* [PATCH v4] block: add documentation for io_timeout
@ 2018-12-26 3:56 Weiping Zhang
2019-01-03 17:13 ` Bart Van Assche
2019-01-05 2:20 ` Jens Axboe
0 siblings, 2 replies; 3+ messages in thread
From: Weiping Zhang @ 2018-12-26 3:56 UTC (permalink / raw)
To: axboe; +Cc: bvanassche, hch, linux-block
Add documentation for /sys/block/<disk>/queue/io_timeout.
Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
---
Documentation/ABI/testing/sysfs-block | 9 +++++++++
Documentation/block/queue-sysfs.txt | 7 +++++++
2 files changed, 16 insertions(+)
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
--
2.14.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v4] block: add documentation for io_timeout
2018-12-26 3:56 [PATCH v4] block: add documentation for io_timeout Weiping Zhang
@ 2019-01-03 17:13 ` Bart Van Assche
2019-01-05 2:20 ` Jens Axboe
1 sibling, 0 replies; 3+ messages in thread
From: Bart Van Assche @ 2019-01-03 17:13 UTC (permalink / raw)
To: Weiping Zhang, axboe; +Cc: hch, linux-block
On Wed, 2018-12-26 at 11:56 +0800, Weiping Zhang wrote:
> Add documentation for /sys/block/<disk>/queue/io_timeout.
>
> Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
> ---
> Documentation/ABI/testing/sysfs-block | 9 +++++++++
> Documentation/block/queue-sysfs.txt | 7 +++++++
> 2 files changed, 16 insertions(+)
>
> 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
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v4] block: add documentation for io_timeout
2018-12-26 3:56 [PATCH v4] block: add documentation for io_timeout Weiping Zhang
2019-01-03 17:13 ` Bart Van Assche
@ 2019-01-05 2:20 ` Jens Axboe
1 sibling, 0 replies; 3+ messages in thread
From: Jens Axboe @ 2019-01-05 2:20 UTC (permalink / raw)
To: bvanassche, hch, linux-block
On 12/25/18 8:56 PM, Weiping Zhang wrote:
> Add documentation for /sys/block/<disk>/queue/io_timeout.
Applied, thanks.
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-01-03 17:13 ` Bart Van Assche
2019-01-05 2:20 ` Jens Axboe
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