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

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Message-ID: <20250325210114.844509-1-sj@kernel.org>
Date: Tue, 25 Mar 2025 14:01:13 -0700
From: SeongJae Park <sj@...nel.org>
To: SeongJae Park <sj@...nel.org>
Cc: lsf-pc@...ts.linux-foundation.org,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	Raghavendra K T <raghavendra.kt@....com>,
	Yuanchu Xie <yuanchu@...gle.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Gregory Price <gourry@...rry.net>,
	Kaiyang Zhao <kaiyang2@...cmu.edu>,
	Jiaming Yan <jiamingy@...zon.com>,
	Honggyu Kim <honggyu.kim@...com>
Subject: Re: [LSF/MM/BPF TOPIC] DAMON Requirements for Access-aware MM of Future

Hello,

On Wed,  1 Jan 2025 14:20:39 -0800 SeongJae Park <sj@...nel.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

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