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

[Waiman Long]

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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