linux-5.15/shrink_node_memcgs() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-5.15/shrink_node_memcgs() へ行く。
  • 1 (2025-09-11 (木) 18:11:18)

参照元†

• linux-5.15/shrink_node()

説明†

• パス: linux-5.15/mm/vmscan.c

• FIXME: これは何？
  • 説明

引数†

返り値†

参考†

実装†

static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc)
{
	struct mem_cgroup *target_memcg = sc->target_mem_cgroup;
	struct mem_cgroup *memcg;

	memcg = mem_cgroup_iter(target_memcg, NULL, NULL);

• • linux-5.15/mem_cgroup_iter()

	do {
		struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
		unsigned long reclaimed;
		unsigned long scanned;

• • linux-5.15/mem_cgroup_lruvec()

		/*
		 * This loop can become CPU-bound when target memcgs
		 * aren't eligible for reclaim - either because they
		 * don't have any reclaimable pages, or because their
		 * memory is explicitly protected. Avoid soft lockups.
		 */
		cond_resched();

		mem_cgroup_calculate_protection(target_memcg, memcg);

• • linux-5.15/cond_resched()
  • linux-5.15/mem_cgroup_calculate_protection()

		if (mem_cgroup_below_min(memcg)) {
			/*
			 * Hard protection.
			 * If there is no reclaimable memory, OOM.
			 */
			continue;

• • linux-5.15/mem_cgroup_below_min()

		} else if (mem_cgroup_below_low(memcg)) {
			/*
			 * Soft protection.
			 * Respect the protection only as long as
			 * there is an unprotected supply
			 * of reclaimable memory from other cgroups.
			 */
			if (!sc->memcg_low_reclaim) {
				sc->memcg_low_skipped = 1;
				continue;
			}
			memcg_memory_event(memcg, MEMCG_LOW);

• • linux-5.15/mem_cgroup_below_low()
  • linux-5.15/memcg_memory_event()

		}

		reclaimed = sc->nr_reclaimed;
		scanned = sc->nr_scanned;

		shrink_lruvec(lruvec, sc);

		shrink_slab(sc->gfp_mask, pgdat->node_id, memcg,
			    sc->priority);

• • linux-5.15/shrink_lruvec()
  • linux-5.15/shrink_slab()

		/* Record the group's reclaim efficiency */
		vmpressure(sc->gfp_mask, memcg, false,
			   sc->nr_scanned - scanned,
			   sc->nr_reclaimed - reclaimed);

	} while ((memcg = mem_cgroup_iter(target_memcg, memcg, NULL)));
}

• • linux-5.15/vmpressure()
  • linux-5.15/mem_cgroup_iter()

コメント†