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    Subject[PATCH 0/8] KVM: Optimize MMU notifier's THP page invalidation -v4
    v3->v4: Resolved trace_kvm_age_page() issue -- patch 6,7
    v2->v3: Fixed intersection calculations. -- patch 3, 8

    Takuya

    Takuya Yoshikawa (8):
    KVM: MMU: Use __gfn_to_rmap() to clean up kvm_handle_hva()
    KVM: Introduce hva_to_gfn_memslot() for kvm_handle_hva()
    KVM: MMU: Make kvm_handle_hva() handle range of addresses
    KVM: Introduce kvm_unmap_hva_range() for kvm_mmu_notifier_invalidate_range_start()
    KVM: Separate rmap_pde from kvm_lpage_info->write_count
    KVM: MMU: Add memslot parameter to hva handlers
    KVM: MMU: Push trace_kvm_age_page() into kvm_age_rmapp()
    KVM: MMU: Avoid handling same rmap_pde in kvm_handle_hva_range()

    arch/powerpc/include/asm/kvm_host.h | 2 +
    arch/powerpc/kvm/book3s_64_mmu_hv.c | 47 ++++++++++++---
    arch/x86/include/asm/kvm_host.h | 3 +-
    arch/x86/kvm/mmu.c | 107 +++++++++++++++++++++++------------
    arch/x86/kvm/x86.c | 11 ++++
    include/linux/kvm_host.h | 8 +++
    virt/kvm/kvm_main.c | 3 +-
    7 files changed, 131 insertions(+), 50 deletions(-)


    From v2:

    The new test result was impressively good, see below, and THP page
    invalidation was more than 5 times faster on my x86 machine.

    Before:
    ...
    19.852 us | __mmu_notifier_invalidate_range_start();
    28.033 us | __mmu_notifier_invalidate_range_start();
    19.066 us | __mmu_notifier_invalidate_range_start();
    44.715 us | __mmu_notifier_invalidate_range_start();
    31.613 us | __mmu_notifier_invalidate_range_start();
    20.659 us | __mmu_notifier_invalidate_range_start();
    19.979 us | __mmu_notifier_invalidate_range_start();
    20.416 us | __mmu_notifier_invalidate_range_start();
    20.632 us | __mmu_notifier_invalidate_range_start();
    22.316 us | __mmu_notifier_invalidate_range_start();
    ...

    After:
    ...
    4.089 us | __mmu_notifier_invalidate_range_start();
    4.096 us | __mmu_notifier_invalidate_range_start();
    3.560 us | __mmu_notifier_invalidate_range_start();
    3.376 us | __mmu_notifier_invalidate_range_start();
    3.772 us | __mmu_notifier_invalidate_range_start();
    3.353 us | __mmu_notifier_invalidate_range_start();
    3.332 us | __mmu_notifier_invalidate_range_start();
    3.332 us | __mmu_notifier_invalidate_range_start();
    3.332 us | __mmu_notifier_invalidate_range_start();
    3.337 us | __mmu_notifier_invalidate_range_start();
    ...


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