linux-kernel - Re: [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support

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Message-ID: <53515B56.3070406@hp.com>
Date:	Fri, 18 Apr 2014 13:05:26 -0400
From:	Waiman Long <waiman.long@...com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	Paolo Bonzini <paolo.bonzini@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>,
	Marcos Matsunaga <Marcos.Matsunaga@...cle.com>
Subject: Re: [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support

On 04/18/2014 09:18 AM, Konrad Rzeszutek Wilk wrote:
> On Thu, Apr 17, 2014 at 09:48:36PM -0400, Waiman Long wrote:
>> On 04/17/2014 01:23 PM, Konrad Rzeszutek Wilk wrote:
>>> On Thu, Apr 17, 2014 at 11:03:52AM -0400, Waiman Long wrote:
>>>> v8->v9:
>>>>    - Integrate PeterZ's version of the queue spinlock patch with some
>>>>      modification:
>>>>      http://lkml.kernel.org/r/20140310154236.038181843@infradead.org
>>>>    - Break the more complex patches into smaller ones to ease review effort.
>>>>    - Fix a racing condition in the PV qspinlock code.
>>> I am not seeing anything mentioning that the overcommit scenario
>>> for KVM and Xen had been fixed. Or was the 'racing condition' said
>>> issue?
>>>
>>> Thanks.
>> The hanging is caused by a racing condition which should be fixed in
>> the v9 patch. Please let me know if you are still seeing it.
> OK, is there a git tree with these patches to easily slurp them up?
>

I am sorry that I don't have a public git tree with the qspinlock 
patches. However, I have made a consolidated patch (patches 1-19) in the 
attached file. Hopefully that will make it easier to apply the patch. 
BTW, it has to be on top of 3.15-rc1 or later version. This may also be 
a conflict in the xen/spinlock.c file.

-Longman

View attachment "qspinlock-consolidated-patches" of type "text/plain" (67161 bytes)