linux-kernel - Re: [PATCH] Documentation: block: ioprio: Update schedulers

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Message-ID: <8085ea13-29d2-46bd-8ca9-407d22266d0c@wdc.com>
Date: Wed, 17 Jan 2024 12:49:53 +0000
From: Johannes Thumshirn <Johannes.Thumshirn@....com>
To: Christian Loehle <christian.loehle@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>, "bvanassche@....org"
	<bvanassche@....org>, "linux-block@...r.kernel.org"
	<linux-block@...r.kernel.org>, "corbet@....net" <corbet@....net>
Subject: Re: [PATCH] Documentation: block: ioprio: Update schedulers

On 17.01.24 13:20, Christian Loehle wrote:
> This doc hasn't been touched in a while, in the meantime some
> new io schedulers were added (e.g. all of mq), some with ioprio
> support.
> 
> Signed-off-by: Christian Loehle <christian.loehle@....com>
> ---
>   Documentation/block/ioprio.rst | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/block/ioprio.rst b/Documentation/block/ioprio.rst
> index a25c6d5df87b..5410308888d2 100644
> --- a/Documentation/block/ioprio.rst
> +++ b/Documentation/block/ioprio.rst
> @@ -9,14 +9,14 @@ Intro
>   With the introduction of cfq v3 (aka cfq-ts or time sliced cfq), basic io
>   priorities are supported for reads on files.  This enables users to io nice
>   processes or process groups, similar to what has been possible with cpu
> -scheduling for ages.  This document mainly details the current possibilities
> -with cfq; other io schedulers do not support io priorities thus far.
> +scheduling for ages. Support for io priorities is io scheduler dependent and
> +currently supported by bfq, mq-deadline and cfq.

CFQ went away with blk-mq and got replaced by BFQ IIRC.


>   
>   Scheduling classes
>   ------------------
>   
> -CFQ implements three generic scheduling classes that determine how io is
> -served for a process.
> +Three generic scheduling classes are implemented for io priorities that
> +determine how io is served for a process.
>   
>   IOPRIO_CLASS_RT: This is the realtime io class. This scheduling class is given
>   higher priority than any other in the system, processes from this class are