I added further optimization based on Avi's advice and my rmap_pde work. - patch [5-6]
The new test result was impressively good, see below, and THP page invalidation was more than 5 times faster on my x86 machine. I also noticed that GUI's responsiveness on the host during swapping the guest's memory improved a lot. 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(); ... Takuya Yoshikawa (6): 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: 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 | 42 +++++++++++++++----- arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/mmu.c | 72 +++++++++++++++++++++++------------ arch/x86/kvm/x86.c | 13 ++++++- include/linux/kvm_host.h | 8 ++++ virt/kvm/kvm_main.c | 3 +- 7 files changed, 104 insertions(+), 39 deletions(-) -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
