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

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Date:	Thu, 07 Jun 2012 13:15:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	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

On Thu, 2012-06-07 at 12:48 +0200, Stephane Eranian wrote:
> >> The warning could also be done on boot. But the check has to be done
> >>  when the event is created.
> >
> > Is this because of the ucode loader not having done its thing yet etc..?

Ah, its because you can update ucode at runtime of course.

A quick look at the ucode loader doesn't show it having a notifier
either, so then yeah we need to check on every event creation :/

Or we could put a hook in the ucode loader.
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