Messages in this thread | | | From | Wanpeng Li <> | Subject | [PATCH v3 0/3] KVM: Introduce dedicated vCPUs hint KVM_HINTS_DEDICATED | Date | Sun, 11 Feb 2018 11:29:43 +0800 |
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This patchset introduces dedicated vCPUs hint KVM_HINTS_DEDICATED, it has two users now:
1) Waiman Long mentioned that:
Generally speaking, unfair lock performs well for VMs with a small number of vCPUs. Native qspinlock may perform better than pvqspinlock if there is vCPU pinning and there is no vCPU over-commitment.
2) vCPUs are very unlikely to get preempted when they are the only task running on a CPU. PV TLB flush is slower that the native flush in that case.
v2 -> v3: * a separate table for CPUID[0x40000001].EDX bits * a new kvm_hint_has_feature macro v1 -> v2: * update to KVM_HINTS_DEDICATED
Wanpeng Li (3): KVM: Introduce dedicated vCPUs hint KVM_HINTS_DEDICATED KVM: X86: Choose qspinlock when dedicated vCPUs available KVM: X86: Don't use PV TLB flush with dedicated vCPUs and steal time disabled
Documentation/virtual/kvm/cpuid.txt | 12 +++++++++++- arch/mips/include/asm/kvm_para.h | 5 +++++ arch/powerpc/include/asm/kvm_para.h | 5 +++++ arch/s390/include/asm/kvm_para.h | 5 +++++ arch/x86/include/asm/kvm_para.h | 6 ++++++ arch/x86/include/uapi/asm/kvm_para.h | 8 ++++++-- arch/x86/kernel/kvm.c | 18 ++++++++++++++++-- include/asm-generic/kvm_para.h | 5 +++++ include/linux/kvm_para.h | 5 +++++ 9 files changed, 64 insertions(+), 5 deletions(-)
-- 2.7.4
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