linux-kernel - Re: [PATCH v3 3/3] mm/vmscan: don't demote if there is not enough free memory in the lower memory tier

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Message-ID: <aWEn2ODG0gyej0Xr@gourry-fedora-PF4VCD3F>
Date: Fri, 9 Jan 2026 11:07:52 -0500
From: Gregory Price <gourry@...rry.net>
To: Akinobu Mita <akinobu.mita@...il.com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, akpm@...ux-foundation.org,
	axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
	hannes@...xchg.org, david@...nel.org, mhocko@...nel.org,
	zhengqi.arch@...edance.com, shakeel.butt@...ux.dev,
	lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, vbabka@...e.cz,
	rppt@...nel.org, surenb@...gle.com, bingjiao@...gle.com
Subject: Re: [PATCH v3 3/3] mm/vmscan: don't demote if there is not enough
 free memory in the lower memory tier

> +	for_each_node_mask(nid, allowed_mask) {
> +		int z;
> +		struct zone *zone;
> +		struct pglist_data *pgdat = NODE_DATA(nid);
> +
> +		for_each_managed_zone_pgdat(zone, pgdat, z, MAX_NR_ZONES - 1) {
> +			if (zone_watermark_ok(zone, 0, min_wmark_pages(zone),
> +						ZONE_MOVABLE, 0))

Why does this only check zone movable?  

Also, would this also limit pressure-signal to invoke reclaim when
there is still swap space available?  Should demotion not be a pressure
source for triggering harder reclaim?

~Gregory