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