diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 0ea8698b2b1f..6e1c29860eec 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -25,6 +25,8 @@ static int throtl_quantum = 32;
 #define DFL_IDLE_THRESHOLD_SSD (1000L) /* 1 ms */
 #define DFL_IDLE_THRESHOLD_HD (100L * 1000) /* 100 ms */
 #define MAX_IDLE_TIME (5L * 1000 * 1000) /* 5 s */
+/* default latency target is 0, eg, guarantee IO latency by default */
+#define DFL_LATENCY_TARGET (0)
 
 static struct blkcg_policy blkcg_policy_throtl;
 
@@ -152,6 +154,7 @@ struct throtl_grp {
 
 	unsigned long last_check_time;
 
+	unsigned long latency_target; /* us */
 	/* When did we start a new slice */
 	unsigned long slice_start[2];
 	unsigned long slice_end[2];
@@ -449,6 +452,8 @@ static struct blkg_policy_data *throtl_pd_alloc(gfp_t gfp, int node)
 	tg->iops_conf[WRITE][LIMIT_MAX] = UINT_MAX;
 	/* LIMIT_LOW will have default value 0 */
 
+	tg->latency_target = DFL_LATENCY_TARGET;
+
 	return &tg->pd;
 }
 
@@ -1445,6 +1450,7 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
 	u64 bps_dft;
 	unsigned int iops_dft;
 	char idle_time[26] = "";
+	char latency_time[26] = "";
 
 	if (!dname)
 		return 0;
@@ -1461,8 +1467,9 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
 	    tg->bps_conf[WRITE][off] == bps_dft &&
 	    tg->iops_conf[READ][off] == iops_dft &&
 	    tg->iops_conf[WRITE][off] == iops_dft &&
-	    (off != LIMIT_LOW || tg->idletime_threshold ==
-				  tg->td->dft_idletime_threshold))
+	    (off != LIMIT_LOW ||
+	     (tg->idletime_threshold == tg->td->dft_idletime_threshold &&
+	      tg->latency_target == DFL_LATENCY_TARGET)))
 		return 0;
 
 	if (tg->bps_conf[READ][off] != bps_dft)
@@ -1483,10 +1490,17 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
 		else
 			snprintf(idle_time, sizeof(idle_time), " idle=%lu",
 				tg->idletime_threshold);
+
+		if (tg->latency_target == ULONG_MAX)
+			strcpy(latency_time, " latency=max");
+		else
+			snprintf(latency_time, sizeof(latency_time),
+				" latency=%lu", tg->latency_target);
 	}
 
-	seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s%s\n",
-		   dname, bufs[0], bufs[1], bufs[2], bufs[3], idle_time);
+	seq_printf(sf, "%s rbps=%s wbps=%s riops=%s wiops=%s%s%s\n",
+		   dname, bufs[0], bufs[1], bufs[2], bufs[3], idle_time,
+		   latency_time);
 	return 0;
 }
 
@@ -1505,6 +1519,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 	struct throtl_grp *tg;
 	u64 v[4];
 	unsigned long idle_time;
+	unsigned long latency_time;
 	int ret;
 	int index = of_cft(of)->private;
 
@@ -1520,6 +1535,7 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 	v[3] = tg->iops_conf[WRITE][index];
 
 	idle_time = tg->idletime_threshold;
+	latency_time = tg->latency_target;
 	while (true) {
 		char tok[27];	/* wiops=18446744073709551616 */
 		char *p;
@@ -1553,6 +1569,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 			v[3] = min_t(u64, val, UINT_MAX);
 		else if (off == LIMIT_LOW && !strcmp(tok, "idle"))
 			idle_time = val;
+		else if (off == LIMIT_LOW && !strcmp(tok, "latency"))
+			latency_time = val;
 		else
 			goto out_finish;
 	}
@@ -1583,6 +1601,8 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 			tg->td->limit_index = LIMIT_LOW;
 		tg->idletime_threshold = (idle_time == ULONG_MAX) ?
 			ULONG_MAX : idle_time;
+		tg->latency_target = (latency_time == ULONG_MAX) ?
+			ULONG_MAX : latency_time;
 	}
 	tg_conf_updated(tg);
 	ret = 0;