linux-kernel - Re: [PATCH v2 0/4] KVM: optimize the kvm_vcpu_on

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Date:   Tue, 8 Aug 2017 09:41:53 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     "Longpeng(Mike)" <longpeng2@...wei.com>
Cc:     <pbonzini@...hat.com>, <rkrcmar@...hat.com>, <agraf@...e.com>,
        <borntraeger@...ibm.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>,
        <david@...hat.com>
Subject: Re: [PATCH v2 0/4] KVM: optimize the kvm_vcpu_on_spin

On Tue, 8 Aug 2017 12:05:31 +0800
"Longpeng(Mike)" <longpeng2@...wei.com> wrote:

> This is a simple optimization for kvm_vcpu_on_spin, the
> main idea is described in patch-1's commit msg.

I think this generally looks good now.

> 
> I did some tests base on the RFC version, the result shows
> that it can improves the performance slightly.

Did you re-run tests on this version?

I would also like to see some s390 numbers; unfortunately I only have a
z/VM environment and any performance numbers would be nearly useless
there. Maybe somebody within IBM with a better setup can run a quick
test?