linux-kernel - Re: [PATCH v2 1/2] perf tools: add event modifier to request exclusive PMU access

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Message-ID: <20121022135358.GJ2095@tassilo.jf.intel.com>
Date:	Mon, 22 Oct 2012 06:53:58 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	acme@...hat.com, jolsa@...hat.com
Subject: Re: [PATCH v2 1/2] perf tools: add event modifier to request
 exclusive PMU access

On Mon, Oct 22, 2012 at 03:20:51PM +0200, Stephane Eranian wrote:
> This patch adds the x modifier for events. It allows users to
> request exclusive PMU access (attr->exclusive):
> 
> perf stat -e cycles:x ......
> or
> perf stat -e cpu/cycles/x ....
> 
> Exclusive mode is a feature of perf_events which was not yet
> supported by the perf tool. Some events may require exclusive
> PMU access (like on Intel SandyBridge).

You probably should add it also to be readable from sysfs

(like I did with precise in my haswell patchkit)

Then the SNB version of instructions-p can just force this 
without the user having to do anything special.

-Andi
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