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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>
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@ -80,6 +80,7 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
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*/
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void kvm_flush_remote_tlbs(struct kvm *kvm)
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{
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++kvm->stat.generic.remote_tlb_flush_requests;
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kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
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}
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@ -1444,7 +1444,8 @@ struct _kvm_stats_desc {
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KVM_STATS_BASE_POW10, -9, sz)
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#define KVM_GENERIC_VM_STATS() \
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STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
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STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush), \
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STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush_requests)
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#define KVM_GENERIC_VCPU_STATS() \
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STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
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@ -80,6 +80,7 @@ struct kvm_mmu_memory_cache {
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struct kvm_vm_stat_generic {
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u64 remote_tlb_flush;
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u64 remote_tlb_flush_requests;
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};
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struct kvm_vcpu_stat_generic {
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@ -318,6 +318,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
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*/
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long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
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++kvm->stat.generic.remote_tlb_flush_requests;
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/*
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* We want to publish modifications to the page tables before reading
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* mode. Pairs with a memory barrier in arch-specific code.
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