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blk-mq: fix stale nr_requests documentation

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

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai
2025-09-10 16:04:45 +08:00
committed by Jens Axboe
parent 9784041145
commit a75fe12fa2
1 changed files with 4 additions and 10 deletions
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14
Documentation/ABI/stable/sysfs-block
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@@ -603,16 +603,10 @@ Date: July 2003
Contact: linux-block@vger.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