linux-kernel - Re: [PATCH 1/3] perf, core: Introduce attrs to count in either host or guest mode

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Message-ID: <20110511140242.GB18219@elte.hu>
Date:	Wed, 11 May 2011 16:02:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Joerg Roedel <joerg.roedel@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/3] perf, core: Introduce attrs to count in either host
 or guest mode


* Avi Kivity <avi@...hat.com> wrote:

> On 05/11/2011 04:49 PM, Peter Zijlstra wrote:
> >On Wed, 2011-05-11 at 14:45 +0300, Avi Kivity wrote:
> >>  Well, actually, that depends on the meaning of exclude_hv.
> >
> >exclude_hv is for when the host is a guest and we don't wish to sample
> >the host's host etc. PPC introduced this because ppc-linux runs as a
> >guest of the 'firmware' and not on the native hardware.
> 
> Okay.  A comment is needed there to explain the differences then.

Yeah.

Also, the flags are named in a way to make the default zero value the most 
inclusive option. So we do not have include_guest but exclude_guest, etc.

Thanks,

	Ingo
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