[Xen-devel] Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to s

To:	Rik van Riel <riel@xxxxxxxxxx>
Subject:	[Xen-devel] Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
From:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date:	Mon, 24 Jan 2011 09:49:58 -0800
Cc:	Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, vatsa@xxxxxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, suzuki@xxxxxxxxxx, Avi Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Américo Wang <xiyou.wangcong@xxxxxxxxx>, Eric Dumazet <dada1@xxxxxxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>
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On 01/22/2011 06:53 AM, Rik van Riel wrote:
> The main question that remains is whether the PV ticketlocks are
> a large enough improvement to also merge those.  I expect they
> will be, and we'll see so in the benchmark numbers.

The pathological worst-case of ticket locks in a virtual environment
isn't very hard to hit, so I expect they'll make a huge difference
there.   On lightly loaded systems (little or no CPU overcommit) then
they should be close to a no-op.

    J

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