From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Jeremy Fitzhardinge" <jeremy@goop.org>,
Xen-devel <xen-devel@lists.xensource.com>,
"Mathieu Desnoyers" <mathieu.desnoyers@polymtl.ca>,
"Nick Piggin" <npiggin@kernel.dk>,
kvm@vger.kernel.org,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Jan Beulich" <JBeulich@novell.com>,
"Eric Dumazet" <dada1@cosmosbay.com>,
"Jeremy Fitzhardinge" <jeremy.fitzhardinge@citrix.com>,
suzuki@in.ibm.com, "Avi Kivity" <avi@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Américo Wang" <xiyou.wangcong@gmail.com>,
"Linux Virtualization"
<virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
Date: Wed, 19 Jan 2011 23:59:41 +0530 [thread overview]
Message-ID: <20110119182940.GA7235@linux.vnet.ibm.com> (raw)
In-Reply-To: <1295457672.28776.144.camel@laptop>
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
next prev parent reply other threads:[~2011-01-19 18:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1289940821.git.jeremy.fitzhardinge@citrix.com>
2011-01-19 16:44 ` [PATCH 00/14] PV ticket locks without expanding spinlock Srivatsa Vaddagiri
2011-01-19 17:07 ` [PATCH 1/3] debugfs: Add support to print u32 array Srivatsa Vaddagiri
2011-01-19 17:12 ` [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock Srivatsa Vaddagiri
2011-01-19 17:21 ` Peter Zijlstra
2011-01-19 18:29 ` Srivatsa Vaddagiri [this message]
2011-01-19 18:53 ` Jeremy Fitzhardinge
2011-01-20 11:42 ` Srivatsa Vaddagiri
2011-01-20 17:49 ` Jeremy Fitzhardinge
2011-01-20 11:59 ` Srivatsa Vaddagiri
2011-01-20 13:41 ` Peter Zijlstra
2011-01-20 14:34 ` Srivatsa Vaddagiri
2011-01-20 17:56 ` Jeremy Fitzhardinge
2011-01-21 14:02 ` Srivatsa Vaddagiri
2011-01-21 14:48 ` Rik van Riel
2011-01-22 6:14 ` Srivatsa Vaddagiri
2011-01-22 14:53 ` Rik van Riel
2011-01-24 17:49 ` Jeremy Fitzhardinge
2011-01-19 17:23 ` Srivatsa Vaddagiri
2011-01-19 17:50 ` Peter Zijlstra
2011-01-19 17:17 ` [PATCH 3/3] kvm guest : Add support for pv-ticketlocks Srivatsa Vaddagiri
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