Re: Is it possible to load Linux kernel code to a specific NUMA node when booting?

[Randy Goldenberg]

Would numa=off meet your needs?

https://www.kernel.org/doc/Documentation/x86/x86_64/boot-options.txt

On Thu, May 30, 2024 at 6:26 AM <chang-liu22@mails.tsinghua.edu.cn> wrote:

> Hi all,
>
> I'm doing a benchmark in Linux kernel. I want to make sure all the
> benchmarked kernel code is stored in the same NUMA node as the CPU that
> runs the code. I implement a system call to trigger the execution of the
> benchmarked kernel code, so I can specify the CPU to run the benchmarked
> code by binding CPU in userspace. However, I cannot guarantee the kernel
> code is stored in the same NUMA node as the CPU that runs the benchmark. My
> benchmark server has two NUMA nodes, and runs Ubuntu 22.04 with the default
> GRUB boot loader. After rebooting the server several times, I found
> sometimes the kernel code is loaded into NUMA node 0, and sometimes it is
> loaded into NUMA node 1.
>
> I wonder is there any way that I can force Linux kernel code to be loaded
> in a specific NUMA node during the booting process. I think GRUB is
> responsible for loading the Linux kernel into memory, so posting my
> question here might help. However, please correct me if I am wrong. I'd be
> very grateful if anyone can help :)
>
> Chang Liu