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Date:	Tue, 8 Jul 2008 10:29:18 +1000
From:	Rusty Russell <>
Cc:	Jeremy Fitzhardinge <>,
	Nick Piggin <>,
	Jens Axboe <>,
	Xen devel <>,
	Peter Zijlstra <>,
	Christoph Lameter <>,
	Petr Tesarik <>,
	LKML <>,
	Thomas Friebel <>,
	Ingo Molnar <>
Subject: Re: [PATCH RFC 0/4] Paravirtual spinlocks

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",
> 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 :)

A little disappointing that you can't patch your version inline.

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