linux-kernel - Re: [RFC][PATCH 0/3] perf support for amd guest/host-only bits

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Message-ID: <20110511085744.GA8707@8bytes.org>
Date:	Wed, 11 May 2011 10:57:44 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Roedel, Joerg" <Joerg.Roedel@....com>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/3] perf support for amd guest/host-only bits

On Tue, May 10, 2011 at 10:41:49PM +0200, Ingo Molnar wrote:

> 'perf kvm' is the tool that is making Linux instrumentation friendlier to KVM 
> developers. Can you think of ways to utilize this new feature there?
> 
> For example a new 'perf kvm stat' feature could pass the exclusion bits to perf 
> stat automatically. 'perf kvm record' could record on the guest only by 
> default.

Yes, that would make sense. 'perf kvm' can default to guest-only
profiling. Hmm, but that would change existing behavior. It is probably
better to bind it to the --guest and --host parameters of perf-kvm.
Okay, this changes existing behavior too, so the default-thing seems the
better choice :)

	Joerg

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