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

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Message-ID: <20120607132801.GL27374@one.firstfloor.org>
Date:	Thu, 7 Jun 2012 15:28:01 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, andi@...stfloor.org, mingo@...e.hu,
	ming.m.lin@...el.com
Subject: Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

> This will only warn about the PEBS issue once you try and use a PEBS
> counter. Shouldn't we do this on boot? IOW. put check_pebs_quirks()

At boot the new microcode may not be loaded yet. So you have to delay
the check.

-Andi
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