linux-kernel - Re: [GIT PULL] perf changes for v3.8

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Message-ID: <50C9E861.2010304@gmail.com>
Date:	Thu, 13 Dec 2012 07:38:25 -0700
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf changes for v3.8

On 12/13/12 7:30 AM, David Ahern wrote:
>> It's not annoying, it's outright broken - it's a regression that
>> we'll fix.
>
> One of the problems is that existing binaries set the exclude_guest flag
> (https://lkml.org/lkml/2012/7/9/292).

Correction, I meant to say one of the problems is that existing binaries 
sets the flag to 0 when precise is used.

>
> So, requesting users to update their binaries if they want to use
> precise sampling is not acceptable. A 100% catastrophic failure of all
> running VMs is acceptable? All VMs will crash and there is no direct
> causal relationship.


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