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KVM: X86: Add per-vm stat for max rmap list size

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Add a new statistic max_mmu_rmap_size, which stores the maximum size of rmap
for the vm.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210625153214.43106-2-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2021-06-25 11:32:06 -04:00 committed by Paolo Bonzini
parent 7fa2a34751
commit ec1cf69c37
3 changed files with 4 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -1209,6 +1209,7 @@ struct kvm_vm_stat {
u64 lpages;
u64 nx_lpage_splits;
u64 max_mmu_page_hash_collisions;
u64 max_mmu_rmap_size;
};
struct kvm_vcpu_stat {

2
arch/x86/kvm/mmu/mmu.c
View File

@ -2698,6 +2698,8 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
if (is_shadow_present_pte(*sptep)) {
if (!was_rmapped) {
rmap_count = rmap_add(vcpu, sptep, gfn);
if (rmap_count > vcpu->kvm->stat.max_mmu_rmap_size)
vcpu->kvm->stat.max_mmu_rmap_size = rmap_count;
if (rmap_count > RMAP_RECYCLE_THRESHOLD)
rmap_recycle(vcpu, sptep, gfn);
}

1
arch/x86/kvm/x86.c
View File

@ -235,6 +235,7 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
STATS_DESC_ICOUNTER(VM, mmu_unsync),
STATS_DESC_ICOUNTER(VM, lpages),
STATS_DESC_ICOUNTER(VM, nx_lpage_splits),
STATS_DESC_PCOUNTER(VM, max_mmu_rmap_size),
STATS_DESC_PCOUNTER(VM, max_mmu_page_hash_collisions)
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==