Re: [PATCH v2 1/2] perf tools: add event modifier to requestexclusive PMU access

From: Andi Kleen
Date: Mon Oct 22 2012 - 09:53:49 EST

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.

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