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

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Message-ID: <20121022153952.GM2095@tassilo.jf.intel.com>
Date:	Mon, 22 Oct 2012 08:39:52 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v2 1/2] perf tools: add event modifier to request
 exclusive PMU access

> But maybe you're talking about a generic event exports in
> /sys/device/cpu/events.
> But why would I expose prec_dist there. And under what name?

I already exposed it in the Haswell patchkit (instructions-p)

I also exposed precise there so that some events can be forced PEBS

If you want to expose it on Sandy Bridge too you need to add the 
event to the user tool grammar, like I did for precise.

Then user can just use

perf record -e instructions-p ...

and the kernel does automagically the right thing.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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