diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 7058765..d3c61b4 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -28,6 +28,8 @@
 	}
 
 	counter->usage += val;
+	if (counter->usage > counter->max_usage)
+		counter->max_usage = counter->usage;
 	return 0;
 }
 
@@ -66,6 +68,8 @@
 	switch (member) {
 	case RES_USAGE:
 		return &counter->usage;
+	case RES_MAX_USAGE:
+		return &counter->max_usage;
 	case RES_LIMIT:
 		return &counter->limit;
 	case RES_FAILCNT: