linux-kernel - Re: [PATCH 6/5] KVM: x86: fix periodic lapic timer with hrtimers

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Date:   Tue, 25 Oct 2016 07:39:12 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm <kvm@...r.kernel.org>,
        Yunhong Jiang <yunhong.jiang@...el.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH 6/5] KVM: x86: fix periodic lapic timer with hrtimers

2016-10-24 23:27 GMT+08:00 Radim Krčmář <rkrcmar@...hat.com>:
> 2016-10-24 17:09+0200, Paolo Bonzini:
>> On 24/10/2016 17:03, Radim Krčmář wrote:
> [...]
>>
>> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
>>
>> Go ahead, squash it into 5/5 and commit to kvm/queue. :)
>
> Did that, thanks.
>
> Wanpeng, the code is now under your name so please check it and/or
> complain.

This patch 6/5 incurred regressions.

- The latency of the periodic mode which is emulated by VMX preemption
is almost the same as periodic mode which is emulated by hrtimer.
- The oneshot mode test of kvm-unit-tests/apic_timer_latency.flat almost fail.

Btw, hope you can also apply the testcase for kvm-unit-tests. :)

Regards,
Wanpeng Li