[PATCH 4/4] KVM: MMU: lower the aduit frequency

Xiao Guangrong
2010-08-28T12:03:00Z

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_debug.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu_debug.c b/arch/x86/kvm/mmu_debug.c
index c4ebe6a..bc61b3d 100644
--- a/arch/x86/kvm/mmu_debug.c
+++ b/arch/x86/kvm/mmu_debug.c
@@ -18,6 +18,7 @@
*/

#include <linux/debugfs.h>
+#include <linux/ratelimit.h>

static struct dentry *debugfs_file;
static bool mmu_debug;
@@ -233,6 +234,11 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu)

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