linux-kernel - Re: [PATCH 6/7] x86/resctrl: Update documentation with Sub-NUMA cluster changes

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Date:   Tue, 28 Feb 2023 17:14:34 +0000
From:   James Morse <james.morse@....com>
To:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>, x86@...nel.org
Cc:     Shaopeng Tan <tan.shaopeng@...itsu.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH 6/7] x86/resctrl: Update documentation with Sub-NUMA
 cluster changes

Hi Tony,

On 26/01/2023 18:41, Tony Luck wrote:
> With Sub-NUMA Cluster mode enabled the scope of monitoring resources is
> per-NODE instead of per-L3 cache. Suffices of directories with "L3" in

(Typo: Suffixes)

> their name refer to Sun-NUMA nodes instead of L3 cache ids.

(Typo: Sub-NUMA)


> diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
> index 71a531061e4e..9043a2d2f2d3 100644
> --- a/Documentation/x86/resctrl.rst
> +++ b/Documentation/x86/resctrl.rst
> @@ -167,6 +167,11 @@ with the following files:
>  		bytes) at which a previously used LLC_occupancy
>  		counter can be considered for re-use.
>  
> +"snc_ways":
> +                A value of "1" marks that SNC mode is disabled.

It would be good to expand the acronym the first time its used in the documentation.
This gives folk a few more characters to google!


> +                Values of "2" or "4" indicate how many NUMA
> +                nodes share an L3 cache.
> +
>  Finally, in the top level of the "info" directory there is a file
>  named "last_cmd_status". This is reset with every "command" issued
>  via the file system (making new directories or writing to any of the



Thanks,

James