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From: Wanpeng Li <kernellwp@gmail.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH v2 2/3] KVM: X86: Implement PV sched yield hypercall
Date: Tue, 28 May 2019 17:57:46 +0800	[thread overview]
Message-ID: <CANRm+Cx+Uhy+C4KUCkyhxQ9UPOak4Kwo0JNyxEtZ4vHQHRWmPQ@mail.gmail.com> (raw)
In-Reply-To: <9f3ff1f4-8173-3037-0a3f-a6036076bca5@de.ibm.com>

On Tue, 28 May 2019 at 17:12, Christian Borntraeger
<borntraeger@de.ibm.com> wrote:
>
> On 28.05.19 02:53, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@tencent.com>
> >
> > The target vCPUs are in runnable state after vcpu_kick and suitable
> > as a yield target. This patch implements the sched yield hypercall.
> >
> > 17% performace increase of ebizzy benchmark can be observed in an
> > over-subscribe environment. (w/ kvm-pv-tlb disabled, testing TLB flush
> > call-function IPI-many since call-function is not easy to be trigged
> > by userspace workload).
> >
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Radim Krčmář <rkrcmar@redhat.com>
> > Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
>
> FWIW, we do have a similar interface in s390.
>
> See arch/s390/kvm/diag.c  __diag_time_slice_end_directed for our implementation.

Good to know this. :)

Regards,
Wanpeng Li

  reply	other threads:[~2019-05-28  9:57 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28  0:53 [PATCH v2 0/3] KVM: Yield to IPI target if necessary Wanpeng Li
2019-05-28  0:53 ` [PATCH v2 1/3] KVM: X86: Implement PV sched yield in linux guest Wanpeng Li
2019-05-28  0:53 ` [PATCH v2 2/3] KVM: X86: Implement PV sched yield hypercall Wanpeng Li
2019-05-28  2:15   ` [PATCH RESEND v2] " Wanpeng Li
2019-05-28  6:08     ` kbuild test robot
2019-05-28  6:14       ` Wanpeng Li
2019-05-28  7:23     ` kbuild test robot
2019-05-28  7:50   ` [PATCH RESEND v2 0/3] KVM: Yield to IPI target if necessary Wanpeng Li
2019-05-28  7:50     ` [PATCH RESEND v2 1/3] KVM: X86: Implement PV sched yield in linux guest Wanpeng Li
2019-05-28  7:50     ` [PATCH RESEND v2 2/3] KVM: X86: Implement PV sched yield hypercall Wanpeng Li
2019-05-28  7:50     ` [PATCH RESEND v2 3/3] KVM: X86: Expose PV_SCHED_YIELD CPUID feature bit to guest Wanpeng Li
2019-05-28  9:11   ` [PATCH v2 2/3] KVM: X86: Implement PV sched yield hypercall Christian Borntraeger
2019-05-28  9:57     ` Wanpeng Li [this message]
2019-05-29 12:28   ` Liran Alon
2019-05-30  1:09     ` Wanpeng Li
2019-05-28  0:53 ` [PATCH v2 3/3] KVM: X86: Expose PV_SCHED_YIELD CPUID feature bit to guest Wanpeng Li

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