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

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Message-ID: <20100421182629.GE6450@erda.amd.com>
Date:	Wed, 21 Apr 2010 20:26:29 +0200
From:	Robert Richter <robert.richter@....com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/12] perf: introduce model specific events and AMD IBS

On 21.04.10 15:21:35, Stephane Eranian wrote:
> Okay, so you're suggesting everything is exposed via PERF_SAMPLE_REGS.
> PEBS does capture machine state which is easily mapped onto PERF_SAMPLE_REGS.
> Well, that's until you look at PEB-LL on Nehalem where is captures
> latencies and data
> addresses.
>
> Those could be funneled through PERF_SAMPLE_REGS
> as well, I believe. But that means, PERF_SAMPLE_REGS would need some
> configuration
> bitmask to name the registers of interest, e.g. EAX, EDX, IBSOP_DATA,
> IBSOP_PHYSAD,
> and so on.

What is the idea of PERF_SAMPLE_REGS? A git grep PERF_SAMPLE_REGS only
returns a single line in -tip. I know nothing about it.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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