linux-kernel - Re: [RFC] KVM: optimize the kvm_vcpu_on

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Message-ID: <0677ed6e-280a-d2f3-d873-1daf99b39551@redhat.com>
Date:   Mon, 31 Jul 2017 14:27:17 +0200
From:   David Hildenbrand <david@...hat.com>
To:     "Longpeng (Mike)" <longpeng2@...wei.com>
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com, agraf@...e.com,
        borntraeger@...ibm.com, cohuck@...hat.com,
        christoffer.dall@...aro.org, marc.zyngier@....com,
        james.hogan@...tec.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, weidong.huang@...wei.com,
        arei.gonglei@...wei.com, wangxinxin.wang@...wei.com,
        longpeng.mike@...il.com
Subject: Re: [RFC] KVM: optimize the kvm_vcpu_on_spin

> I'm not sure whether the operation of get the vcpu's priority-level is
> expensive on all architectures, so I record it in kvm_sched_out() for
> minimal the extra cycles cost in kvm_vcpu_on_spin().
> 

as you only care for x86 right now either way, you can directly optimize
here for the good (here: x86) case (keeping changes and therefore
possible bugs minimal).

-- 

Thanks,

David