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Re: [Xen-devel] [PATCH v9 00/19] qspinlock: a 4-byte queue spinlock with PV support
- To: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
- From: Waiman Long <waiman.long@xxxxxx>
- Date: Thu, 17 Apr 2014 21:50:54 -0400
- Cc: linux-arch@xxxxxxxxxxxxxxx, 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 01:51:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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@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?
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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