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Re: [Xen-devel] [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support
- To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
- From: Waiman Long <waiman.long@xxxxxx>
- Date: Thu, 17 Apr 2014 21:48:36 -0400
- Cc: linux-arch@xxxxxxxxxxxxxxx, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Scott J Norton <scott.norton@xxxxxx>, x86@xxxxxxxxxx, Paolo Bonzini <paolo.bonzini@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Chegu Vinod <chegu_vinod@xxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>
- Delivery-date: Fri, 18 Apr 2014 01:48:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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@xxxxxxxxxxxxx
- 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.
-Longman
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