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

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Message-ID: <20140418131807.GD4010@phenom.dumpdata.com>
Date:	Fri, 18 Apr 2014 09:18:07 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Waiman Long <waiman.long@...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 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?


Thanks!
> 
> -Longman
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