linux-kernel - Re: [PATCH v5 3/3] Documentation/x86: Documentation for MON group move feature

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Message-ID: <f826dd28-0213-b7ea-494c-8c7a0ff348ce@amd.com>
Date:   Thu, 30 Mar 2023 12:33:25 -0500
From:   "Moger, Babu" <babu.moger@....com>
To:     Peter Newman <peternewman@...gle.com>, reinette.chatre@...el.com,
        fenghua.yu@...el.com
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, eranian@...gle.com,
        gupasani@...gle.com, hpa@...or.com, james.morse@....com,
        linux-kernel@...r.kernel.org, mingo@...hat.com, skodak@...gle.com,
        tglx@...utronix.de, tony.luck@...el.com, x86@...nel.org
Subject: Re: [PATCH v5 3/3] Documentation/x86: Documentation for MON group
 move feature

Hi Peter,

On 3/30/23 08:55, Peter Newman wrote:
> Describe new support for moving MON groups to a new parent CTRL_MON
> group and its restrictions.

Sorry for coming in late here. I am planning to test these patches. It
would be helpful to give a simple example to test this feature.
Thanks
Babu

> 
> Signed-off-by: Peter Newman <peternewman@...gle.com>
> ---
>  Documentation/x86/resctrl.rst | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
> index 387ccbcb558f..cb05d90111b4 100644
> --- a/Documentation/x86/resctrl.rst
> +++ b/Documentation/x86/resctrl.rst
> @@ -287,6 +287,13 @@ Removing a directory will move all tasks and cpus owned by the group it
>  represents to the parent. Removing one of the created CTRL_MON groups
>  will automatically remove all MON groups below it.
>  
> +Moving MON group directories to a new parent CTRL_MON group is supported
> +for the purpose of changing the resource allocations of a MON group
> +without impacting its monitoring data or assigned tasks. This operation
> +is not allowed for MON groups which monitor CPUs. No other move
> +operation is currently allowed other than simply renaming a CTRL_MON or
> +MON group.
> +
>  All groups contain the following files:
>  
>  "tasks":