[PATCH 16/16] blk-mq: add documentation for new queue attribute async_dpeth

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 Documentation/ABI/stable/sysfs-block | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 0ed10aeff86b..09b9b3db9a1f 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -609,6 +609,16 @@ Description:
 		enabled, and whether tags are shared.
 
 
+What:		/sys/block/<disk>/queue/async_depth
+Date:		August 2025
+Contact:	linux-block@xxxxxxxxxxxxxxx
+Description:
+		[RW] This controls how many async requests may be allocated in the
+		block layer. If elevator is none, then this value is nr_requests.
+		By default, this value is 75% of nr_requests for bfq and kyber,
+		abd nr_requests for mq-deadline.
+
+
 What:		/sys/block/<disk>/queue/nr_zones
 Date:		November 2018
 Contact:	Damien Le Moal <damien.lemoal@xxxxxxx>
-- 
2.39.2