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

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Message-ID: <Z3YRggwxMQTxfQ4k@casper.infradead.org>
Date: Thu, 2 Jan 2025 04:09:38 +0000
From: Matthew Wilcox <willy@...radead.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

On Wed, Jan 01, 2025 at 02:20:39PM -0800, SeongJae Park 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)

I'm not sure how DAMON can help with this one.  As I understand DAMON,
it monitors accesses to user addresses.  This patchset is trying to solve
the problem for file pages which aren't mapped to userspace at all.
ie only accessed through read() and write().