linux-kernel - Re: [PATCH v4 0/3] KVM: Yield to IPI target if necessary

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Date:   Fri, 28 Jun 2019 15:29:58 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH v4 0/3] KVM: Yield to IPI target if necessary

ping again,
On Tue, 18 Jun 2019 at 17:00, Wanpeng Li <kernellwp@...il.com> wrote:
>
> ping, :)
> On Tue, 11 Jun 2019 at 20:23, Wanpeng Li <kernellwp@...il.com> wrote:
> >
> > The idea is from Xen, when sending a call-function IPI-many to vCPUs,
> > yield if any of the IPI target vCPUs was preempted. 17% performance
> > increasement 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).
> >
> > v3 -> v4:
> >  * check map->phys_map[dest_id]
> >  * more cleaner kvm_sched_yield()
> >
> > v2 -> v3:
> >  * add bounds-check on dest_id
> >
> > v1 -> v2:
> >  * check map is not NULL
> >  * check map->phys_map[dest_id] is not NULL
> >  * make kvm_sched_yield static
> >  * change dest_id to unsinged long
> >
> > Wanpeng Li (3):
> >   KVM: X86: Yield to IPI target if necessary
> >   KVM: X86: Implement PV sched yield hypercall
> >   KVM: X86: Expose PV_SCHED_YIELD CPUID feature bit to guest
> >
> >  Documentation/virtual/kvm/cpuid.txt      |  4 ++++
> >  Documentation/virtual/kvm/hypercalls.txt | 11 +++++++++++
> >  arch/x86/include/uapi/asm/kvm_para.h     |  1 +
> >  arch/x86/kernel/kvm.c                    | 21 +++++++++++++++++++++
> >  arch/x86/kvm/cpuid.c                     |  3 ++-
> >  arch/x86/kvm/x86.c                       | 21 +++++++++++++++++++++
> >  include/uapi/linux/kvm_para.h            |  1 +
> >  7 files changed, 61 insertions(+), 1 deletion(-)
> >
> > --
> > 2.7.4
> >