[PATCH v2 5/5] KVM: MMU: lower the aduit frequency

Xiao Guangrong
2010-08-30T10:22:24Z

The audit is very high overhead, so we need lower the frequency to assure the guest running

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/mmu_audit.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
index 3bde186..bd2b1be 100644
--- a/arch/x86/kvm/mmu_audit.c
+++ b/arch/x86/kvm/mmu_audit.c
@@ -17,6 +17,8 @@
*
*/

+#include <linux/ratelimit.h>
+
static const char *audit_msg;

typedef void (*inspect_spte_fn) (struct kvm_vcpu *vcpu, u64 *sptep, int level);
@@ -228,6 +230,11 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu)

static void kvm_mmu_audit(void *ignore, struct kvm_vcpu *vcpu, int audit_point)
{
+ static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
+
+ if (!__ratelimit(&ratelimit_state))
+ return;
+
audit_msg = audit_point_name[audit_point];
audit_all_active_sps(vcpu->kvm);
audit_vcpu_spte(vcpu);
--
1.7.0.4