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

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Message-ID: <535084FE.2030902@hp.com>
Date:	Thu, 17 Apr 2014 21:50:54 -0400
From:	Waiman Long <waiman.long@...com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	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>,
	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>
Subject: Re: [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support

On 04/17/2014 01:40 PM, Raghavendra K T wrote:
> On 04/17/2014 10:53 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?
>
> Saw changes in patch 18 that fixes for kvm (19 for xen). 'll
> test the series and confirm.
>

The main fix is by replacing some barrier() with smp_mb(). The 
additional changes in kvm and xen are not the main one.

-Longman

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