Commit bb351aba authored Dec 26, 2018 by Weiping Zhang Committed by Jens Axboe Jan 04, 2019

block: add documentation for io_timeout



Add documentation for /sys/block/<disk>/queue/io_timeout.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 59f75fd0

Documentation/ABI/testing/sysfs-block

+9 −0

Original line number	Diff line number	Diff line
		@@ -279,3 +279,12 @@ Description:
		size in 512B sectors of the zones of the device, with
		the eventual exception of the last zone of the device
		which may be smaller.

		What: /sys/block/<disk>/queue/io_timeout
		Date: November 2018
		Contact: Weiping Zhang <zhangweiping@didiglobal.com>
		Description:
		io_timeout is the request timeout in milliseconds. If a request
		does not complete in this time then the block driver timeout
		handler is invoked. That timeout handler can decide to retry
		the request, to fail it or to start a device recovery strategy.

Documentation/block/queue-sysfs.txt

+7 −0

Original line number	Diff line number	Diff line
		@@ -67,6 +67,13 @@ If set to a value larger than 0, the kernel will put the process issuing
		IO to sleep for this amount of microseconds before entering classic
		polling.

		io_timeout (RW)
		---------------
		io_timeout is the request timeout in milliseconds. If a request does not
		complete in this time then the block driver timeout handler is invoked.
		That timeout handler can decide to retry the request, to fail it or to start
		a device recovery strategy.

		iostats (RW)
		-------------
		This file is used to control (on/off) the iostats accounting of the