linux-kernel - [PATCH v5 05/10] mm,memory-tiers: Use node-notifier instead of memory-notifier

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Message-ID: <20250605142305.244465-6-osalvador@suse.de>
Date: Thu,  5 Jun 2025 16:22:56 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Harry Yoo <harry.yoo@...cle.com>,
	Rakie Kim <rakie.kim@...com>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v5 05/10] mm,memory-tiers: Use node-notifier instead of memory-notifier

memory-tier is only concerned when a numa node changes its memory state,
because it then needs to re-create the demotion list.
So stop using the memory notifier and use the new numa node notifer
instead.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/memory-tiers.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index fc14fe53e9b7..67f06e6264a1 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -872,25 +872,25 @@ static int __meminit memtier_hotplug_callback(struct notifier_block *self,
 					      unsigned long action, void *_arg)
 {
 	struct memory_tier *memtier;
-	struct memory_notify *arg = _arg;
+	struct node_notify *narg = _arg;
 
 	/*
 	 * Only update the node migration order when a node is
 	 * changing status, like online->offline.
 	 */
-	if (arg->status_change_nid < 0)
+	if (narg->nid < 0)
 		return notifier_from_errno(0);
 
 	switch (action) {
-	case MEM_OFFLINE:
+	case NODE_REMOVED_LAST_MEMORY:
 		mutex_lock(&memory_tier_lock);
-		if (clear_node_memory_tier(arg->status_change_nid))
+		if (clear_node_memory_tier(narg->nid))
 			establish_demotion_targets();
 		mutex_unlock(&memory_tier_lock);
 		break;
-	case MEM_ONLINE:
+	case NODE_ADDED_FIRST_MEMORY:
 		mutex_lock(&memory_tier_lock);
-		memtier = set_node_memory_tier(arg->status_change_nid);
+		memtier = set_node_memory_tier(narg->nid);
 		if (!IS_ERR(memtier))
 			establish_demotion_targets();
 		mutex_unlock(&memory_tier_lock);
@@ -929,7 +929,7 @@ static int __init memory_tier_init(void)
 	nodes_and(default_dram_nodes, node_states[N_MEMORY],
 		  node_states[N_CPU]);
 
-	hotplug_memory_notifier(memtier_hotplug_callback, MEMTIER_HOTPLUG_PRI);
+	hotplug_node_notifier(memtier_hotplug_callback, MEMTIER_HOTPLUG_PRI);
 	return 0;
 }
 subsys_initcall(memory_tier_init);
-- 
2.49.0