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SubjectRe: [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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