linux-kernel - [LSF/MM/BPF TOPIC] DAMON Updates and Future Plans

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Date:   Tue, 14 Feb 2023 00:33:28 +0000
From:   SeongJae Park <sj@...nel.org>
To:     lsf-pc@...ts.linux-foundation.org
Cc:     SeongJae Park <sj@...nel.org>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [LSF/MM/BPF TOPIC] DAMON Updates and Future Plans

Hi all,

DAMON has merged into mainline as a data access monitoring tool that equips a
best-effort overhead-accuracy tradeoff mechanism, and then extended for data
access-aware system operations.  I'd like to briefly introduce current state of
DAMON and share/discuss about 2023 plans including below.

- Finer and easier-to-use DAMOS tuning
  - tuning aggressiveness based on user or kernel feed (e.g., QPS or PSI)
- Merging DAMON user space tool into the mainline
- Extending DAMON
  - Page-granularity monitoring
    - LRU-lists based page-granulariy monitoring
  - CPU-specific access monitoring
  - Read/Write-only access monitoring
- More DAMON-based Operation Schemes
  - Tiered memory management
  - THP memory footprint reduction
  - NUMA balancing

I hope to hear concerns/interests about the plans for prioritizing each work
items and get some suggestions of future works and collaboration with other
kernel subsystems/hackers.

Thanks,
SJ