linux-kernel - Re: [PATCH] EDAC: Expose node link in sysfs if CONFIG

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Date:   Tue, 16 May 2023 11:59:07 +0000
From:   "Yajun Deng" <yajun.deng@...ux.dev>
To:     "Borislav Petkov" <bp@...en8.de>
Cc:     tony.luck@...el.com, james.morse@....com, mchehab@...nel.org,
        rric@...nel.org, corbet@....net, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] EDAC: Expose node link in sysfs if CONFIG_NUMA

May 16, 2023 7:19 PM, "Borislav Petkov" <bp@...en8.de> wrote:

> On Tue, May 16, 2023 at 11:07:11AM +0000, Yajun Deng wrote:
> 
>> It will help users to confirm which MC belongs to which node if there
>> are multiple MCs. Therefore, we can also know how many dimm on each
>> node.
> 
> There are physical nodes, logical nodes, NUMA nodes, interleaving
> between nodes...
> 

Node is the NUMA node, We get the numa id by calling dev_to_node().

> Is there any practical use case and need behind this?
>

Some dimm may not be recognized when boot, we want to find it.

The '/sys/devices/system/node/node0/meminfo' would show the memory on
node0.

If we have '/sys/devices/system/node/node0/mc0', by comparing the number
of dimm and MemTotal in meminfo. It is easy to know that the dimm didn't 
recognized whether it belonged to this NUMA node or not.

> --
> Regards/Gruss,
> Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette