linux-kernel - Re: [RFC PATCH] mm: migrate: Add new node demotion strategy

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Date:   Thu, 4 Nov 2021 08:18:02 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>,
        akpm@...ux-foundation.org
Cc:     ying.huang@...el.com, dave.hansen@...ux.intel.com, ziy@...dia.com,
        osalvador@...e.de, shy828301@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mm: migrate: Add new node demotion strategy

On 11/4/21 2:13 AM, Baolin Wang wrote:
> +What:		/sys/kernel/mm/numa/demotion_mode
> +Date:		November 2021
> +Contact:	Linux memory management mailing list <linux-mm@...ck.org>
> +Description:	Set the demotion mode when enabling demoting pages during reclaim

I don't think we need a tunable for this.  The existing behavior is just
stupid for your hardware and can be replaced.  Let's also try to do it
with the existing node_demotion[] data structure before we go adding more.