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

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Message-ID: <Z3avJl1AJYG96RAA@gourry-fedora-PF4VCD3F>
Date: Thu, 2 Jan 2025 10:22:14 -0500
From: Gregory Price <gourry@...rry.net>
To: Matthew Wilcox <willy@...radead.org>
Cc: SeongJae Park <sj@...nel.org>, 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>,
	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 Thu, Jan 02, 2025 at 04:09:38AM +0000, Matthew Wilcox wrote:
> 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().

DAMON can monitor physical addresses to, though the mechanism is
different.  I haven't assessed this as a solution, yet.

~Gregory