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

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Message-ID: <Z8-jLIugrb86KBSZ@gourry-fedora-PF4VCD3F>
Date: Mon, 10 Mar 2025 22:42:52 -0400
From: Gregory Price <gourry@...rry.net>
To: Yunjeong Mun <yunjeong.mun@...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,
	Honggyu Kim <honggyu.kim@...com>
Subject: Re: [PATCH 2/2 v6] mm/mempolicy: Don't create weight sysfs for
 memoryless nodes

On Tue, Mar 11, 2025 at 11:07:27AM +0900, Yunjeong Mun wrote:
> Hi Gregory,
> 
> In my understanding, both SRAT and CFMWS have the above device and interleave setup.
> 
> and below are the CFMWS configurations (with some unnecessary lines removed):
> 
> [0A4h 0164 001h]               Subtable Type : 01 [CXL Fixed Memory Window Structure]
> [0ACh 0172 008h]         Window base address : 0000002080000000 <- Memory region
> [0B4h 0180 008h]                 Window size : 0000032780000000
> [0BCh 0188 001h]          Interleave Members : 01           <-- 2-way interleave
> [0BDh 0189 001h]       Interleave Arithmetic : 01
> [0C8h 0200 004h]                First Target : 00000043     <-- host bridge id  
> [0CCh 0204 004h]                 Next Target : 00000053     <-- host bridge id 
> 
> ...
> 
> [170h 0368 001h]               Subtable Type : 01 [CXL Fixed Memory Window Structure]
> [178h 0376 008h]         Window base address : 0000064F80000000
> [180h 0384 008h]                 Window size : 0000033000000000
> [188h 0392 001h]          Interleave Members : 01          <-- 2-way interleave
> [189h 0393 001h]       Interleave Arithmetic : 01
> [194h 0404 004h]                First Target : 00000143    <-- host bridge id
> [198h 0408 004h]                 Next Target : 00000153    <-- host bridge id
>

Are you able to share all CXL Fixed Memory Window Structures in the
CEDT?  Just want to confirm some suspicions here about why we're seeing
12 NUMA nodes.  This explains 2 and suggests there's at least 4 host
bridges - but not the other 8.

~Gregory