linux-kernel - Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

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Message-ID: <20120612171734.GI8404@aftab.osrc.amd.com>
Date:	Tue, 12 Jun 2012 19:17:34 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, mingo@...e.hu, ming.m.lin@...el.com,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on
 SandyBridge

On Tue, Jun 12, 2012 at 07:13:23PM +0200, Peter Zijlstra wrote:
> > That's what I had in my original version.
> 
> Right, but you really need to check all cpus, not just the one you
> happen to run on or the boot cpu.

Ok, the answer to that question is whether sandybridge can support mixed
ucode revisions or not. If not, you only need to check the current cpu
you're on.

-- 
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Boris.

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