Subject: Re: [RFC PATCH] perf_core: provide a kernel-internal interface to
 get to performance counters
From: Peter Zijlstra <peterz@infradead.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
       Frederic Weisbecker <fweisbec@gmail.com>
In-Reply-To: <20090925122556.2f8bd939@infradead.org>
References: <20090925122556.2f8bd939@infradead.org>
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Date: Fri, 25 Sep 2009 13:42:37 +0200
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On Fri, 2009-09-25 at 12:25 +0200, Arjan van de Ven wrote:
> From 5db5cd76f3c16c9f6093f54d1ccfb97d04b9a1ca Mon Sep 17 00:00:00 2001
> From: Arjan van de Ven <arjan@linux.intel.com>
> Date: Fri, 25 Sep 2009 12:20:57 +0200
> Subject: [PATCH] perf_core: provide a kernel-internal interface to get to performance counters
> 
> There are reasons for kernel code to ask for, and use, performance counters.
> For example, in CPU freq governors this tends to be a good idea, but there
> are other examples possible as well of course.
> 
> This patch adds the needed bits to do enable this functionality; they have been
> tested in an experimental cpufreq driver that I'm working on, and the changes
> are all that I needed to access counters properly.
> 
> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

Looks fine to me, can go in when we acquire a user.


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