Date: Wed, 8 Mar 2006 13:22:21 -0800
From: Stephane Eranian <eranian@hpl.hp.com>
To: William Cohen <wcohen@redhat.com>
Cc: linux-kernel@vger.kernel.org, perfmon@napali.hpl.hp.com,
       perfctr-devel@lists.sourceforge.net, linux-ia64@vger.kernel.org
Subject: Re: 2.6.16-rc5 perfmon2 new code base + libpfm with Montecito support
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References: <20060308155311.GD13168@frankl.hpl.hp.com> <440F4130.5040703@redhat.com>
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Will,

On Wed, Mar 08, 2006 at 03:40:16PM -0500, William Cohen wrote:
> >
> >I have released another version of the perfmon new base package.
> >This release is relative to 2.6.16-rc5
> 
> Hello Stephane,
> 
> Is there any thoughts on how perfmon2 is going to work with xen enabled 
> kernels or processors that support virtualization?
> 

AFAIK, there is currently no Xen support for PMU on any platforms. By "support"
I mean suport for guests using the PMU. As such, I do not think this works.
I am planning on looking at this next because this is becoming a pressing matter
and not just on IA-64.

My first goal is to ensure that a guest using perfmon2 works once it is virtualized.
That implies that the Xen VMM does save/restore PMU state on guest switch. That's a bare
minimum.

As for HW virutlization support, I think it helps a little bit but there still needs to
be some additional code in the VMM to make this work correctly. This is also something
I want to look at.

-- 
-Stephane
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