Re: [RFC PATCH v4 0/5] DAMON based tiered memory management for CXL memory

Hi Honggyu,

On Mon, 13 May 2024 20:59:15 +0900 Honggyu Kim [off-list ref] wrote:

Hi SeongJae,

Thanks very much for your work!  It got delayed due to the priority
changes in my workplace for building another heterogeneous memory
allocator.
https://github.com/skhynix/hmsdk/wiki/hmalloc

No problem at all.  We all work on our own schedule and nobody can chase/push
anybody :)

On Sun, 12 May 2024 10:54:42 -0700 SeongJae Park [off-list ref] wrote:

quoted

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.

Changes from RFC v3
(https://lore.kernel.org/20240405060858.2818-1-honggyu.kim@sk.com (local)):

This link cannot be opened.  I will share the link again here.
https://lore.kernel.org/all/20240405060858.2818-1-honggyu.kim@sk.com (local)

Thank you for checking the link!  It's weird though, since I can open the link
on my Chrome browser.

quoted

  0. updated from v3 and posted by SJ on behalf of Hunggyu under his
     approval.
  1. Do not reuse damon_pa_pageout() and drop 'enum migration_mode'
  2. Drop vmstat change

I haven't checked whether I can collect useful information without
vmstat, but the changes look good in general except for that.

I was thinking you could use DAMOS stat[1] for the schemes and assuming no
reply to it as an agreement, but maybe I should made it clear.  Do you think
DAMOS stat cannot be used instead?  If so, what would be the limitation of
DAMOS stat for your usage?

quoted

  3. Drop unnecessary page reference check

I will compare this patch series with my previous v3 patchset and get
back to you later maybe next week.

Thank you very much!  Unless I get a good enough test setup and results from it
on my own or from others' help, your test result would be the last requirement
for dropping RFC from this patchset.

Sorry, I will have another break this week.

No problem, I hope you to have nice break.  Nobody can chase/push others.  We
all do this work voluntarily for our own fun and profit, right? ;)


[1] https://lore.kernel.org/damon/20240405060858.2818-1-honggyu.kim@sk.com (local)


Thanks,
SJ

Thanks,
Honggyu