From mboxrd@z Thu Jan  1 00:00:00 1970
From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Subject: Re: [PATCH 00/14] PV ticket locks without expanding spinlock
Date: Wed, 19 Jan 2011 22:14:33 +0530
Message-ID: <20110119164432.GA30669@linux.vnet.ibm.com>
References: <cover.1289940821.git.jeremy.fitzhardinge@citrix.com>
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Cc: Peter Zijlstra <peterz@infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Nick Piggin <npiggin@kernel.dk>,
	Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
	=?iso-8859-1?Q?Am=E9rico?= Wang <xiyou.wangcong@gmail.com>,
	Eric Dumazet <dada1@cosmosbay.com>,
	Jan Beulich <JBeulich@novell.com>, Avi Kivity <avi@redhat.com>,
	Xen-devel <xen-devel@lists.xensource.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Linux Virtualization <virtualization@lists.linux-foundation.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
	kvm@vger.kernel.org, suzuki@in.ibm.com
To: Jeremy Fitzhardinge <jeremy@goop.org>
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On Tue, Nov 16, 2010 at 01:08:31PM -0800, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
> 
> Hi all,
> 
> This is a revised version of the pvticket lock series.

The 3-patch series to follow this email extends KVM-hypervisor and Linux guest 
running on KVM-hypervisor to support pv-ticket spinlocks.

Two hypercalls are being introduced in KVM hypervisor, one that allows a
vcpu (spinning on a lock) to block and another that allows a vcpu to kick
another out of blocking state.

Patches are against 2.6.37 mainline kernel. I also don't yet have numbers 
at this time to show benefit of pv-ticketlocks - I would think the benefit
should be similar across hypervisors (Xen and KVM in this case).

- vatsa