diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c99fc326ec24..71c27133c53c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -26,6 +26,8 @@
  */
 #include "sched.h"
 
+#include <linux/math64.h>
+
 /*
  * Targeted preemption latency for CPU-bound tasks:
  *
@@ -127,7 +129,7 @@ int __weak arch_asym_cpu_priority(int cpu)
 
 #endif
 #ifdef CONFIG_CACULE_SCHED
-int cacule_max_lifetime					= 30000; // in ms
+int cacule_max_lifetime					= 4000; // in ms
 int cacule_harsh_mode					= 0;
 int interactivity_factor				= 32768;
 #endif
@@ -602,6 +604,7 @@ calc_interactivity(u64 now, struct cacule_node *se)
 {
 	u64 l_se, vr_se, sleep_se = 1ULL, u64_factor;
 	unsigned int score_se;
+	u32 r_se_rem;
 
 	/*
 	 * in case of vruntime==0, logical OR with 1 would
@@ -616,9 +619,19 @@ calc_interactivity(u64 now, struct cacule_node *se)
 		sleep_se = (l_se - vr_se) | 1;
 
 	if (sleep_se >= vr_se)
-		score_se = u64_factor / (sleep_se / vr_se);
+		score_se = div_u64_rem
+			(
+				u64_factor, div_u64_rem
+				(
+					sleep_se, vr_se
+				, &r_se_rem)
+			, &r_se_rem);
 	else
-		score_se = (u64_factor << 1) - (u64_factor / (vr_se / sleep_se));
+		score_se = (u64_factor << 1) - (
+			div_u64_rem(u64_factor, (
+					div_u64_rem(vr_se, sleep_se, &r_se_rem)
+				), &r_se_rem)
+			);
 
 	return score_se;
 }
@@ -1041,6 +1054,7 @@ static void reset_lifetime(u64 now, struct sched_entity *se)
 	struct cacule_node *cn;
 	u64 max_life_ns, life_time;
 	s64 diff;
+	u32 rem;
 
 	/*
 	 * left shift 20 bits is approximately = * 1000000
@@ -1054,9 +1068,9 @@ static void reset_lifetime(u64 now, struct sched_entity *se)
 		life_time	= now - cn->cacule_start_time;
 		diff		= life_time - max_life_ns;
 
-		if (unlikely(diff > 0)) {
+		if (diff > 0) {
 			// multiply life_time by 8 for more precision
-			u64 old_hrrn_x8	= life_time / ((cn->vruntime >> 3) | 1);
+			u64 old_hrrn_x8	= div_u64_rem(life_time, ((cn->vruntime >> 3) | 1), &rem);
 
 			// reset life to half max_life (i.e ~15s)
 			cn->cacule_start_time = now - (max_life_ns >> 1);
@@ -1065,7 +1079,7 @@ static void reset_lifetime(u64 now, struct sched_entity *se)
 			if (old_hrrn_x8 == 0) old_hrrn_x8 = 1;
 
 			// reset vruntime based on old hrrn ratio
-			cn->vruntime = (max_life_ns << 2) / old_hrrn_x8;
+			cn->vruntime = div_u64_rem((max_life_ns << 2), old_hrrn_x8, &rem);
 		}
 	}
 }