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SubjectRe: [PATCH v3 0/3] KVM: Yield to IPI target if necessary
ping, :)
On Thu, 30 May 2019 at 09:05, Wanpeng Li <kernellwp@gmail.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).
>
> 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 | 26 ++++++++++++++++++++++++++
> include/uapi/linux/kvm_para.h | 1 +
> 7 files changed, 66 insertions(+), 1 deletion(-)
>
> --
> 2.7.4
>

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