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

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Message-ID: <4FFAF042.1050609@gmail.com>
Date:	Mon, 09 Jul 2012 08:52:50 -0600
From:	David Ahern <dsahern@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf with precise attribute kills all KVM based VMs

On 7/9/12 8:49 AM, Peter Zijlstra wrote:
> On Mon, 2012-07-09 at 08:47 -0600, David Ahern wrote:
>>
>> I found this testing changes to perf-kvm, but found the problem extends
>> to just perf-record. With perf-record exclude_guest defaults to 1. See
>> tools/perf/util/util.c, event_attr_init().
>
> You lost me there.. so perf-record defaults to exclude_guest=1 (which
> would make the proposed patch I just send actually possible), but its
> still going *bang* ?
>


I can do the formality of testing your proposed patch, but yes I think 
so. exclude_guest defaults to 1 because perf_guest defaults to false.

David
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