linux-kernel - Re: [PATCH 14/17] mm: introduce numa

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Message-ID: <CCB95DEB-6B72-4175-A379-7E60D89114A6@nvidia.com>
Date: Fri, 19 Jul 2024 12:03:11 -0400
From: Zi Yan <ziy@...dia.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-kernel@...r.kernel.org, Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andreas Larsson <andreas@...sler.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
 Borislav Petkov <bp@...en8.de>, Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Dan Williams <dan.j.williams@...el.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 David Hildenbrand <david@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Heiko Carstens <hca@...ux.ibm.com>, Huacai Chen <chenhuacai@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Jiaxun Yang <jiaxun.yang@...goat.com>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Michael Ellerman <mpe@...erman.id.au>, Palmer Dabbelt <palmer@...belt.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Thomas Gleixner <tglx@...utronix.de>, Vasily Gorbik <gor@...ux.ibm.com>,
 Will Deacon <will@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
 sparclinux@...r.kernel.org, linux-acpi@...r.kernel.org,
 linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
 devicetree@...r.kernel.org, linux-arch@...r.kernel.org, linux-mm@...ck.org,
 x86@...nel.org
Subject: Re: [PATCH 14/17] mm: introduce numa_emulation

On 16 Jul 2024, at 7:13, Mike Rapoport wrote:

> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
>
> Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c
>
> This code will be later reused by arch_numa.
>
> No functional changes.
>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> ---
>  arch/x86/Kconfig             |  8 --------
>  arch/x86/include/asm/numa.h  | 12 ------------
>  arch/x86/mm/Makefile         |  1 -
>  arch/x86/mm/numa_internal.h  | 11 -----------
>  include/linux/numa_memblks.h | 17 +++++++++++++++++
>  mm/Kconfig                   |  8 ++++++++
>  mm/Makefile                  |  1 +
>  mm/numa_emulation.c          |  4 +---
>  8 files changed, 27 insertions(+), 35 deletions(-)

After this code move, the document of numa=fake= should be moved from
Documentation/arch/x86/x86_64/boot-options.rst to
Documentation/admin-guide/kernel-parameters.txt
too.

Something like:

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index bc55fb55cd26..ce3659289b5e 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4158,6 +4158,18 @@
                        Disable NUMA, Only set up a single NUMA node
                        spanning all memory.

+       numa=fake=<size>[MG]
+                       If given as a memory unit, fills all system RAM with nodes of
+                       size interleaved over physical nodes.
+
+       numa=fake=<N>
+                       If given as an integer, fills all system RAM with N fake nodes
+                       interleaved over physical nodes.
+
+       numa=fake=<N>U
+                       If given as an integer followed by 'U', it will divide each
+                       physical node into N emulated nodes.
+
        numa_balancing= [KNL,ARM64,PPC,RISCV,S390,X86] Enable or disable automatic
                        NUMA balancing.
                        Allowed values are enable and disable
diff --git a/Documentation/arch/x86/x86_64/boot-options.rst b/Documentation/arch/x86/x86_64/boot-options.rst
index 137432d34109..98d4805f0823 100644
--- a/Documentation/arch/x86/x86_64/boot-options.rst
+++ b/Documentation/arch/x86/x86_64/boot-options.rst
@@ -170,18 +170,6 @@ NUMA
     Don't parse the HMAT table for NUMA setup, or soft-reserved memory
     partitioning.

-  numa=fake=<size>[MG]
-    If given as a memory unit, fills all system RAM with nodes of
-    size interleaved over physical nodes.
-
-  numa=fake=<N>
-    If given as an integer, fills all system RAM with N fake nodes
-    interleaved over physical nodes.
-
-  numa=fake=<N>U
-    If given as an integer followed by 'U', it will divide each
-    physical node into N emulated nodes.
-
 ACPI
 ====

Best Regards,
Yan, Zi

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