Add a new statistic max_mmu_rmap_size, which stores the maximum size of rmap
for the vm.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/mmu/mmu.c | 2 ++
arch/x86/kvm/x86.c | 1 +
3 files changed, 4 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 974cbfb1eefe..d798650ad793 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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 {
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b888385d1933..eb16c1dbbb32 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2696,6 +2696,8 @@ 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);
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8166ad113fb2..d83ccf35ce99 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -237,6 +237,7 @@ 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) ==
--
2.31.1
