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

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• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-5.15/shrink_inactive_list() へ行く。
  • 1 (2025-09-11 (木) 20:03:11)

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参照元†

• linux-5.15/shrink_list()

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†

/*
 * shrink_inactive_list() is a helper for shrink_node().  It returns the number
 * of reclaimed pages
 */
static unsigned long
shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
		     struct scan_control *sc, enum lru_list lru)
{
	LIST_HEAD(page_list);
	unsigned long nr_scanned;
	unsigned int nr_reclaimed = 0;
	unsigned long nr_taken;
	struct reclaim_stat stat;
	bool file = is_file_lru(lru);
	enum vm_event_item item;
	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
	bool stalled = false;

• • linux-5.15/LIST_HEAD()
  • linux-5.15/reclaim_stat
  • linux-5.15/is_file_lru()
  • linux-5.15/vm_event_item
  • linux-5.15/pglist_data
  • linux-5.15/lruvec_pgdat()

	while (unlikely(too_many_isolated(pgdat, file, sc))) {
		if (stalled)
			return 0;

		/* wait a bit for the reclaimer. */
		msleep(100);
		stalled = true;

		/* We are about to die and free our memory. Return now. */
		if (fatal_signal_pending(current))
			return SWAP_CLUSTER_MAX;
	}

• • linux-5.15/unlikely()
  • linux-5.15/too_many_isolated()
  • linux-5.15/msleep()
  • linux-5.15/fatal_signal_pending()

	lru_add_drain();

• • linux-5.15/lru_add_drain()

	spin_lock_irq(&lruvec->lru_lock);

	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
				     &nr_scanned, sc, lru);

• • linux-5.15/spin_lock_irq()
  • linux-5.15/isolate_lru_pages()

	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken);
	item = current_is_kswapd() ? PGSCAN_KSWAPD : PGSCAN_DIRECT;
	if (!cgroup_reclaim(sc))
		__count_vm_events(item, nr_scanned);
	__count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned);
	__count_vm_events(PGSCAN_ANON + file, nr_scanned);

	spin_unlock_irq(&lruvec->lru_lock);

• • linux-5.15/__mod_node_page_state()
  • linux-5.15/current_is_kswapd()
  • linux-5.15/cgroup_reclaim()
  • linux-5.15/lruvec_memcg()
  • linux-5.15/__count_vm_events()
  • linux-5.15/__count_memcg_events()
  • linux-5.15/spin_unlock_irq()

	if (nr_taken == 0)
		return 0;

	nr_reclaimed = shrink_page_list(&page_list, pgdat, sc, &stat, false);

• • linux-5.15/shrink_page_list()

	spin_lock_irq(&lruvec->lru_lock);
	move_pages_to_lru(lruvec, &page_list);

• • linux-5.15/spin_lock_irq()
  • linux-5.15/move_pages_to_lru()

	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
	item = current_is_kswapd() ? PGSTEAL_KSWAPD : PGSTEAL_DIRECT;
	if (!cgroup_reclaim(sc))
		__count_vm_events(item, nr_reclaimed);
	__count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
	__count_vm_events(PGSTEAL_ANON + file, nr_reclaimed);
	spin_unlock_irq(&lruvec->lru_lock);

• • linux-5.15/__mod_node_page_state()
  • linux-5.15/current_is_kswapd()
  • linux-5.15/cgroup_reclaim()
  • linux-5.15/__count_vm_events()
  • linux-5.15/__count_memcg_events()
  • linux-5.15/lruvec_memcg()
  • linux-5.15/spin_unlock_irq()

	lru_note_cost(lruvec, file, stat.nr_pageout);
	mem_cgroup_uncharge_list(&page_list);
	free_unref_page_list(&page_list);

• • linux-5.15/lru_note_cost()
  • linux-5.15/mem_cgroup_uncharge_list()
  • linux-5.15/free_unref_page_list()

	/*
	 * If dirty pages are scanned that are not queued for IO, it
	 * implies that flushers are not doing their job. This can
	 * happen when memory pressure pushes dirty pages to the end of
	 * the LRU before the dirty limits are breached and the dirty
	 * data has expired. It can also happen when the proportion of
	 * dirty pages grows not through writes but through memory
	 * pressure reclaiming all the clean cache. And in some cases,
	 * the flushers simply cannot keep up with the allocation
	 * rate. Nudge the flusher threads in case they are asleep.
	 */
	if (stat.nr_unqueued_dirty == nr_taken)
		wakeup_flusher_threads(WB_REASON_VMSCAN);

• • linux-5.15/wakeup_flusher_threads()

	sc->nr.dirty += stat.nr_dirty;
	sc->nr.congested += stat.nr_congested;
	sc->nr.unqueued_dirty += stat.nr_unqueued_dirty;
	sc->nr.writeback += stat.nr_writeback;
	sc->nr.immediate += stat.nr_immediate;
	sc->nr.taken += nr_taken;
	if (file)
		sc->nr.file_taken += nr_taken;

	trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id,
			nr_scanned, nr_reclaimed, &stat, sc->priority, file);
	return nr_reclaimed;
}

• • linux-5.15/trace_mm_vmscan_lru_shrink_inactive()

コメント†