From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Jeremy Fitzhardinge" <jeremy@goop.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Nick Piggin" <npiggin@kernel.dk>,
"Mathieu Desnoyers" <mathieu.desnoyers@polymtl.ca>,
"Américo 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
Subject: Re: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
Date: Thu, 20 Jan 2011 20:04:30 +0530 [thread overview]
Message-ID: <20110120143430.GA17815@linux.vnet.ibm.com> (raw)
In-Reply-To: <1295530906.28776.171.camel@laptop>
On Thu, Jan 20, 2011 at 02:41:46PM +0100, Peter Zijlstra wrote:
> On Thu, 2011-01-20 at 17:29 +0530, Srivatsa Vaddagiri wrote:
> >
> > If we had a yield-to [1] sort of interface _and_ information on which vcpu
> > owns a lock, then lock-spinners can yield-to the owning vcpu,
>
> and then I'd nak it for being stupid ;-)
>
> really, yield*() is retarded, never even consider using it. If you've
> got the actual owner you can do full blown PI, which is tons better than
> a 'do-something-random' call.
Yes definitely that would be much better than yield-to.
> The only reason the whole non-virt pause loop filtering muck uses it is
> because it really doesn't know anything, and do-something is pretty much
> all it can do. Its a broken interface.
- vatsa
next prev parent reply other threads:[~2011-01-20 14:34 UTC|newest]
Thread overview: 147+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-16 21:08 [PATCH 00/14] PV ticket locks without expanding spinlock Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 01/14] x86/ticketlock: clean up types and accessors Jeremy Fitzhardinge
2011-01-11 17:21 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-01-11 17:21 ` Konrad Rzeszutek Wilk
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 02/14] x86/ticketlock: convert spin loop to C Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 03/14] x86/ticketlock: Use C for __ticket_spin_unlock Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 04/14] x86/ticketlock: make large and small ticket versions of spin_lock the same Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 05/14] x86/ticketlock: make __ticket_spin_lock common Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 06/14] x86/ticketlock: make __ticket_spin_trylock common Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 07/14] x86/spinlocks: replace pv spinlocks with pv ticketlocks Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 08/14] x86/ticketlock: collapse a layer of functions Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 09/14] xen/pvticketlock: Xen implementation for PV ticket locks Jeremy Fitzhardinge
2010-11-17 8:11 ` Jan Beulich
2010-11-17 8:11 ` Jan Beulich
2010-11-17 8:11 ` Jan Beulich
2010-11-17 8:52 ` Jeremy Fitzhardinge
2010-11-17 8:52 ` Jeremy Fitzhardinge
2010-11-17 9:57 ` [Xen-devel] " Jeremy Fitzhardinge
2010-11-17 10:34 ` Jan Beulich
2010-11-17 10:34 ` Jan Beulich
2010-11-17 10:34 ` Jan Beulich
2010-11-17 17:41 ` [Xen-devel] " Jeremy Fitzhardinge
2010-11-17 17:41 ` Jeremy Fitzhardinge
2010-11-17 17:41 ` Jeremy Fitzhardinge
2010-11-17 9:57 ` [Xen-devel] " Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 10/14] x86/pvticketlock: use callee-save for lock_spinning Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 11/14] x86/ticketlock: don't inline _spin_unlock when using paravirt spinlocks Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 12/14] x86/ticketlocks: when paravirtualizing ticket locks, increment by 2 Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-16 21:08 ` [PATCH 13/14] x86/ticketlock: add slowpath logic Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-17 8:31 ` Jan Beulich
2010-11-17 8:31 ` Jan Beulich
2010-11-17 8:52 ` Jeremy Fitzhardinge
2010-11-17 8:52 ` Jeremy Fitzhardinge
2010-11-17 8:56 ` Jeremy Fitzhardinge
2010-11-17 8:56 ` Jeremy Fitzhardinge
2010-11-17 9:08 ` Jeremy Fitzhardinge
2010-11-17 9:08 ` Jeremy Fitzhardinge
2010-11-17 9:08 ` Jeremy Fitzhardinge
2010-11-17 9:34 ` Jan Beulich
2010-11-17 9:34 ` Jan Beulich
2010-11-17 9:34 ` Jan Beulich
2010-11-17 8:56 ` Jeremy Fitzhardinge
2010-11-17 8:58 ` Avi Kivity
2010-11-17 8:58 ` Avi Kivity
2010-11-17 9:05 ` Jeremy Fitzhardinge
2010-11-17 9:05 ` Jeremy Fitzhardinge
2010-11-17 9:10 ` Avi Kivity
2010-11-17 9:10 ` Avi Kivity
2010-11-17 9:10 ` Avi Kivity
2010-11-17 9:05 ` Jeremy Fitzhardinge
2010-11-17 8:52 ` Jeremy Fitzhardinge
2010-11-17 8:31 ` Jan Beulich
2010-11-17 12:21 ` Peter Zijlstra
2010-11-17 12:21 ` Peter Zijlstra
2010-11-17 15:25 ` [Xen-devel] " Jeremy Fitzhardinge
2010-11-17 15:25 ` Jeremy Fitzhardinge
2010-11-17 15:25 ` [Xen-devel] " Jeremy Fitzhardinge
2011-01-17 15:22 ` Srivatsa Vaddagiri
2011-01-19 16:23 ` Srivatsa Vaddagiri
2011-01-19 16:23 ` Srivatsa Vaddagiri
2011-01-24 21:56 ` Jeremy Fitzhardinge
2011-01-24 21:56 ` Jeremy Fitzhardinge
2011-02-18 17:03 ` Srivatsa Vaddagiri
2011-02-18 17:03 ` Srivatsa Vaddagiri
2011-02-18 17:03 ` Srivatsa Vaddagiri
2011-01-19 16:23 ` Srivatsa Vaddagiri
2011-01-19 18:31 ` Jeremy Fitzhardinge
2011-01-19 18:31 ` Jeremy Fitzhardinge
2011-01-19 18:31 ` Jeremy Fitzhardinge
2011-01-19 18:39 ` Srivatsa Vaddagiri
2011-01-19 18:39 ` Srivatsa Vaddagiri
2011-01-19 18:55 ` Jeremy Fitzhardinge
2011-01-20 4:28 ` Srivatsa Vaddagiri
2011-01-20 4:28 ` Srivatsa Vaddagiri
2011-01-20 9:52 ` Jan Beulich
2011-01-20 9:52 ` Jan Beulich
2011-01-20 9:52 ` Jan Beulich
2011-01-19 18:55 ` Jeremy Fitzhardinge
2011-01-17 15:22 ` Srivatsa Vaddagiri
2010-11-16 21:08 ` [PATCH 14/14] x86/ticketlocks: tidy up __ticket_unlock_kick() Jeremy Fitzhardinge
2010-11-16 21:08 ` Jeremy Fitzhardinge
2010-11-17 8:56 ` [PATCH 00/14] PV ticket locks without expanding spinlock Avi Kivity
2010-11-17 8:56 ` Avi Kivity
2011-01-19 16:44 ` Srivatsa Vaddagiri
2011-01-19 16:44 ` Srivatsa Vaddagiri
2011-01-19 17:07 ` [PATCH 1/3] debugfs: Add support to print u32 array Srivatsa Vaddagiri
2011-01-19 17:07 ` Srivatsa Vaddagiri
2011-01-19 17:07 ` Srivatsa Vaddagiri
2011-01-19 17:12 ` [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock Srivatsa Vaddagiri
2011-01-19 17:12 ` Srivatsa Vaddagiri
2011-01-19 17:21 ` Peter Zijlstra
2011-01-19 17:21 ` Peter Zijlstra
2011-01-19 17:21 ` Peter Zijlstra
2011-01-19 18:29 ` Srivatsa Vaddagiri
2011-01-19 18:29 ` Srivatsa Vaddagiri
2011-01-19 18:29 ` Srivatsa Vaddagiri
2011-01-19 18:53 ` Jeremy Fitzhardinge
2011-01-19 18:53 ` Jeremy Fitzhardinge
2011-01-20 11:42 ` Srivatsa Vaddagiri
2011-01-20 11:42 ` Srivatsa Vaddagiri
2011-01-20 17:49 ` Jeremy Fitzhardinge
2011-01-20 17:49 ` Jeremy Fitzhardinge
2011-01-20 17:49 ` Jeremy Fitzhardinge
2011-01-20 11:59 ` Srivatsa Vaddagiri
2011-01-20 13:41 ` Peter Zijlstra
2011-01-20 13:41 ` Peter Zijlstra
2011-01-20 13:41 ` Peter Zijlstra
2011-01-20 14:34 ` Srivatsa Vaddagiri
2011-01-20 14:34 ` Srivatsa Vaddagiri [this message]
2011-01-20 17:56 ` Jeremy Fitzhardinge
2011-01-20 17:56 ` Jeremy Fitzhardinge
2011-01-21 14:02 ` Srivatsa Vaddagiri
2011-01-21 14:48 ` Rik van Riel
2011-01-21 14:48 ` Rik van Riel
2011-01-22 6:14 ` Srivatsa Vaddagiri
2011-01-22 6:14 ` Srivatsa Vaddagiri
2011-01-22 14:53 ` Rik van Riel
2011-01-22 14:53 ` Rik van Riel
2011-01-24 17:49 ` Jeremy Fitzhardinge
2011-01-24 17:49 ` Jeremy Fitzhardinge
2011-01-22 6:14 ` Srivatsa Vaddagiri
2011-01-21 14:48 ` Rik van Riel
2011-01-21 14:02 ` Srivatsa Vaddagiri
2011-01-20 11:59 ` Srivatsa Vaddagiri
2011-01-19 17:23 ` Srivatsa Vaddagiri
2011-01-19 17:23 ` Srivatsa Vaddagiri
2011-01-19 17:50 ` Peter Zijlstra
2011-01-19 17:50 ` Peter Zijlstra
2011-01-19 17:50 ` Peter Zijlstra
2011-01-19 17:17 ` [PATCH 3/3] kvm guest : Add support for pv-ticketlocks Srivatsa Vaddagiri
2011-01-19 17:17 ` Srivatsa Vaddagiri
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