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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH RFC 0/4] Paravirtual spinlocks
Date: Tue, 8 Jul 2008 14:51:42 +1000
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Cc: virtualization@lists.linux-foundation.org,
       Jeremy Fitzhardinge <jeremy@goop.org>, Jens Axboe <axboe@kernel.dk>,
       Xen devel <xen-devel@lists.xensource.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Christoph Lameter <clameter@linux-foundation.org>,
       Petr Tesarik <ptesarik@suse.cz>, LKML <linux-kernel@vger.kernel.org>,
       Thomas Friebel <thomas.friebel@amd.com>, Ingo Molnar <mingo@elte.hu>
References: <20080707190749.299430659@goop.org> <200807081029.19242.rusty@rustcorp.com.au>
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On Tuesday 08 July 2008 10:29, Rusty Russell wrote:
> On Tuesday 08 July 2008 05:07:49 Jeremy Fitzhardinge wrote:
> > At the most recent Xen Summit, Thomas Friebel presented a paper
> > ("Preventing Guests from Spinning Around",
> > http://xen.org/files/xensummitboston08/LHP.pdf) investigating the
> > interactions between spinlocks and virtual machines.  Specifically, he
> > looked at what happens when a lock-holding VCPU gets involuntarily
> > preempted.
>
> I find it interesting that gang scheduling the guest was not suggested as
> an obvious solution.
>
> Anyway, concept looks fine; lguest's solution is more elegant of course :)

What's lguest's solution?