linux-kernel - Re: [PATCH] sched: RT bandwidth interface for cgroup unified hierarchy

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Date:   Tue, 21 Jun 2022 08:59:42 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Chengming Zhou <zhouchengming@...edance.com>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, tj@...nel.org,
        lizefan.x@...edance.com, hannes@...xchg.org, corbet@....net
Cc:     cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: RT bandwidth interface for cgroup unified
 hierarchy

Hi--

On 6/21/22 05:35, Chengming Zhou wrote:
> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
> index 176298f2f4de..3d2949e16e04 100644
> --- a/Documentation/admin-guide/cgroup-v2.rst
> +++ b/Documentation/admin-guide/cgroup-v2.rst
> @@ -1055,6 +1055,19 @@ All time durations are in microseconds.
>  
>  	The burst in the range [0, $MAX].
>  
> +  cpu.max.rt
> +	A read-write two value file which exists on all cgroups when

	             two-value

> +	CONFIG_RT_GROUP_SCHED enabled, to control CPU bandwidth for

	                      is enabled,

> +	RT threads in the task group.
> +
> +	The maximum bandwidth limit.  It's in the following format::
> +
> +	  $MAX $PERIOD
> +
> +	which indicates that RT threads in the group may consume upto

	                                                         up to

> +	$MAX in each $PERIOD duration.  "max" for $MAX indicates no
> +	limit.  If only one number is written, $MAX is updated.

-- 
~Randy