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xen-devel
[Xen-devel] Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to support p
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To: |
Peter Zijlstra <peterz@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock |
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From: |
Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx> |
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Date: |
Wed, 19 Jan 2011 23:59:41 +0530 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Eric Dumazet <dada1@xxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, suzuki@xxxxxxxxxx, Avi Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Américo Wang <xiyou.wangcong@xxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx> |
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Wed, 19 Jan 2011 10:30:24 -0800 |
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<cover.1289940821.git.jeremy.fitzhardinge@xxxxxxxxxx> <20110119164432.GA30669@xxxxxxxxxxxxxxxxxx> <20110119171239.GB726@xxxxxxxxxxxxxxxxxx> <1295457672.28776.144.camel@laptop> |
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Mutt/1.5.20 (2009-06-14) |
On Wed, Jan 19, 2011 at 06:21:12PM +0100, Peter Zijlstra wrote:
> I didn't really read the patch, and I totally forgot everything from
> when I looked at the Xen series, but does the Xen/KVM hypercall
> interface for this include the vcpu to await the kick from?
No not yet, for reasons you mention below.
> My guess is not, since the ticket locks used don't know who the owner
> is, which is of course, sad. There are FIFO spinlock implementations
> that can do this though.. although I think they all have a bigger memory
> footprint.
>
> The reason for wanting this should be clear I guess, it allows PI.
Yeah - that would be good to experiment with.
- vatsa
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