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

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Message-ID: <20120612205609.GF11137@aftab.osrc.amd.com>
Date:	Tue, 12 Jun 2012 22:56:09 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, andi@...stfloor.org, mingo@...e.hu,
	ming.m.lin@...el.com, "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on
 SandyBridge

On Tue, Jun 12, 2012 at 01:42:07PM -0700, H. Peter Anvin wrote:
> I personally don't know of any valid use case for per-core loads, and
> it sounds like a horrid idea.

Vehemently agreed.

However, last time we talked about Ingo mentioned some possibility
of having different microcode versions on different CPUs:
http://lkml.indiana.edu/hypermail/linux/kernel/1105.3/00749.html

Hmm...

> And yes, I would prefer a single sysfs file, or better yet a plain old
> device node.

Also agreed.

-- 
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Boris.

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