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

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Message-ID: <6a059272-2514-4dd9-a616-8eef69d1511b@email.android.com>
Date:	Wed, 13 Jun 2012 06:22:22 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Borislav Petkov <bp@...64.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

I don't remember the exact details of the old interface but yes... seems like every "improvement" has just made it a worse mess.

Peter Zijlstra <peterz@...radead.org> wrote:

>On Tue, 2012-06-12 at 13:42 -0700, H. Peter Anvin wrote:
>> And yes, I would prefer a single sysfs file,
>> or better yet a plain old device node. 
>
>So how about we rip out all this sysfs crap and go back to
>MICROCODE_OLD_INTERFACE ? Afaict that's relatively sane.

-- 
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