linux-kernel - Re: [PATCH v2 6/7] x86/resctrl: Update documentation with Sub-NUMA cluster changes

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Date:   Wed, 21 Jun 2023 10:52:07 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
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>,
        James Morse <james.morse@....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 v2 6/7] x86/resctrl: Update documentation with Sub-NUMA
 cluster changes

Hi Tony,

On 6/21/23 10:40, Tony Luck wrote:
> With Sub-NUMA Cluster mode enabled the scope of monitoring resources is
> per-NODE instead of per-L3 cache. Suffixes of directories with "L3" in
> their name refer to Sub-NUMA nodes instead of L3 cache ids.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  Documentation/arch/x86/resctrl.rst | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
> index cb05d90111b4..13fc9fa664fc 100644
> --- a/Documentation/arch/x86/resctrl.rst
> +++ b/Documentation/arch/x86/resctrl.rst
> @@ -345,9 +345,13 @@ When control is enabled all CTRL_MON groups will also contain:
>  When monitoring is enabled all MON groups will also contain:
>  
>  "mon_data":
> -	This contains a set of files organized by L3 domain and by
> -	RDT event. E.g. on a system with two L3 domains there will
> -	be subdirectories "mon_L3_00" and "mon_L3_01".	Each of these
> +	This contains a set of files organized by L3 domain or by NUMA
> +	node (depending on whether Sub-NUMA Cluster (SNC) mode is disabled
> +	or enabled respectively) and by RDT event. E.g. on a system with
> +	SNC mode disabled with two L3 domains there will be subdirectories
> +	"mon_L3_00" and "mon_L3_01" the numerical suffix refers to the

	                "mon_L3_01". The
or just insert a semi-colon. Anything to break up the run-on sentence.

> +	L3 cache id.  With SNC enabled the directory names are the same,
> +	but the numerical suffix refers to the node id.  Each of these
>  	directories have one file per event (e.g. "llc_occupancy",

	            has

>  	"mbm_total_bytes", and "mbm_local_bytes"). In a MON group these
>  	files provide a read out of the current value of the event for

-- 
~Randy