linux-kernel - Re: [PATCH 00/12] perf: introduce model specific events and AMD IBS

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Date:	Thu, 15 Apr 2010 09:44:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/12] perf: introduce model specific events and AMD IBS

On Tue, 2010-04-13 at 22:23 +0200, Robert Richter wrote:
> This patch series introduces model specific events and impments AMD
> IBS (Instruction Based Sampling) for perf_events.

I would much rather it uses the ->precise thing PEBS also uses,
otherwise we keep growing funny arch extensions and end up with a
totally fragmented trainwreck of an ABI.

> The general approach is to introduce a flag to mark an event as model
> specific. With that flag set a model specific ibs (raw) config value
> can be passed to the pmu for setup. When there are ibs samples
> available, it is sent back as a raw data sample to the userland. So we
> have a raw config value and raw sampling data. This requires the
> userland to setup ibs and further extract and process sampling data.
> 
> Patches 1-8 rework and refactor the code to prepare the ibs
> implementation. This is done in patches 9-12.
> 
> I will add ibs example code to libpfm4.

Please add a valid usecase to tools/perf/ instead.

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