linux-kernel - Re: [PATCH v4] Weighted Interleave Auto-tuning

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Message-ID: <Z55RpQgsma5wrpfh@gourry-fedora-PF4VCD3F>
Date: Sat, 1 Feb 2025 11:53:57 -0500
From: Gregory Price <gourry@...rry.net>
To: Honggyu Kim <honggyu.km@...il.com>
Cc: Joshua Hahn <joshua.hahnjy@...il.com>, ying.huang@...ux.alibaba.com,
	rafael@...nel.org, lenb@...nel.org, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org, honggyu.kim@...com, rakie.kim@...com,
	dan.j.williams@...el.com, Jonathan.Cameron@...wei.com,
	dave.jiang@...el.com, horen.chuang@...ux.dev, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-mm@...ck.org, kernel-team@...a.com, kernel_team@...ynix.com,
	42.hyeyoo@...il.com
Subject: Re: [PATCH v4] Weighted Interleave Auto-tuning

On Sat, Feb 01, 2025 at 11:49:31AM -0500, Gregory Price wrote:
> >   1. the auto mode set the weights as 10:5:1 for node{0-2}.
> >   2. node2 is offlined, then recalculation makes it as 2:1 for node{0,1}.

Point of clarification here:  a hot-unplug event won't cause
recalculation.

What actually causes re-weight is hot-plug reporting new capacity.

So in this scenario, the weight will remain the same for node2.

> >   3. the auto sysfs interface is set to 0 to make it manual mode.