From: "Longpeng (Mike)" <longpeng2@huawei.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>,
"Wubin (H)" <wu.wubin@huawei.com>,
zhaoshenglong <zhaoshenglong@huawei.com>,
kvm <kvm@vger.kernel.org>
Subject: Re: A problem about optimize the kvm_vcpu_on_spin
Date: Mon, 14 Nov 2016 17:30:39 +0800 [thread overview]
Message-ID: <5829843F.3020007@huawei.com> (raw)
In-Reply-To: <822509139.12568024.1479113775757.JavaMail.zimbra@redhat.com>
On 2016/11/14 16:56, Paolo Bonzini wrote:
>
>> Intel sdm vol3 ch-25.1.3 (p-1074) said: The “PAUSE-loop exiting” VM-execution
>> control is ignored if CPL > 0.
>>
>> Does this means that only guest's kernelspace spinlock could causes VMexit
>> due to "pause-loop exiting" ?
>>
>> If so, I think the kvm_vcpu_on_spin should selects a (currently not
>> running) vcpu which cpl=0 to boost, because the cpl>0 vcpus are not
>> the lock-holder. (suppose the guest isn't RT-linux)
>>
>> What about your opinion ?
>
> Yes, that's a good idea!
>
> Paolo
Thanks, I will send a RFC this week.
>
> .
>
--
Regards,
Longpeng(Mike)
prev parent reply other threads:[~2016-11-14 9:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 1:44 A problem about optimize the kvm_vcpu_on_spin Longpeng (Mike)
2016-11-14 8:56 ` Paolo Bonzini
2016-11-14 9:30 ` Longpeng (Mike) [this message]
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