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SubjectRe: [PATCH 0/8] KVM: Optimize MMU notifier's THP page invalidation -v4
On Mon, Jul 02, 2012 at 05:52:39PM +0900, Takuya Yoshikawa wrote:
> 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();
> ...

Neat.

Andrea can you please ACK?



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