diff options
| author |   Jing Zhang <jingzhangos@google.com> | 2021-08-17 00:26:39 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-09-06 06:30:45 -0400 |
| commit | 3cc4e148b96263313e3dce926eae569c942bb74e (patch) | |
| tree | 5fad27d657f971485b97da0ee0c3970e996b539e | |
| parent | KVM: Remove unnecessary export of kvm_{inc,dec}_notifier_count() (diff) | |
| download | linux-dev-3cc4e148b96263313e3dce926eae569c942bb74e.tar.xz linux-dev-3cc4e148b96263313e3dce926eae569c942bb74e.zip | |
KVM: stats: Add VM stat for remote tlb flush requests
Add a new stat that counts the number of times a remote TLB flush is
requested, regardless of whether it kicks vCPUs out of guest mode. This
allows us to look at how often flushes are initiated.
Unlike remote_tlb_flush, this one applies to ARM's instruction-set-based
TLB flush implementation, so apply it there too.
Original-by: David Matlack <dmatlack@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
Message-Id: <20210817002639.3856694-1-jingzhangos@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/arm64/kvm/mmu.c | 1 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 3 | ||||
| -rw-r--r-- | include/linux/kvm_types.h | 1 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 1 |
4 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 0625bf2353c2..f5bb235bbb59 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -80,6 +80,7 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot) */ void kvm_flush_remote_tlbs(struct kvm *kvm) { + ++kvm->stat.generic.remote_tlb_flush_requests; kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu); } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index e4d712e9f760..c177789a8542 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1444,7 +1444,8 @@ struct _kvm_stats_desc { KVM_STATS_BASE_POW10, -9, sz) #define KVM_GENERIC_VM_STATS() \ - STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush) + STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \ + STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests) #define KVM_GENERIC_VCPU_STATS() \ STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \ diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h index de7fb5f364d8..2237abb93ccd 100644 --- a/include/linux/kvm_types.h +++ b/include/linux/kvm_types.h @@ -80,6 +80,7 @@ struct kvm_mmu_memory_cache { struct kvm_vm_stat_generic { u64 remote_tlb_flush; + u64 remote_tlb_flush_requests; }; struct kvm_vcpu_stat_generic { diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 140c7d311021..305956310174 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -318,6 +318,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) */ long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); + ++kvm->stat.generic.remote_tlb_flush_requests; /* * We want to publish modifications to the page tables before reading * mode. Pairs with a memory barrier in arch-specific code. |