linux-kernel - Re: [RFC] [PATCH] perf: Attaching an event to a specific PMU

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Date:	Wed, 6 Jul 2011 19:15:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Robert Richter <robert.richter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH] perf: Attaching an event to a specific PMU


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Wed, 2011-07-06 at 19:10 +0200, Ingo Molnar wrote:
> > 
> > I think Peter suggested it that an open() done in /sys should 
> > give us a handle to a given event?
> 
> No, more like the open of a sysfs file could also grab a refcount 
> on the module. All it would take is a custom open/close method for 
> sysfs files. Now I have no clue how to do that, but that's another 
> issue.
> 
> Also, I really don't see the point. With modular PMUs there's 
> always races against unload, just don't do that or live with it.

I don't think it's a big issue either - module load/unloads are rare.

Thanks,

	Ingo
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