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Date:	Sun, 23 Dec 2012 16:17:45 -0700
From:	David Ahern <>
To:	Gleb Natapov <>
CC:	Linus Torvalds <>,
	Ingo Molnar <>,
	Linux Kernel Mailing List <>,
	Arnaldo Carvalho de Melo <>,
	Peter Zijlstra <>,
	Thomas Gleixner <>,
	Andrew Morton <>
Subject: Re: [GIT PULL] perf changes for v3.8

On 12/23/12 2:23 AM, Gleb Natapov wrote:
>> Your patch alone was not enough. Start here:
> I cannot reproduce this failure. I reverted 20b279ddb38c and ran "perf
> record -e cycles:ppG" while guest was running. Admittedly I ran the test
> for a short time, but without disabling PEBS during the guest entry this
> was enough to crash a guest.

In the beginning (without any patches) VMs crashed fairly quickly. With 
your patch it took longer, but I was able to consistently crash VMs. The 
thread notes server info (processor, OS) and VM versions as well as load 
used for the tests -- a cpu bound process (openssl), disk bound (dd) and 
network (netperf).

> What about forcing exclude_guest on an event that
> has precise flag set without reporting error to userspace?

That's up to the perf maintainers -- Ingo, Peter, Arnaldo. Personally, I 
don't like it since kernel side is changing the user request.

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