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* [PATCH v2 0/3] KVM: Yield to IPI target if necessary
@ 2019-05-28  0:53 Wanpeng Li
  2019-05-28  0:53 ` [PATCH v2 1/3] KVM: X86: Implement PV sched yield in linux guest Wanpeng Li
                   ` (2 more replies)
  0 siblings, 3 replies; 17+ messages in thread
From: Wanpeng Li @ 2019-05-28  0:53 UTC (permalink / raw)
  To: linux-kernel, kvm; +Cc: Paolo Bonzini, Radim Krčmář

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% 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).

v1 -> v2:
 * check map is not NULL
 * check map->phys_map[dest_id] is not NULL

Wanpeng Li (3):
  KVM: X86: Implement PV sched yield in linux guest
  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                       | 24 ++++++++++++++++++++++++
 include/uapi/linux/kvm_para.h            |  1 +
 7 files changed, 64 insertions(+), 1 deletion(-)

-- 
2.7.4


^ permalink raw reply	[flat|nested] 17+ messages in thread
* [PATCH RESEND v2 0/3] KVM: Yield to IPI target if necessary
@ 2019-05-28  7:56 Wanpeng Li
  0 siblings, 0 replies; 17+ messages in thread
From: Wanpeng Li @ 2019-05-28  7:56 UTC (permalink / raw)
  To: linux-kernel, kvm; +Cc: Paolo Bonzini, Radim Krčmář

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 
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).

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: Implement PV sched yield in linux guest
  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


^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2019-05-30  1:10 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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
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
2019-05-28  7:56 [PATCH RESEND v2 0/3] KVM: Yield to IPI target if necessary Wanpeng Li

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