Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set

[Pankaj Gupta]

> Subject: Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
> 
> On Thu, Nov 09, 2017 at 05:05:36PM +0100, Radim Krcmar wrote:
> > 2017-11-09 10:53-0500, Pankaj Gupta:
> > > 2] PV TLB should also behave as per option PV_DEDICATED for better
> > > performance.
> > 
> > Right,
> 
> Shouldn't KVM do flush_tlb_other() in any case? Not sure how
> PV_DEDICATED can help with that.

Yes.

If I understand it correctly, It will just avoid traversing all the 
cpus another time just to check/set 'KVM_VCPU_PREEMPTED'/FLUSH value and 
clear the cpu mask.

Thanks,
Pankaj