linux-kernel - Re: [RFC PATCH v2 0/7] DAMON based 2-tier memory management for CXL memory

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Date: Wed,  6 Mar 2024 19:05:50 -0800
From: SeongJae Park <sj@...nel.org>
To: SeongJae Park <sj@...nel.org>
Cc: Honggyu Kim <honggyu.kim@...com>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	akpm@...ux-foundation.org,
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Subject: Re: [RFC PATCH v2 0/7] DAMON based 2-tier memory management for CXL memory

Hello,

On Tue, 27 Feb 2024 15:51:20 -0800 SeongJae Park <sj@...nel.org> wrote:

> On Mon, 26 Feb 2024 23:05:46 +0900 Honggyu Kim <honggyu.kim@...com> wrote:
> 
> > There was an RFC IDEA "DAMOS-based Tiered-Memory Management" previously
> > posted at [1].
> > 
> > It says there is no implementation of the demote/promote DAMOS action
> > are made.  This RFC is about its implementation for physical address
> > space.
[...]
> Honggyu joined DAMON Beer/Coffee/Tea Chat[1] yesterday, and we discussed about
> this patchset in high level.  Sharing the summary here for open discussion.  As
> also discussed on the first version of this patchset[2], we want to make single
> action for general page migration with minimum changes, but would like to keep
> page level access re-check.  We also agreed the previously proposed DAMOS
> filter-based approach could make sense for the purpose.
> 
> Because I was anyway planning making such DAMOS filter for not only
> promotion/demotion but other types of DAMOS action, I will start developing the
> page level access re-check results based DAMOS filter.  Once the implementation
> of the prototype is done, I will share the early implementation.  Then, Honggyu
> will adjust their implementation based on the filter, and run their tests again
> and share the results.

I just posted an RFC patchset for the page level access re-check DAMOS filter:
https://lore.kernel.org/r/20240307030013.47041-1-sj@kernel.org

I hope it to help you better understanding and testing the idea.

> 
> [1] https://lore.kernel.org/damon/20220810225102.124459-1-sj@kernel.org/
> [2] https://lore.kernel.org/damon/20240118171756.80356-1-sj@kernel.org


Thanks,
SJ

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