linux-kernel - Re: [PATCH v1 0/2] support NUMA emulation for genertic arch

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Message-ID: <ZdWUPlqsxC_y3YFM@kernel.org>
Date: Wed, 21 Feb 2024 08:12:14 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Rongwei Wang <rongwei.wang@...ux.alibaba.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, rafael@...nel.org,
	pierre.gondois@....com, mingo@...hat.com,
	dave.hansen@...ux.intel.com, luto@...nel.org,
	teng.ma@...ux.alibaba.com
Subject: Re: [PATCH v1 0/2] support NUMA emulation for genertic arch

On Tue, Feb 20, 2024 at 07:36:00PM +0800, Rongwei Wang wrote:
> A brief introduction
> ====================
> 
> The NUMA emulation can fake more node base on a single
> node system, e.g.

.. 
 
> Lastly, it seems not a good choice to realize x86 and other genertic
> archs separately. But it can indeed avoid some architecture related
> APIs adjustments and alleviate future maintenance.

Why is it a good choice? Copying 1k lines from x86 to a new place and
having to maintain two copies does not sound like a good choice to me.

> The previous RFC link see [1].
> 
> Any advice are welcome, Thanks!
> 
> Change log
> ==========
> 
> RFC v1 -> v1
> * add new CONFIG_NUMA_FAKE for genertic archs.
> * keep x86 implementation, realize numa emulation in driver/base/ for
>   genertic arch, e.g, arm64.
> 
> [1] RFC v1: https://patchwork.kernel.org/project/linux-arm-kernel/cover/20231012024842.99703-1-rongwei.wang@linux.alibaba.com/
> 
> Rongwei Wang (2):
>   arch_numa: remove __init for early_cpu_to_node
>   numa: introduce numa emulation for genertic arch
> 
>  drivers/base/Kconfig          |   9 +
>  drivers/base/Makefile         |   1 +
>  drivers/base/arch_numa.c      |  32 +-
>  drivers/base/numa_emulation.c | 909 ++++++++++++++++++++++++++++++++++
>  drivers/base/numa_emulation.h |  41 ++
>  include/asm-generic/numa.h    |   2 +-
>  6 files changed, 992 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/base/numa_emulation.c
>  create mode 100644 drivers/base/numa_emulation.h
> 
> -- 
> 2.32.0.3.gf3a3e56d6
> 
> 

-- 
Sincerely yours,
Mike.