Hi all, As mentioned in the KVM forum talk from 2019 (https://kvmforum2019.sched.com/event/Tmwf/kvmstat-and-beyond-past-present-and-future-of-performance-monitoring-christian-borntrager-ibm page 10), there is few event counters for kvm_stat in the arm64 version of kvm when you compare it to something like the x86 version. Those counters are used in kvm_stat by kernel/driver developers to have a rough idea of the impact of their patches on the general performance. An example would be to make sure a patch don't increase to much the amount of interruptions. Those patches aim to add more counters to make the use of kvm_stat more relevant when measuring performance impact. I am new in working on kernel-related things and I am learning kvm as I go. Some of the counter I added early (memory_slot_unmaped, stage2_unmap_vm) no longer seems relevant because while they do interesting things, they happens in very specific scenarios. Instead of just deleting them, I prefer to ask weither a little-used counter or no counter is the best. I can also use some suggestion on how to test those counters as some like remote_tlb_flush which mostly happen when fixing up a race condition; or what uncovered event could be worth adding in a future patch set. Yoan Picchi (7): KVM: arm64: Add two page mapping counters for kvm_stat KVM: arm64: Add remote_tlb_flush counter for kvm_stat KVM: arm64: Add cached_page_invalidated counter for kvm_stat KVM: arm64: Add flush_all_cache_lines counter for kvm_stat KVM: arm64: Add memory_slot_unmaped counter for kvm_stat KVM: arm64: Add stage2_unmap_vm counter for kvm_stat KVM: arm64: Add irq_inject counter for kvm_stat arch/arm64/include/asm/kvm_host.h | 8 ++++++++ arch/arm64/kvm/arm.c | 2 ++ arch/arm64/kvm/guest.c | 9 +++++++++ arch/arm64/kvm/mmu.c | 27 ++++++++++++++++++++++++++- arch/arm64/kvm/vgic/vgic.c | 2 ++ 5 files changed, 47 insertions(+), 1 deletion(-) -- 2.17.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
