linux-kernel - Re: Preemptable Ticket Spinlock

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Message-id: <CAJocwce9e=fcnJomctC82H9t5EUMaTStzLSgqoaUoAzbYm3p+A@mail.gmail.com>
Date:	Mon, 22 Apr 2013 17:31:14 -0400
From:	Jiannan Ouyang <ouyang@...pitt.edu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Avi Kivity <avi.kivity@...il.com>,
	Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Chegu Vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Andrew Jones <drjones@...hat.com>,
	Karen Noel <knoel@...hat.com>
Subject: Re: Preemptable Ticket Spinlock

On Mon, Apr 22, 2013 at 4:55 PM, Peter Zijlstra <peterz@...radead.org> wrote:

>
> Which pv_lock? The current pv spinlock mess is basically the old unfair
> thing. The later patch series I referred to earlier implemented a
> paravirt ticket lock, that should perform much better under overcommit.
>

Yes, it is a paravirt *ticket* spinck. I got the patch from
Raghavendra K T through email
http://lwn.net/Articles/495597/
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