linux-kernel - Re: perf with precise attribute kills all KVM based VMs

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Date:	Sun, 15 Jul 2012 19:51:48 -0600
From:	David Ahern <dsahern@...il.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>, Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs

On 7/12/12 10:13 AM, Gleb Natapov wrote:
> On Thu, Jul 12, 2012 at 07:06:35PM +0300, Gleb Natapov wrote:
>>>
>>> So, is the idea of your patch to not enable the PEBS in guest mode?
>>>
>> Yes, the idea of my patch is to disable PEBS and the guest entry.
>>
> BTW what is you host cpu? My patch works only for those that have global
> control register to disable PMU events, but that should cover most of
> moder cpus.

So far all tests have been done on an HP with 2 Nehalem processors 
(E5540); I have another server with a couple of Westmere's (E5620) that 
I will test at some point.

David
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