linux-kernel - Re: [PATCH 2/2 v6] mm/mempolicy: Don't create weight sysfs for memoryless nodes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z871k085e-Th-jTz@gourry-fedora-PF4VCD3F>
Date: Mon, 10 Mar 2025 10:22:11 -0400
From: Gregory Price <gourry@...rry.net>
To: Honggyu Kim <honggyu.kim@...com>
Cc: kernel_team@...ynix.com, Joshua Hahn <joshua.hahnjy@...il.com>,
	harry.yoo@...cle.com, ying.huang@...ux.alibaba.com,
	gregkh@...uxfoundation.org, rakie.kim@...com,
	akpm@...ux-foundation.org, rafael@...nel.org, lenb@...nel.org,
	dan.j.williams@...el.com, Jonathan.Cameron@...wei.com,
	dave.jiang@...el.com, horen.chuang@...ux.dev, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-mm@...ck.org, kernel-team@...a.com, yunjeong.mun@...com
Subject: Re: [PATCH 2/2 v6] mm/mempolicy: Don't create weight sysfs for
 memoryless nodes

On Mon, Mar 10, 2025 at 09:26:48PM +0900, Honggyu Kim wrote:
> Yeah, the proximity domain detects the node correctly as follows in dmesg.
> 
>  [  0.009915] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x7fffffff]
>  [  0.009917] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x207fffffff]
>  [  0.009919] ACPI: SRAT: Node 1 PXM 1 [mem 0x60f80000000-0x64f7fffffff]
>  [  0.009924] ACPI: SRAT: Node 2 PXM 6 [mem 0x2080000000-0x807fffffff] hotplug
>  [  0.009925] ACPI: SRAT: Node 3 PXM 7 [mem 0x64f80000000-0x6cf7fffffff] hotplug
> 
> It is printed even before CXL detection.
> 

I wrote a some documentation on some example configurations last friday

https://lore.kernel.org/linux-mm/Z226PG9t-Ih7fJDL@gourry-fedora-PF4VCD3F/T/#m2780e47df7f0962a79182502afc99843bb046205

This isn't exhaustive, but as I said with Rakie, I think your
configuration is probably ok - if slightly confusing.

What I'm going to guess is happening is you have 1 CFMWS per device that
do not have matching SRAT entries, and then the CFMWS covering these:

>  [  0.009924] ACPI: SRAT: Node 2 PXM 6 [mem 0x2080000000-0x807fffffff] hotplug
>  [  0.009925] ACPI: SRAT: Node 3 PXM 7 [mem 0x64f80000000-0x6cf7fffffff] hotplug

have interleave set up