Re: [PATCH RFC V5 0/3] kvm: Improving directed yield in PLE handler

[Avi Kivity]

On 07/18/2012 04:37 PM, Raghavendra K T wrote:
> Currently Pause Loop Exit (PLE) handler is doing directed yield to a
> random vcpu on pl-exit. We already have filtering while choosing
> the candidate to yield_to. This change adds more checks while choosing
> a candidate to yield_to.
> 
> On a large vcpu guests, there is a high probability of
> yielding to the same vcpu who had recently done a pause-loop exit. 
> Such a yield can lead to the vcpu spinning again.
> 
> The patchset keeps track of the pause loop exit and gives chance to a
> vcpu which has:
> 
>  (a) Not done pause loop exit at all (probably he is preempted lock-holder)
> 
>  (b) vcpu skipped in last iteration because it did pause loop exit, and
>  probably has become eligible now (next eligible lock holder)
> 
> This concept also helps in cpu relax interception cases which use same handler.
> 

Thanks, applied to 'queue'.


-- 
error compiling committee.c: too many arguments to function


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