linux-kernel - Re: [RFC] perf x86 intel: Question about pebs_data

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Message-ID: <20151114194056.GP3533@two.firstfloor.org>
Date:	Sat, 14 Nov 2015 20:40:56 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Don Zickus <dzickus@...hat.com>, Joe Mario <jmario@...hat.com>
Subject: Re: [RFC] perf x86 intel: Question about pebs_data_source data

> I'm probably misunderstanding SDM (wouldn't be the first time) what do I miss?

Hi Jiri,

We checked the history, and it appears the SDM was not updated when the
definition of the bits changed (around Sandy Bridge, possibly Westmere).
So perf is correct for newer CPUs, but not for older, and we have to fork
the table. I'll work on a patch and also see that the SDM gets fixed.

-Andi
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