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

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Message-ID: <Zpuo-BWxvdbun5z7@kernel.org>
Date: Sat, 20 Jul 2024 15:09:28 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Zi Yan <ziy@...dia.com>
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>,
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Subject: Re: [PATCH 14/17] mm: introduce numa_emulation

On Fri, Jul 19, 2024 at 12:03:11PM -0400, Zi Yan wrote:
> 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.

I'll add this as a separate commit.
 
> 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



-- 
Sincerely yours,
Mike.