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| author | Weiping Zhang <zhangweiping@didiglobal.com> | 2018-12-26 11:56:33 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-01-04 19:19:51 -0700 |
| commit | bb351abaf5cd4f9237e1b3094d9cc04853de6d95 (patch) | |
| tree | 0173b76e9df11f30e15aaaff05a0575dc6b89f19 /Documentation | |
| parent | 59f75fd0e31532bdcf65f754516cac2954d5ddc7 (diff) | |
| download | blackbird-obmc-linux-bb351abaf5cd4f9237e1b3094d9cc04853de6d95.tar.gz blackbird-obmc-linux-bb351abaf5cd4f9237e1b3094d9cc04853de6d95.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 9 | ||||
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 7 |
2 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index 7710d4022b19..dfad7427817c 100644 --- a/Documentation/ABI/testing/sysfs-block +++ b/Documentation/ABI/testing/sysfs-block @@ -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. diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index 39e286d7afc9..83b457e24bba 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt @@ -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 |
