diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9a8d7d4..97a4fae 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -508,7 +508,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 	else
 		f2fs_build_free_nids(sbi, false, false);
 
-	if (!is_idle(sbi) &&
+	if (!is_idle(sbi, REQ_TIME) &&
 		(!excess_dirty_nats(sbi) && !excess_dirty_nodes(sbi)))
 		return;
 
@@ -1308,7 +1308,7 @@ static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
 		if (dc->state != D_PREP)
 			goto next;
 
-		if (dpolicy->io_aware && !is_idle(sbi)) {
+		if (dpolicy->io_aware && !is_idle(sbi, DISCARD_TIME)) {
 			io_interrupted = true;
 			break;
 		}
@@ -1368,7 +1368,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
 			f2fs_bug_on(sbi, dc->state != D_PREP);
 
 			if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
-								!is_idle(sbi)) {
+						!is_idle(sbi, DISCARD_TIME)) {
 				io_interrupted = true;
 				break;
 			}
@@ -1561,8 +1561,6 @@ static int issue_discard_thread(void *data)
 	struct discard_policy dpolicy;
 	unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
 	int issued;
-	unsigned long interval = sbi->interval_time[REQ_TIME] * HZ;
-	long delta;
 
 	set_freezable();
 
@@ -1599,10 +1597,8 @@ static int issue_discard_thread(void *data)
 			__wait_all_discard_cmd(sbi, &dpolicy);
 			wait_ms = dpolicy.min_interval;
 		} else if (issued == -1){
-			delta = (sbi->last_time[REQ_TIME] + interval) - jiffies;
-			if (delta > 0)
-				wait_ms = jiffies_to_msecs(delta);
-			else
+			wait_ms = f2fs_time_to_wait(sbi, DISCARD_TIME);
+			if (!wait_ms)
 				wait_ms = dpolicy.mid_interval;
 		} else {
 			wait_ms = dpolicy.max_interval;