linux-kernel - [PATCH 15/16] blk-mq: fix stale nr

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Message-Id: <20250814033522.770575-16-yukuai1@huaweicloud.com>
Date: Thu, 14 Aug 2025 11:35:21 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	yukuai3@...wei.com,
	bvanassche@....org,
	nilay@...ux.ibm.com,
	hare@...e.de,
	ming.lei@...hat.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH 15/16] blk-mq: fix stale nr_requests documentation

From: Yu Kuai <yukuai3@...wei.com>

The nr_requests documentation is still the removed single queue, remove
it and update to current blk-mq.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 Documentation/ABI/stable/sysfs-block | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 0ddffc9133d0..0ed10aeff86b 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -603,16 +603,10 @@ Date:		July 2003
 Contact:	linux-block@...r.kernel.org
 Description:
 		[RW] This controls how many requests may be allocated in the
-		block layer for read or write requests. Note that the total
-		allocated number may be twice this amount, since it applies only
-		to reads or writes (not the accumulated sum).
-
-		To avoid priority inversion through request starvation, a
-		request queue maintains a separate request pool per each cgroup
-		when CONFIG_BLK_CGROUP is enabled, and this parameter applies to
-		each such per-block-cgroup request pool.  IOW, if there are N
-		block cgroups, each request queue may have up to N request
-		pools, each independently regulated by nr_requests.
+		block layer. Noted this value only represents the quantity for a
+		single blk_mq_tags instance. The actual number for the entire
+		device depends on the hardware queue count, whether elevator is
+		enabled, and whether tags are shared.
 
 
 What:		/sys/block/<disk>/queue/nr_zones
-- 
2.39.2