linux-kernel - Re: perf, x86: Disable PEBS on SandyBridge chips

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Date:	Fri, 17 Feb 2012 14:12:17 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	David Ahern <dsahern@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Maarten Lankhorst <m.b.lankhorst@...il.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: perf, x86: Disable PEBS on SandyBridge chips

On 02/17/2012 02:08 PM, David Ahern wrote:
> On 2/17/12 2:40 PM, H. Peter Anvin wrote:
>> On 02/17/2012 07:12 AM, Peter Zijlstra wrote:
>>> On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
>>>> Hey Peter,
>>>>
>>>> Why is PEBS disabled? If I look at the intel_clovertown_quirks I can
>>>> see
>>>> why it's disabled for that cpu, but the sandy bridge one lacks any kind
>>>> of clarification or information on why, or how I can learn more.
>>>
>>> hpa, could you get the official Intel answer on this?
>>
>> *Where* is PEBS disabled?
>
> arch/x86/kernel/cpu/perf_event_intel.c,
> intel_sandybridge_quirk()
>

OK, this is Peter's patch and I don't think I was involved with it... I 
need more of a pointer to be able to track this down.

	-hpa


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