Messages in this thread | | | Date | Mon, 22 Oct 2012 06:53:58 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH v2 1/2] perf tools: add event modifier to request exclusive PMU access |
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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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