Re: [LSF/MM/BPF TOPIC] Restricting or migrating unmovable kernel allocations from slow tier

Honggyu Kim
2025-02-07T09:34:51Z

Hi Gregory,

On 2/7/2025 5:57 PM, Gregory Price wrote:

[...snip...]

>> and kernel stack,
>
> The default kernel stack size is like 16kb. You'd need like 100,000
> threads to eat up 1.5GB, and 2048 threads only eats like 32MB.
>
> It's not an interesting amount of memory if you have a 20TB system.

The amount might be small, but having those data in slow tier can
make performance degradation if it is heavily accessed.

The number of accesses isn't linearly corelated to the size of the
memory region.

Thanks,
Honggyu