Commit ec1cf69c authored by Peter Xu's avatar Peter Xu Committed by Paolo Bonzini
Browse files

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



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

Signed-off-by: default avatarPeter Xu <peterx@redhat.com>
Message-Id: <20210625153214.43106-2-peterx@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 7fa2a347

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

arch/x86/kvm/mmu/mmu.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

		}

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -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) ==