RE: [LSF/MM/BPF TOPIC] DAMON Updates and Future Plans

"Pulavarty, Badari" <badari.pulavarty@xxxxxxxxx> · Wed, 1 Mar 2023 00:24:54 +0000

Hi SJ,

We discussed this earlier. 

- Are there plans to make DAMON monitor/manage cgroup instead of individual pids? 

Thanks,
Badari

-----Original Message-----
From: SeongJae Park <sj@xxxxxxxxxx> 
Sent: Monday, February 13, 2023 4:33 PM
To: lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: SeongJae Park <sj@xxxxxxxxxx>; damon@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
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