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

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Date:	Wed, 21 Apr 2010 20:40:07 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Robert Richter <robert.richter@....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 Wed, Apr 21, 2010 at 8:26 PM, Robert Richter <robert.richter@....com> wrote:
> 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.
>
You may want to collect some of the general purpose registers
(interrupted state) in each
sample. This is what you get today in a signal handler (ucontext) for
instance. That may
also be a way to export PEBS samples.
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