linux-kernel - Re: [LSF/MM/BPF TOPIC] Weighted interleave auto-tuning

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Message-ID: <Z-Uye2V-6Urz2IIA@localhost.localdomain>
Date: Thu, 27 Mar 2025 12:11:55 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Joshua Hahn <joshua.hahnjy@...il.com>
Cc: lsf-pc@...ts.linux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, gourry@...rry.net,
	ying.huang@...ux.alibaba.com, hyeonggon.yoo@...com,
	honggyu.kim@...com, kernel-team@...a.com
Subject: Re: [LSF/MM/BPF TOPIC] Weighted interleave auto-tuning

On Thu, Jan 09, 2025 at 01:50:48PM -0500, Joshua Hahn wrote:
> Hello everyone, I hope everyone has had a great start to 2025!

Hi Joshua,

as discussed in the LSFMM about how you can react to nodes becoming
memory{aware,less}, you can register a hotplug memory notifier, as
memory-tiering currently does.

The current use of the hotplug memory notifier by some consumers (e.g:
memory-tiering, slub, etc) is a bit suboptimal, as they only care about
nodes changing its memory state, yet they get notified for every
{online,offline}_pages operation.

I came up with [1]

I did not publish it yet upstream because I wanted to discuss it a bit
with David, but you can give it a try to see if it works for you.
But till it is upstream, you will have to use the hotplug memory
notifier.

[1] https://github.com/leberus/linux.git numa-node-notifier 

-- 
Oscar Salvador
SUSE Labs