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From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>,
	Paul Mackerras <paulus@samba.org>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] [PATCH] perf: Attaching an event to a specific PMU
Date: Wed, 6 Jul 2011 19:15:59 +0200	[thread overview]
Message-ID: <20110706171559.GA14208@elte.hu> (raw)
In-Reply-To: <1309972481.3282.319.camel@twins>


* Peter Zijlstra <a.p.zijlstra@chello.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

  reply	other threads:[~2011-07-06 17:16 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-03 15:04 [RFC] [PATCH] perf: Attaching an event to a specific PMU Robert Richter
2011-07-03 18:04 ` Peter Zijlstra
2011-07-04 17:59   ` Robert Richter
2011-07-05  8:51     ` Peter Zijlstra
2011-07-05  9:12       ` Ingo Molnar
2011-07-06 16:53         ` Robert Richter
2011-07-06 17:10           ` Ingo Molnar
2011-07-06 17:14             ` Peter Zijlstra
2011-07-06 17:15               ` Ingo Molnar [this message]
2011-07-07 10:22             ` Robert Richter
2011-07-06 17:12           ` Peter Zijlstra
2011-07-07  9:21             ` Robert Richter
2011-07-07  9:39               ` Robert Richter
2011-07-07 19:38               ` Peter Zijlstra
2011-07-05  9:47     ` [PATCH] perf: Extend attr check to allow also dynamically generated Robert Richter
2011-07-05 10:51       ` Peter Zijlstra
2011-07-05 10:56         ` Robert Richter
2011-07-05 10:53     ` [PATCH] perf: Extend attr check to allow also dynamically generated types Robert Richter

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