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

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Date: Fri,  8 Mar 2024 17:31:25 +0900
From: Honggyu Kim <honggyu.kim@...com>
To: SeongJae Park <sj@...nel.org>
Cc: Honggyu Kim <honggyu.kim@...com>,
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Subject: Re: Re: [RFC PATCH v2 0/7] DAMON based 2-tier memory management for CXL memory

Hi SeongJae,

I couldn't send email to LKML properly due to internal system issues,
but it's better now so I will be able to communicate better.

On Wed,  6 Mar 2024 19:05:50 -0800 SeongJae Park <sj@...nel.org> wrote:
> 
> 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.

Thanks very much for your work! I will test it based on your changes.

Thanks,
Honggyu

> 
> > 
> > [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
> 
> [...]
> 
> 
>