linux-kernel - Re: [PATCH 3/3] KVM: LAPIC: Fix lapic timer injection delay

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Message-ID: <c0cda5bf-eed1-9898-925d-ad99407cba09@redhat.com>
Date:   Mon, 3 Jul 2017 10:16:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm <kvm@...r.kernel.org>, Radim Krcmar <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH 3/3] KVM: LAPIC: Fix lapic timer injection delay



On 03/07/2017 10:08, Wanpeng Li wrote:
>> Yeah, I'm not entirely satisfied with it but it's working: start_sw
>> timer will see ktimer->pending and do nothing.
>>
>> But thinking more about it, maybe the "if (r)" can be omitted
>> completely?  We need to benchmark it but it can be done.
> "if (r)" makes codes more understandable, in addition, calling expired
> the pending timer here looks weird though ktimer->pending.

We can remove the call to apic_timer_expired too (sorry if I was too
terse). :)  start_sw_period and start_sw_tscdeadline would take care of it.

Paolo