From: Rik van Riel <riel@redhat.com>
To: Jiannan Ouyang <ouyang@cs.pitt.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Avi Kivity <avi.kivity@gmail.com>, Gleb Natapov <gleb@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Srikar <srikar@linux.vnet.ibm.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>,
KVM <kvm@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
Chegu Vinod <chegu_vinod@hp.com>,
"Andrew M. Theurer" <habanero@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <srivatsa.vaddagiri@gmail.com>,
Andrew Jones <drjones@redhat.com>, Karen Noel <knoel@redhat.com>
Subject: Re: Preemptable Ticket Spinlock
Date: Mon, 22 Apr 2013 16:49:59 -0400 [thread overview]
Message-ID: <5175A277.5080208@redhat.com> (raw)
In-Reply-To: <CAJocwceW6BuEu0Yuyv472aarpcziZH1wd-Xbc+Om81ES8+w+SA@mail.gmail.com>
On 04/22/2013 04:46 PM, Jiannan Ouyang wrote:
> It would still be very interesting to conduct more experiments to
> compare these two, to see if the fairness enforced by pv_lock is
> mandatory, and if preemptable-lock outperforms pv_lock in most cases,
> and how do they work with PLE.
Given the fairly high cost of rescheduling a VCPU (which is likely
to include an IPI), versus the short hold time of most spinlocks,
I have the strong suspicion that your approach would win.
The fairness is only compromised in a limited way and in certain
circumstances, so I am not too worried about that.
--
All rights reversed
next prev parent reply other threads:[~2013-04-22 20:49 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAJocwccu5QQyuKRvgNyPSFz2K_rzCW419W9-XdSUYOL7+KqQKg@mail.gmail.com>
2013-04-21 21:12 ` Preemptable Ticket Spinlock Rik van Riel
2013-04-21 23:07 ` Jiannan Ouyang
2013-04-22 5:59 ` Raghavendra K T
2013-04-22 11:51 ` Peter Zijlstra
2013-04-22 12:52 ` Rik van Riel
2013-04-22 19:49 ` Peter Zijlstra
2013-04-22 19:56 ` Rik van Riel
2013-04-22 20:05 ` Jiannan Ouyang
2013-04-22 20:08 ` Peter Zijlstra
2013-04-22 20:32 ` Rik van Riel
2013-04-22 20:44 ` Peter Zijlstra
2013-04-22 20:48 ` Peter Zijlstra
2013-04-22 20:50 ` Rik van Riel
2013-04-22 20:50 ` Jiannan Ouyang
2013-04-22 20:54 ` Chegu Vinod
2013-04-22 20:46 ` Jiannan Ouyang
2013-04-22 20:49 ` Rik van Riel [this message]
2013-04-22 21:01 ` Peter Zijlstra
2013-04-23 5:03 ` Raghavendra K T
2013-04-22 20:55 ` Peter Zijlstra
2013-04-22 21:31 ` Jiannan Ouyang
2013-04-22 23:08 ` Rik van Riel
2013-04-23 5:57 ` Gleb Natapov
2013-04-23 1:42 ` Raghavendra K T
2013-05-30 11:56 ` Raghavendra K T
2013-05-30 20:14 ` Thomas Gleixner
2013-04-22 21:56 ` Andi Kleen
2013-04-22 23:13 ` Rik van Riel
2013-04-22 5:58 ` Raghavendra K T
2013-04-22 16:42 ` Jiannan Ouyang
2013-04-23 1:54 ` Raghavendra K T
2013-04-26 20:10 ` Andrew Theurer
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