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mm,memory_hotplug: implement numa node notifier

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There are at least six consumers of hotplug_memory_notifier that what they
really are interested in is whether any numa node changed its state, e.g:
going from having memory to not having memory and vice versa.

Implement a specific notifier for numa nodes when their state gets
changed, which will later be used by those consumers that are only
interested in numa node state changes.

Add documentation as well.

[dan.carpenter@linaro.org: set failure reason in offline_pages()]
  Link: https://lkml.kernel.org/r/be4fd31b-7d09-46b0-8329-6d0464ffa7a5@sabinyo.mountain
Link: https://lkml.kernel.org/r/20250616135158.450136-4-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Oscar Salvador
2025-06-16 15:51:46 +02:00
committed by Andrew Morton
parent 8d2882a8ed
commit 67929de108
4 changed files with 210 additions and 80 deletions
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21
drivers/base/node.c
View File

@@ -112,6 +112,27 @@ static const struct attribute_group *node_access_node_groups[] = {
NULL,
};
#ifdef CONFIG_MEMORY_HOTPLUG
static BLOCKING_NOTIFIER_HEAD(node_chain);
int register_node_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&node_chain, nb);
}
EXPORT_SYMBOL(register_node_notifier);
void unregister_node_notifier(struct notifier_block *nb)
{
blocking_notifier_chain_unregister(&node_chain, nb);
}
EXPORT_SYMBOL(unregister_node_notifier);
int node_notify(unsigned long val, void *v)
{
return blocking_notifier_call_chain(&node_chain, val, v);
}
#endif
static void node_remove_accesses(struct node *node)
{
struct node_access_nodes *c, *cnext;