linux-kernel - Re: [RFC PATCH] perf_core: provide a kernel-internal interface to get to performance counters

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Date:	Fri, 25 Sep 2009 12:44:24 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	Prasad <prasad@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH] perf_core: provide a kernel-internal interface to
	get to performance counters

On Fri, Sep 25, 2009 at 12:25:56PM +0200, Arjan van de Ven wrote:
> From 5db5cd76f3c16c9f6093f54d1ccfb97d04b9a1ca Mon Sep 17 00:00:00 2001
> From: Arjan van de Ven <arjan@...ux.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@...ux.intel.com>



Sounds like a very good idea. I have that as an ad-hoc part in the
hw-breakpoint patchset. This patch would help me drop this part
and use such unified in-kernel users interface.

Frederic.

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