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block: add documentation for inflight

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Complements v2.6.32 commit a9327cac44 ("Seperate read and write
statistics of in_flight requests") and commit 316d315bff ("block:
Seperate read and write statistics of in_flight requests v2").

Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20211019130230.77594-1-maier@linux.ibm.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Steffen Maier 2021-10-19 15:02:30 +02:00 committed by Jonathan Corbet
parent a40a8a1103
commit 7b5f801231
1 changed files with 16 additions and 0 deletions
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Documentation/ABI/testing/sysfs-block
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@ -28,6 +28,22 @@ Description:
For more details refer Documentation/admin-guide/iostats.rst
What: /sys/block/<disk>/inflight
Date: October 2009
Contact: Jens Axboe <axboe@kernel.dk>, Nikanth Karthikesan <knikanth@suse.de>
Description:
Reports the number of I/O requests currently in progress
(pending / in flight) in a device driver. This can be less
than the number of requests queued in the block device queue.
The report contains 2 fields: one for read requests
and one for write requests.
The value type is unsigned int.
Cf. Documentation/block/stat.rst which contains a single value for
requests in flight.
This is related to nr_requests in Documentation/block/queue-sysfs.rst
and for SCSI device also its queue_depth.
What: /sys/block/<disk>/diskseq
Date: February 2021
Contact: Matteo Croce <mcroce@microsoft.com>