Re: [FYI] DAMON and virtio-balloon in DeepSeek's DSec paper

[SJ Park <sj@kernel.org>]

On Tue, 29 Sep 2026 20:32:41 +0800 Jialiang Huang <huang-jl@deepseek.com> wrote:

> Hi all,
> 
> I'm an engineer at DeepSeek. Thanks for the discussion, and thanks
> to everyone working on DAMON and virtio-balloon free-page reporting.
> They have been very useful for our workloads.

So glad to hear this.  And thank you for sharing your use case!

[...]
> We have not yet fully explored how best to tune the DAMON and free-page
> reporting parameters for our workloads. For example, the kernel's default
> free-page reporting granularity is 2 MiB, which is fairly coarse:
> reclaiming cold pages does not necessarily produce free blocks of that
> size. We still need to evaluate how finer reporting granularity and
> different DAMON settings affect memory savings and workload performance.

I agree the reclaim-reporting granularity mismatch could be a room to improve.
As I also mentioned on my previous reply, this was one of the main motivations
of Access/Contiguity-aware Memory Autoscaling [1] proposal.  As also mentioned
on the previous reply, the project made no much progress yet, though.

[1] https://lore.kernel.org/all/20240512193657.79298-1-sj@kernel.org/


Thanks,
SJ

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