linux-kernel - Re: [PATCH] blk-ioprio: Introduce promote-to-rt policy

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Date:   Wed, 1 Feb 2023 16:07:48 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Hou Tao <houtao@...weicloud.com>, linux-block@...r.kernel.org
Cc:     Bart Van Assche <bvanassche@....org>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>, cgroups@...r.kernel.org,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, houtao1@...wei.com
Subject: Re: [PATCH] blk-ioprio: Introduce promote-to-rt policy

On Wed, Feb 01, 2023 at 12:52:27PM +0800, Hou Tao wrote:
>  The following numerical values are associated with the I/O priority policies:
>  
> -+-------------+---+
> -| no-change   | 0 |
> -+-------------+---+
> -| none-to-rt  | 1 |
> -+-------------+---+
> -| rt-to-be    | 2 |
> -+-------------+---+
> -| all-to-idle | 3 |
> -+-------------+---+
> +
> ++---------------+---------+-----+
> +| policy        | inst    | num |
> ++---------------+---------+-----+
> +| no-change     | demote  | 0   |
> ++---------------+---------+-----+
> +| none-to-rt    | demote  | 1   |
> ++---------------+---------+-----+
> +| rt-to-be      | demote  | 2   |
> ++---------------+---------+-----+
> +| idle          | demote  | 3   |
> ++---------------+---------+-----+
> +| promote-to-rt | promote | 1   |
> ++---------------+---------+-----+
>  

The first row should have been header row:

---- >8 ----
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index e0b9f73ef62a9e..55f9b579716564 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -2048,7 +2048,7 @@ The following numerical values are associated with the I/O priority policies:
 
 +---------------+---------+-----+
 | policy        | inst    | num |
-+---------------+---------+-----+
++===============+=========+=====+
 | no-change     | demote  | 0   |
 +---------------+---------+-----+
 | none-to-rt    | demote  | 1   |

> @@ -2064,9 +2074,13 @@ The numerical value that corresponds to each I/O priority class is as follows:
>  
>  The algorithm to set the I/O priority class for a request is as follows:
>  
> -- Translate the I/O priority class policy into a number.
> -- 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.
> +-- Translate the I/O priority class policy into an instruction and a number
> +-- If the instruction is demotion, 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.
> +-- If the instruction is promotion, change the request I/O priority class
> +-  into the minimum of the I/O priority class policy number and the numerical
> +-  I/O priority class.
>  

Remove the excessive bullet list marker or the list above become paragraph
instead:

---- >8 ----
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 55f9b579716564..c3f16386c47bdf 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -2074,12 +2074,12 @@ The numerical value that corresponds to each I/O priority class is as follows:
 
 The algorithm to set the I/O priority class for a request is as follows:
 
--- Translate the I/O priority class policy into an instruction and a number
--- If the instruction is demotion, 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.
--- If the instruction is promotion, change the request I/O priority class
--  into the minimum of the I/O priority class policy number and the numerical
+- Translate the I/O priority class policy into an instruction-number pair.
+- If the instruction is demotion, 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.
+- If the instruction is promotion, change the request I/O priority class
+  into the minimum of the I/O priority class policy number and the numerical
 -  I/O priority class.
 
 PID

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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