KVM: Add statistic for remote tlb flushes

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index b65f5de..048849d 100644 (file)
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -300,6 +300,7 @@ struct kvm_vm_stat {
        u32 mmu_pde_zapped;
        u32 mmu_flooded;
        u32 mmu_recycled;
+       u32 remote_tlb_flush;
 };
 
 struct kvm {

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 7939b5c..aec6b67 100644 (file)
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -115,6 +115,9 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
                if (cpu != -1 && cpu != raw_smp_processor_id())
                        cpu_set(cpu, cpus);
        }
+       if (cpus_empty(cpus))
+               return;
+       ++kvm->stat.remote_tlb_flush;
        smp_call_function_mask(cpus, ack_flush, NULL, 1);
 }
 

diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index b482b6a..ac09f38 100644 (file)
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -73,6 +73,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
        { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
        { "mmu_flooded", VM_STAT(mmu_flooded) },
        { "mmu_recycled", VM_STAT(mmu_recycled) },
+       { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
        { NULL }
 };