linux-kernel - Re: [PATCH -next] mm: introduce per-node proactive reclaim interface

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Message-Id: <20240905215945.1909-1-hdanton@sina.com>
Date: Fri,  6 Sep 2024 05:59:45 +0800
From: Hillf Danton <hdanton@...a.com>
To: Davidlohr Bueso <dave@...olabs.net>
Cc: yosryahmed@...gle.com,
	mhocko@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] mm: introduce per-node proactive reclaim interface

On Wed,  4 Sep 2024 09:27:40 -0700 Davidlohr Bueso <dave@...olabs.net> wrote:

> This adds support for allowing proactive reclaim in general on a
> NUMA system. A per-node interface extends support for beyond a
> memcg-specific interface, respecting the current semantics of
> memory.reclaim: respecting aging LRU and not supporting
> artificially triggering eviction on nodes belonging to non-bottom
> tiers.
> 
> This patch allows userspace to do:
> 
>      echo 512M swappiness=10 > /sys/devices/system/node/nodeX/reclaim
>
The proactive reclaim on the cmdline looks like waste of cpu cycles before
the cases where kswapd fails to work are spotted. It is not correct to add
it because you can type the code.