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    FromAvi Kivity <>
    Subject[PATCH 08/52] KVM: MMU: Add some mmu statistics
    DateSun, 30 Dec 2007 09:09:54 +0200
    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
     drivers/kvm/kvm.h |    6 ++++++
     drivers/kvm/mmu.c |    9 ++++++++-
     drivers/kvm/x86.c |    6 ++++++
     3 files changed, 20 insertions(+), 1 deletions(-)
    diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
    index d3171f9..bdcc44e 100644
    --- a/drivers/kvm/kvm.h
    +++ b/drivers/kvm/kvm.h
    @@ -362,6 +362,12 @@ struct kvm_memory_slot {
     };
     
     struct kvm_vm_stat {
    +	u32 mmu_shadow_zapped;
    +	u32 mmu_pte_write;
    +	u32 mmu_pte_updated;
    +	u32 mmu_pde_zapped;
    +	u32 mmu_flooded;
    +	u32 mmu_recycled;
     };
     
     struct kvm {
    diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
    index 9be54a5..87d8e70 100644
    --- a/drivers/kvm/mmu.c
    +++ b/drivers/kvm/mmu.c
    @@ -755,6 +755,7 @@ static void kvm_mmu_zap_page(struct kvm *kvm,
     {
     	u64 *parent_pte;
     
    +	++kvm->stat.mmu_shadow_zapped;
     	while (page->multimapped || page->parent_pte) {
     		if (!page->multimapped)
     			parent_pte = page->parent_pte;
    @@ -1226,9 +1227,12 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
     				  const void *new, int bytes,
     				  int offset_in_pte)
     {
    -	if (page->role.level != PT_PAGE_TABLE_LEVEL)
    +	if (page->role.level != PT_PAGE_TABLE_LEVEL) {
    +		++vcpu->kvm->stat.mmu_pde_zapped;
     		return;
    +	}
     
    +	++vcpu->kvm->stat.mmu_pte_updated;
     	if (page->role.glevels == PT32_ROOT_LEVEL)
     		paging32_update_pte(vcpu, page, spte, new, bytes,
     				    offset_in_pte);
    @@ -1263,6 +1267,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
     	int npte;
     
     	pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
    +	++vcpu->kvm->stat.mmu_pte_write;
     	kvm_mmu_audit(vcpu, "pre pte write");
     	if (gfn == vcpu->last_pt_write_gfn
     	    && !last_updated_pte_accessed(vcpu)) {
    @@ -1296,6 +1301,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
     			pgprintk("misaligned: gpa %llx bytes %d role %x\n",
     				 gpa, bytes, page->role.word);
     			kvm_mmu_zap_page(vcpu->kvm, page);
    +			++vcpu->kvm->stat.mmu_flooded;
     			continue;
     		}
     		page_offset = offset;
    @@ -1344,6 +1350,7 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
     		page = container_of(vcpu->kvm->active_mmu_pages.prev,
     				    struct kvm_mmu_page, link);
     		kvm_mmu_zap_page(vcpu->kvm, page);
    +		++vcpu->kvm->stat.mmu_recycled;
     	}
     }
     
    diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
    index 016abc3..fdc7632 100644
    --- a/drivers/kvm/x86.c
    +++ b/drivers/kvm/x86.c
    @@ -66,6 +66,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
     	{ "fpu_reload", VCPU_STAT(fpu_reload) },
     	{ "insn_emulation", VCPU_STAT(insn_emulation) },
     	{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
    +	{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
    +	{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
    +	{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
    +	{ "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
    +	{ "mmu_flooded", VM_STAT(mmu_flooded) },
    +	{ "mmu_recycled", VM_STAT(mmu_recycled) },
     	{ NULL }
     };
     
    -- 
    1.5.3.7
    
    
    
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