Re: [LSF/MM/BPF TOPIC] DAMON Requirements for Access-aware MM of Future

SeongJae Park
2025-03-25T21:01:17Z

Hello,

On Wed, 1 Jan 2025 14:20:39 -0800 SeongJae Park <sj@kernel.org> wrote:

> Hi all,
>
>
> I find a few interesting and promising projects that aim to do efficient access
> pattern-aware memory management of near future, including below (alphabetically
> sorted).
>
> - CXL hotness monitoring unit
> (https://lore.kernel.org/20241121101845.1815660-1-Jonathan.Cameron@huawei.com)
> - Memory tiering fainess by per-cgroup control of promotion and demotion
> (https://lore.kernel.org/20241108190152.3587484-1-kaiyang2@cs.cmu.edu)
> - Promotion of unmapped page cache folios
> (https://lore.kernel.org/20241210213744.2968-1-gourry@gourry.net)
> - Slow-tier page promotion based on PTE A bit
> (https://lore.kernel.org/20241201153818.2633616-1-raghavendra.kt@amd.com)
> - Workingset reporting
> (https://lore.kernel.org/20241127025728.3689245-1-yuanchu@google.com)
>
> The goal of DAMON is to help accelerating such developments by being a
> framework that can reduce fundamental efforts for monitoring memory access
> patterns and managing memory using the information. AWS Aurora Serverless v2
> and SK hynix are successfully using DAMON in the way for proactive memory
> reclamation[1] and CXL memory tiering[2].
>
> To further deliver such benefits for the ongoing and future projects, we need
> to better understand what the projects really need, how DAMON can provide those
> now or in future, and if there are alternatives better than DAMON. Regardless
> of the conclusion about DAMON, the works apparently have common parts, so the
> discussion will benefit all.
>
> I propose to have the discussion at LSF/MM/BPF. In the session, I will briefly
> introduce the works and possible DAMON usages, and continue the open discussion
> for better understanding each other. The discussion will not be limited to
> DAMON and abovely mentioned projects but possible alternatives and general
> access-aware memory management projects. After the discussion, we will
> hopefully find ways to efficiently collaborate, or at least do not disturb each
> other.
>
> [1] https://assets.amazon.science/ee/a4/41ff11374f2f865e5e24de11bd17/resource-management-in-aurora-serverless.pdf
> [2] https://github.com/skhynix/hmsdk/wiki/Capacity-Expansion

A draft of the slides for this session is now available at
https://github.com/damonitor/talks/blob/master/2025/lsfmmbpf/damon_requirements_lsfmmbpf_2025.pdf

I may make more last time changes to the slides, but the final version should
also be available on the same URL.

Thanks,
SJ …