// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  Swap reorganised 29.12.95, Stephen Tweedie.
 *  kswapd added: 7.1.96  sct
 *  Removed kswapd_ctl limits, and swap out as many pages as needed
 *  to bring the system back to freepages.high: 2.4.97, Rik van Riel.
 *  Zone aware kswapd started 02/00, Kanoj Sarcar (kanoj@sgi.com).
 *  Multiqueue VM started 5.8.00, Rik van Riel.
 */

/* Extracted unchanged from Linux v6.12, mm/vmscan.c:6605-6629.
 * Full function definition; surrounding kernel context is required.
 * Source: https://github.com/torvalds/linux/blob/v6.12/mm/vmscan.c#L6605
 * License text: GPL-2.0.txt (in this directory).
 */
static void kswapd_age_node(struct pglist_data *pgdat, struct scan_control *sc)
{
	struct mem_cgroup *memcg;
	struct lruvec *lruvec;

	if (lru_gen_enabled()) {
		lru_gen_age_node(pgdat, sc);
		return;
	}

	if (!can_age_anon_pages(pgdat, sc))
		return;

	lruvec = mem_cgroup_lruvec(NULL, pgdat);
	if (!inactive_is_low(lruvec, LRU_INACTIVE_ANON))
		return;

	memcg = mem_cgroup_iter(NULL, NULL, NULL);
	do {
		lruvec = mem_cgroup_lruvec(memcg, pgdat);
		shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
				   sc, LRU_ACTIVE_ANON);
		memcg = mem_cgroup_iter(NULL, memcg, NULL);
	} while (memcg);
}