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Date: Thu, 19 Aug 2010 08:54:10 +0100
From: Matt Fleming <matt@console-pimps.org>
To: Lin Ming <ming.m.lin@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>, "Zhang, Rui" <rui.zhang@intel.com>,
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        "Brown, Len" <lenb@kernel.org>, Matthew Garrett <mjg59@srcf.ucam.org>
Subject: Re: [RFC PATCH 0/3] perf: show package power consumption in perf
Message-ID: <20100819075410.GA25755@console-pimps.org>
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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.

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?