linux-kernel - Re: [PATCH 2/4, v2] x86: enlightenment for ticket spin locks

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Message-ID: <alpine.DEB.2.00.1006301647220.30135@kaball-desktop>
Date:	Wed, 30 Jun 2010 16:57:35 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Jan Beulich <JBeulich@...ell.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	ksrinivasan <ksrinivasan@...ell.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [PATCH 2/4, v2] x86: enlightenment for ticket spin locks - Xen
  implementation

On Wed, 30 Jun 2010, Jeremy Fitzhardinge wrote:
> On 06/29/2010 04:32 PM, Jan Beulich wrote:
> > Use the (alternative instructions based) callout hooks to the ticket
> > spinlock code to enlighten ticket locks when running fully virtualized
> > on Xen. Ultimately, this code might also be a candidate to be used
> > when running para-virtualized.
> >
> 
> I'm not sure what the gain is by making this independent of all the rest
> of the Xen support in the kernel.  Stefano is working on a series
> (posted a few times now) to add more paravirtual features for Xen HVM
> guests, and this work is conceptually very similar.

My series has been stable since a while now and contains all the basic
PV on HVM mechanisms you need, including parsing the cpuid and mapping
the shared info page.

Could you please rebase on my series (or at least the first two
patches), so that we don't conflict with each other?

Thanks,

Stefano
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