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

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Message-ID: <20120209152844.GQ22598@amd.com>
Date:	Thu, 9 Feb 2012 16:28:44 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Ahern <dsahern@...il.com>,
	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 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?

	Joerg

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