linux-kernel - Re: [PATCH 4/7] perf/x86-ibs: Add support for IBS pseudo events

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Message-ID: <20120507144756.GG18810@erda.amd.com>
Date:	Mon, 7 May 2012 16:47:56 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] perf/x86-ibs: Add support for IBS pseudo events

On 07.05.12 13:00:54, Peter Zijlstra wrote:
> Who again wasn't decoding anything in perf_event_attr:config* ?

attr:config is one of the ibs control msrs comparable with perfctr's
evntsel msr:

 MSRC001_1030 IBS Fetch Control Register (IbsFetchCtl)
 MSRC001_1033 IBS Execution Control Register (IbsOpCtl)

There are some options (randomisation, cycle/micro-op counting) but
usually it is null since the period is encoded in attr:period. But ibs
could be setup by an application using attr:config only which then
passes the value directly to the ctl msr.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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