group
> > > events stuff would probably fit quite well here. Unfortunately, due to
> > > holidays and things, I haven't been able to get them finished
> > > yet. I'll get on that ASAP.
> > 
> > Hi, Matt
> > 
> > What's the "group events stuff"?
> > Is there some discussion on LKML or elsewhere I can have a look at?
> > 
> > Thanks,
> > Lin Ming
> 
> The relevant information can be found here in this thread,
> http://lkml.org/lkml/2010/8/4/174. I'm working on some patches for
> this but they're not finished yet. I can probably get something to
> show by next week.

Thanks.

> 
> The discussion started because the performance counters on SH do not
> generate an interrupt on overflow, so we need to periodically sample
> them. Am I correct in thinking that the energy counters also do not
> generate an interrupt on overflow and that's why you wrote the event
> as a software event?

I think so.

Rui, could you confirm this?


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