Commit cf0b61ad authored by Oscar Salvador's avatar Oscar Salvador Committed by Andrew Morton
Browse files

mm,mempolicy: use node-notifier instead of memory-notifier 

mempolicy is only concerned when a numa node changes its memory state,
because it needs to take this node into account for the auto-weighted
memory policy system.  So stop using the memory notifier and use the new
numa node notifer instead.

Link: https://lkml.kernel.org/r/20250616135158.450136-10-osalvador@suse.de


Signed-off-by: default avatarOscar Salvador <osalvador@suse.de>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarHarry Yoo <harry.yoo@oracle.com>
Reviewed-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarRakie Kim <rakie.kim@sk.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarGregory Price <gourry@gourry.net>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 8e1bf051

mm/mempolicy.c

+5 −8
Original line number Diff line number Diff line
@@ -3788,20 +3788,17 @@ static int wi_node_notifier(struct notifier_block *nb, 
			       unsigned long action, void *data)

{

	int err;

	struct memory_notify *arg = data;

	int nid = arg->status_change_nid;



	if (nid < 0)

		return NOTIFY_OK;

	struct node_notify *nn = data;

	int nid = nn->nid;



	switch (action) {

	case MEM_ONLINE:

	case NODE_ADDED_FIRST_MEMORY:

		err = sysfs_wi_node_add(nid);

		if (err)

			pr_err("failed to add sysfs for node%d during hotplug: %d\n",

			       nid, err);

		break;

	case MEM_OFFLINE:

	case NODE_REMOVED_LAST_MEMORY:

		sysfs_wi_node_delete(nid);

		break;

	}
@@ -3840,7 +3837,7 @@ static int __init add_weighted_interleave_group(struct kobject *mempolicy_kobj) 
		}

	}



	hotplug_memory_notifier(wi_node_notifier, DEFAULT_CALLBACK_PRI);

	hotplug_node_notifier(wi_node_notifier, DEFAULT_CALLBACK_PRI);

	return 0;



err_cleanup_kobj: