diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 1fe9a553c37b..e5fedecf7bdf 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -358,8 +358,12 @@ What:		/sys/block/<disk>/queue/iostats
 Date:		January 2009
 Contact:	linux-block@vger.kernel.org
 Description:
-		[RW] This file is used to control (on/off) the iostats
-		accounting of the disk.
+		[RW] This file is used to control the iostats accounting of the
+		disk. If this value is 0, iostats accounting is disabled; If
+		this value is 1, iostats accounting is enabled, but io_ticks is
+		accounted by sampling and the result is not accurate; If this
+		value is 2, iostats accounting is enabled and io_ticks is
+		accounted precisely, but there will be slightly overhead.
 
 
 What:		/sys/block/<disk>/queue/logical_block_size
diff --git a/block/blk-core.c b/block/blk-core.c
index 9520ccab3050..f0d347ab0f34 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -956,9 +956,13 @@ void update_io_ticks(struct block_device *part, unsigned long now, bool end)
 	unsigned long stamp;
 again:
 	stamp = READ_ONCE(part->bd_stamp);
-	if (unlikely(time_after(now, stamp))) {
-		if (likely(try_cmpxchg(&part->bd_stamp, &stamp, now)))
-			__part_stat_add(part, io_ticks, end ? now - stamp : 1);
+	if (unlikely(time_after(now, stamp)) &&
+	    likely(try_cmpxchg(&part->bd_stamp, &stamp, now))) {
+		if (end || (blk_queue_precise_io_stat(part->bd_queue) &&
+			    part_in_flight(part)))
+			__part_stat_add(part, io_ticks, now - stamp);
+		else
+			__part_stat_add(part, io_ticks, 1);
 	}
 	if (part->bd_partno) {
 		part = bdev_whole(part);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 2d470cf2173e..ea5553766f90 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -779,6 +779,9 @@ static void blk_account_io_merge_request(struct request *req)
 	if (blk_do_io_stat(req)) {
 		part_stat_lock();
 		part_stat_inc(req->part, merges[op_stat_group(req_op(req))]);
+		if (req->rq_flags & RQF_PRECISE_IO_STAT)
+			part_stat_local_dec(req->part,
+					in_flight[op_is_write(req_op(req))]);
 		part_stat_unlock();
 	}
 }
diff --git a/block/blk-mq.c b/block/blk-mq.c
index fb29ff5cc281..0cb0e8db9dfd 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -360,8 +360,11 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
 
 	if (data->flags & BLK_MQ_REQ_PM)
 		data->rq_flags |= RQF_PM;
-	if (blk_queue_io_stat(q))
+	if (blk_queue_io_stat(q)) {
 		data->rq_flags |= RQF_IO_STAT;
+		if (blk_queue_precise_io_stat(q))
+			data->rq_flags |= RQF_PRECISE_IO_STAT;
+	}
 	rq->rq_flags = data->rq_flags;
 
 	if (data->rq_flags & RQF_SCHED_TAGS) {
@@ -999,6 +1002,9 @@ static inline void blk_account_io_done(struct request *req, u64 now)
 		update_io_ticks(req->part, jiffies, true);
 		part_stat_inc(req->part, ios[sgrp]);
 		part_stat_add(req->part, nsecs[sgrp], now - req->start_time_ns);
+		if (req->rq_flags & RQF_PRECISE_IO_STAT)
+			part_stat_local_dec(req->part,
+					in_flight[op_is_write(req_op(req))]);
 		part_stat_unlock();
 	}
 }
@@ -1006,7 +1012,6 @@ static inline void blk_account_io_done(struct request *req, u64 now)
 static inline void blk_account_io_start(struct request *req)
 {
 	trace_block_io_start(req);
-
 	if (blk_do_io_stat(req)) {
 		/*
 		 * All non-passthrough requests are created from a bio with one
@@ -1021,6 +1026,9 @@ static inline void blk_account_io_start(struct request *req)
 
 		part_stat_lock();
 		update_io_ticks(req->part, jiffies, false);
+		if (req->rq_flags & RQF_PRECISE_IO_STAT)
+			part_stat_local_inc(req->part,
+					in_flight[op_is_write(req_op(req))]);
 		part_stat_unlock();
 	}
 }
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 40bab5975c56..ce22dc29b5f1 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -303,7 +303,6 @@ queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
 
 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
-QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
 QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
 #undef QUEUE_SYSFS_BIT_FNS
 
@@ -468,6 +467,45 @@ static ssize_t queue_dax_show(struct request_queue *q, char *page)
 	return queue_var_show(blk_queue_dax(q), page);
 }
 
+static ssize_t queue_iostats_show(struct request_queue *q, char *page)
+{
+	int val = 0;
+
+	if (blk_queue_io_stat(q))
+		val = blk_queue_precise_io_stat(q) ? 2 : 1;
+
+	return sprintf(page, "%u\n", val);
+}
+
+static ssize_t
+queue_iostats_store(struct request_queue *q, const char *page, size_t count)
+{
+	unsigned long nr;
+	int ret = queue_var_store(&nr, page, count);
+
+	if (ret < 0)
+		return ret;
+
+	switch (nr) {
+	case 0:
+		blk_queue_flag_clear(QUEUE_FLAG_IO_STAT, q);
+		blk_queue_flag_clear(QUEUE_FLAG_PRECISE_IO_STAT, q);
+		break;
+	case 1:
+		blk_queue_flag_set(QUEUE_FLAG_IO_STAT, q);
+		blk_queue_flag_clear(QUEUE_FLAG_PRECISE_IO_STAT, q);
+		break;
+	case 2:
+		blk_queue_flag_set(QUEUE_FLAG_IO_STAT, q);
+		blk_queue_flag_set(QUEUE_FLAG_PRECISE_IO_STAT, q);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return count;
+}
+
 #define QUEUE_RO_ENTRY(_prefix, _name)			\
 static struct queue_sysfs_entry _prefix##_entry = {	\
 	.attr	= { .name = _name, .mode = 0444 },	\
@@ -489,6 +527,7 @@ QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
 QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
 QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
 QUEUE_RW_ENTRY(elv_iosched, "scheduler");
+QUEUE_RW_ENTRY(queue_iostats, "iostats");
 
 QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
 QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
@@ -534,7 +573,6 @@ static struct queue_sysfs_entry queue_hw_sector_size_entry = {
 };
 
 QUEUE_RW_ENTRY(queue_nonrot, "rotational");
-QUEUE_RW_ENTRY(queue_iostats, "iostats");
 QUEUE_RW_ENTRY(queue_random, "add_random");
 QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes");
 
diff --git a/block/blk.h b/block/blk.h
index 1ef920f72e0f..1154e87a4022 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -344,6 +344,7 @@ static inline bool blk_do_io_stat(struct request *rq)
 }
 
 void update_io_ticks(struct block_device *part, unsigned long now, bool end);
+unsigned int part_in_flight(struct block_device *part);
 
 static inline void req_set_nomerge(struct request_queue *q, struct request *req)
 {
diff --git a/block/genhd.c b/block/genhd.c
index d74fb5b4ae68..92d03cd24c79 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -118,7 +118,7 @@ static void part_stat_read_all(struct block_device *part,
 	}
 }
 
-static unsigned int part_in_flight(struct block_device *part)
+unsigned int part_in_flight(struct block_device *part)
 {
 	unsigned int inflight = 0;
 	int cpu;
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a676e116085f..bd925421bc4a 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -44,6 +44,7 @@ typedef __u32 __bitwise req_flags_t;
 #define RQF_QUIET		((__force req_flags_t)(1 << 11))
 /* account into disk and partition IO statistics */
 #define RQF_IO_STAT		((__force req_flags_t)(1 << 13))
+#define RQF_PRECISE_IO_STAT	((__force req_flags_t)(1 << 14))
 /* runtime pm request */
 #define RQF_PM			((__force req_flags_t)(1 << 15))
 /* on IO scheduler merge hash */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 94701a63ad8a..575099f28a8e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -517,6 +517,7 @@ struct request_queue {
 #define QUEUE_FLAG_NONROT	6	/* non-rotational device (SSD) */
 #define QUEUE_FLAG_VIRT		QUEUE_FLAG_NONROT /* paravirt device */
 #define QUEUE_FLAG_IO_STAT	7	/* do disk/partitions IO accounting */
+#define QUEUE_FLAG_PRECISE_IO_STAT 8	/* do disk/partitions IO accounting precisely */
 #define QUEUE_FLAG_NOXMERGES	9	/* No extended merges */
 #define QUEUE_FLAG_ADD_RANDOM	10	/* Contributes to random pool */
 #define QUEUE_FLAG_SYNCHRONOUS	11	/* always completes in submit context */
@@ -557,6 +558,8 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
 #define blk_queue_stable_writes(q) \
 	test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
 #define blk_queue_io_stat(q)	test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
+#define blk_queue_precise_io_stat(q) \
+	test_bit(QUEUE_FLAG_PRECISE_IO_STAT, &(q)->queue_flags)
 #define blk_queue_add_random(q)	test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
 #define blk_queue_zone_resetall(q)	\
 	test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
