Re: [Xen-devel] [PATCH 0/9] qspinlock stuff -v15

[Waiman Long <waiman.long@xxxxxx>]

On 03/30/2015 12:29 PM, Peter Zijlstra wrote:
> On Mon, Mar 30, 2015 at 12:25:12PM -0400, Waiman Long wrote:
> > I did it differently in my PV portion of the qspinlock patch. Instead of
> > just waking up the CPU, the new lock holder will check if the new queue head
> > has been halted. If so, it will set the slowpath flag for the halted queue
> > head in the lock so as to wake it up at unlock time. This should eliminate
> > your concern of dong twice as many VMEXIT in an overcommitted scenario.
> We can still do that on top of all this right? As you might have
> realized I'm a fan of gradual complexity :-)
Of course. I am just saying that the concern can be addressed with some 
additional code change.
-Longman

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