linux-kernel - Re: [RFC PATCH v1 0/3] Rebase DAMON

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Date:   Tue, 22 Feb 2022 09:53:02 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Jonghyeon Kim <tome01@...u.ac.kr>
Cc:     akpm@...ux-foundation.org, Jonathan.Cameron@...wei.com,
        amit@...nel.org, benh@...nel.crashing.org, corbet@....net,
        david@...hat.com, dwmw@...zon.com, elver@...gle.com,
        foersleo@...zon.de, gthelen@...gle.com, markubo@...zon.de,
        rientjes@...gle.com, shakeelb@...gle.com, shuah@...nel.org,
        linux-damon@...zon.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/3] Rebase DAMON_RECALIM for NUMA system

Hello Jonghyeon,

On Fri, 18 Feb 2022 19:26:08 +0900 Jonghyeon Kim <tome01@...u.ac.kr> wrote:

> 
> Current DAMON_RECALIM is not compatible with the NUMA memory system. To
> proactively reclaim memory, DAMON_RECLAIM kernel thread(kdamond) has to wake up
> before kswapd does reclaim memory. However, the current watermark for proactive
> reclamation is based on entire system free memory. So, though the one memory
> node is fully used, kdamond is not waked up.
> 
> These patches clarify watermarks of DAMOS and enable monitoring per NUMA node
> proactive reclamation on DAMON_RECLAIM.

The high level concept of this patchset looks good to me.  Nevertheless, maybe
there is some rooms for improvement.  I left some comments on patches.


Thanks,
SJ

> 
> Jonghyeon Kim (3):
>   mm/damon: Rebase damos watermarks for NUMA systems
>   mm/damon/core: Add damon_start_one()
>   mm/damon/reclaim: Add per NUMA node proactive reclamation by
>     DAMON_RECLAIM.
> 
>  include/linux/damon.h |   3 +
>  mm/damon/core.c       |  39 +++++++++--
>  mm/damon/reclaim.c    | 147 ++++++++++++++++++++++++++++++------------
>  3 files changed, 140 insertions(+), 49 deletions(-)
> 
> -- 
> 2.17.1