linux-kernel - [PATCH v2 1/9] KVM: X86: Add per-vm stat for max rmap list size

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Message-Id: <20210625153214.43106-2-peterx@redhat.com>
Date:   Fri, 25 Jun 2021 11:32:06 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, peterx@...hat.com,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v2 1/9] 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: Peter Xu <peterx@...hat.com>
---
 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