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doc: blk-ioprio: Bring the doc in line with the implementation

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Our system administrator have noted that the names 'rt-to-be' and
'all-to-idle' in the I/O priority policies table appeared without
explanations, leading to confusion. Let's bring these names in line
with the naming in the 'attribute' section.

Additionally,
1. Correct the interface name to 'io.prio.class'.
2. Add a table entry of 'promote-to-rt' for consistency.
3. Fix a typo of 'priority'.

Suggested-by: Yingfu Zhou <yingfu.zhou@shopee.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Tang Yizhou <yizhou.tang@shopee.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20231012024228.2161283-1-yizhou.tang@shopee.com
This commit is contained in:
Tang Yizhou 2023-10-12 10:42:28 +08:00 • committed by Jonathan Corbet
parent 16794ed32d
commit c1081a7b16
1 changed files with 6 additions and 4 deletions
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10
Documentation/admin-guide/cgroup-v2.rst
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@ -2023,7 +2023,7 @@ IO Priority
~~~~~~~~~~~
A single attribute controls the behavior of the I/O priority cgroup policy,
namely the blkio.prio.class attribute. The following values are accepted for
namely the io.prio.class attribute. The following values are accepted for
that attribute:
no-change
@ -2052,9 +2052,11 @@ The following numerical values are associated with the I/O priority policies:
+----------------+---+
| no-change | 0 |
+----------------+---+
| rt-to-be | 2 |
| promote-to-rt | 1 |
+----------------+---+
| all-to-idle | 3 |
| restrict-to-be | 2 |
+----------------+---+
| idle | 3 |
+----------------+---+
The numerical value that corresponds to each I/O priority class is as follows:
@ -2074,7 +2076,7 @@ The algorithm to set the I/O priority class for a request is as follows:
- If I/O priority class policy is promote-to-rt, change the request I/O
priority class to IOPRIO_CLASS_RT and change the request I/O priority
level to 4.
- If I/O priorityt class is not promote-to-rt, translate the I/O priority
- If I/O priority class policy is not promote-to-rt, translate the I/O priority
class policy into a number, then change the request I/O priority class
into the maximum of the I/O priority class policy number and the numerical
I/O priority class.