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

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Date:   Wed, 1 Mar 2023 00:24:54 +0000
From:   "Pulavarty, Badari" <badari.pulavarty@...el.com>
To:     SeongJae Park <sj@...nel.org>,
        "lsf-pc@...ts.linux-foundation.org" 
        <lsf-pc@...ts.linux-foundation.org>
CC:     "damon@...ts.linux.dev" <damon@...ts.linux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [LSF/MM/BPF TOPIC] DAMON Updates and Future Plans

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@...nel.org> 
Sent: Monday, February 13, 2023 4:33 PM
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