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

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Date: Mon, 13 May 2024 20:59:15 +0900
From: Honggyu Kim <honggyu.kim@...com>
To: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org,
	Honggyu Kim <honggyu.kim@...com>,
	Hyeongtak Ji <hyeongtak.ji@...com>,
	Rakie Kim <rakie.kim@...com>,
	kernel_team@...ynix.com
Subject: Re: [RFC PATCH v4 0/5] DAMON based tiered memory management for CXL memory

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

On Sun, 12 May 2024 10:54:42 -0700 SeongJae Park <sj@...nel.org> 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.
> 
> Changes from RFC v3
> (https://lore.kernel.org/20240405060858.2818-1-honggyu.kim@sk.com):

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

>   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.

>   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.  Sorry, I will have another break
this week.

Thanks,
Honggyu