linux-kernel - Re: perf: record segfaults for cycles event when collecting data on a VM

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Message-ID: <4F33EA8D.4050009@gmail.com>
Date:	Thu, 09 Feb 2012 08:47:25 -0700
From:	David Ahern <dsahern@...il.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Jason Wang <jasowang@...hat.com>
Subject: Re: perf: record segfaults for cycles event when collecting data
 on a VM



On 02/09/2012 08:28 AM, Joerg Roedel wrote:
> On Thu, Feb 09, 2012 at 03:32:53PM +0100, Joerg Roedel wrote:
>> Yeah, right. Guest samples may also show up intentionally when the event
>> modifiers are used. So crashing on machine==NULL needs to be fixed.
> 
> Hmm, on the other hand, there is no way to specify guest symbol
> information to the regular perf subcommands except for perf-kvm. Without
> that information perf can not resolve any GUEST_KERNEL samples, so in
> the end there is no point in setting perf_guest to true except for
> perf-kvm, no?

Exactly. That was my point in my last reply.

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