From: Peter Xu <peterx@redhat.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
peterx@redhat.com, Sean Christopherson <seanjc@google.com>
Subject: [PATCH 1/9] KVM: X86: Add per-vm stat for max rmap list size
Date: Thu, 24 Jun 2021 14:13:48 -0400 [thread overview]
Message-ID: <20210624181356.10235-2-peterx@redhat.com> (raw)
In-Reply-To: <20210624181356.10235-1-peterx@redhat.com>
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>
---
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 55efbacfc244..937bc8021f7a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1138,6 +1138,7 @@ struct kvm_vm_stat {
ulong lpages;
ulong nx_lpage_splits;
ulong max_mmu_page_hash_collisions;
+ ulong 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 5e60b00e8e50..6dd338738118 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2602,6 +2602,8 @@ 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 bbc4e04e67ad..4aa3cc6ae5d4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -257,6 +257,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
VM_STAT("largepages", lpages, .mode = 0444),
VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
+ VM_STAT("max_mmu_rmap_size", max_mmu_rmap_size),
{ NULL }
};
--
2.31.1
next prev parent reply other threads:[~2021-06-24 18:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 18:13 [PATCH 0/9] KVM: X86: Some light optimizations on rmap logic Peter Xu
2021-06-24 18:13 ` Peter Xu [this message]
2021-06-24 18:13 ` [PATCH 2/9] KVM: Introduce kvm_get_kvm_safe() Peter Xu
2021-06-24 18:13 ` [PATCH 3/9] KVM: Allow to have arch-specific per-vm debugfs files Peter Xu
2021-06-24 18:13 ` [PATCH 4/9] KVM: X86: Introduce pte_list_count() helper Peter Xu
2021-06-24 18:13 ` [PATCH 5/9] KVM: X86: Introduce kvm_mmu_slot_lpages() helpers Peter Xu
2021-06-24 18:13 ` [PATCH 6/9] KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file Peter Xu
2021-06-24 18:22 ` Peter Xu
2021-06-24 18:13 ` [PATCH 7/9] KVM: X86: MMU: Tune PTE_LIST_EXT to be bigger Peter Xu
2021-06-24 18:15 ` [PATCH 8/9] KVM: X86: Optimize pte_list_desc with per-array counter Peter Xu
2021-06-24 22:53 ` Peter Xu
2021-06-24 18:15 ` [PATCH 9/9] KVM: X86: Optimize zapping rmap Peter Xu
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