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

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Date: Tue, 26 Mar 2024 16:03:09 -0700
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,
	apopple@...dia.com,
	baolin.wang@...ux.alibaba.com,
	dave.jiang@...el.com,
	hyeongtak.ji@...com,
	kernel_team@...ynix.com,
	linmiaohe@...wei.com,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	mathieu.desnoyers@...icios.com,
	mhiramat@...nel.org,
	rakie.kim@...com,
	rostedt@...dmis.org,
	surenb@...gle.com,
	yangx.jy@...itsu.com,
	ying.huang@...el.com,
	ziy@...dia.com,
	42.hyeyoo@...il.com
Subject: Re: [RFC PATCH v2 0/7] DAMON based 2-tier memory management for CXL memory

On Mon, 25 Mar 2024 15:53:03 -0700 SeongJae Park <sj@...nel.org> wrote:

> On Mon, 25 Mar 2024 21:01:04 +0900 Honggyu Kim <honggyu.kim@...com> wrote:
[...]
> > On Fri, 22 Mar 2024 09:32:23 -0700 SeongJae Park <sj@...nel.org> wrote:
> > > On Fri, 22 Mar 2024 18:02:23 +0900 Honggyu Kim <honggyu.kim@...com> wrote:
[...]
> >
> > I would like to hear how you think about this.
> 
> So, to summarize my humble opinion,
> 
> 1. I like the idea of having two actions.  But I'd like to use names other than
>    'promote' and 'demote'.
> 2. I still prefer having a filter for the page granularity access re-check.
> 
[...]
> > I will join the DAMON Beer/Coffee/Tea Chat tomorrow as scheduled so I
> > can talk more about this issue.
> 
> Looking forward to chatting with you :)

We met and discussed about this topic in the chat series yesterday.  Sharing
the summary for keeping the open discussion.

Honggyu thankfully accepted my humble suggestions on the last reply.  Honggyu
will post the third version of this patchset soon.  The patchset will implement
two new DAMOS actions, namely MIGRATE_HOT and MIGRATE_COLD.  Those will migrate
the DAMOS target regions to a user-specified NUMA node, but will have different
prioritization score function.  As name implies, they will prioritize more hot
regions and cold regions, respectively.

Honggyu, please feel free to fix if there is anything wrong or missed.

And thanks to Honggyu again for patiently keeping this productive discussion
and their awesome work.

Thanks,
SJ

[...]