Messages in this thread | | | Date | Wed, 06 Jul 2016 18:18:27 +0800 | From | xinhui <> | Subject | Re: [PATCH v2 2/4] powerpc/spinlock: support vcpu preempted check |
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On 2016年07月06日 16:32, Wanpeng Li wrote: > 2016-07-06 15:58 GMT+08:00 Peter Zijlstra <peterz@infradead.org>: >> On Wed, Jul 06, 2016 at 02:46:34PM +0800, Wanpeng Li wrote: >>>> SO it's easy for ppc to implement such interface. Note that yield_count is >>>> set by powerVM/KVM. >>>> and only pSeries can run a guest for now. :) >>>> >>>> I also review x86 related code, looks like we need add one hyer-call to get >>>> such vcpu preemption info? >>> >>> There is no such stuff to record lock holder in x86 kvm, maybe we >>> don't need to depend on PLE handler algorithm to guess it if we can >>> know lock holder vCPU directly. >> >> x86/kvm has vcpu->preempted to indicate if a vcpu is currently preempted >> or not. I'm just not sure if that is visible to the guest or how to make >> it so. > > Yeah, I miss it. I can be the volunteer to do it if there is any idea, > ping Paolo. :) > glad to know that. :)
> Regards, > Wanpeng Li >
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