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

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Message-ID: <1342112309.28010.14.camel@twins>
Date:	Thu, 12 Jul 2012 18:58:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	David Ahern <dsahern@...il.com>, Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs

On Thu, 2012-07-12 at 19:13 +0300, Gleb Natapov wrote:
> 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. 

That covers everything but core and p4, and I don't think we support
PEBS on either of those.

that said, you might want to also clear EN on the individual counters,
just in case the PEBS clear and DS_AREA clear aren't working.

The SDM is pretty clear on what you _should_ do to enable/disable PEBS,
doing less _might_ work but...
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