linux-5.15/rmqueue_bulk() 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/rmqueue_bulk() へ行く。
  • 1 (2025-09-13 (土) 01:57:16)

参照元†

• linux-5.15/__rmqueue_pcplist()

説明†

• パス: linux-5.15/mm/page_alloc.c

• FIXME: これは何？
  • 説明

引数†

• struct zone *zone
  • [[linux-5.15/]]
• unsigned int order
• unsigned long count
• struct list_head *list
  • [[linux-5.15/]]
• int migratetype
• unsigned int alloc_flags

返り値†

• int

参考†

実装†

/*
 * Obtain a specified number of elements from the buddy allocator, all under
 * a single hold of the lock, for efficiency.  Add them to the supplied list.
 * Returns the number of new pages which were placed at *list.
 */
static int rmqueue_bulk(struct zone *zone, unsigned int order,
			unsigned long count, struct list_head *list,
			int migratetype, unsigned int alloc_flags)
{
	int i, allocated = 0;

	/*
	 * local_lock_irq held so equivalent to spin_lock_irqsave for
	 * both PREEMPT_RT and non-PREEMPT_RT configurations.
	 */
	spin_lock(&zone->lock);

• • linux-5.15/spin_lock()

	for (i = 0; i < count; ++i) {
		struct page *page = __rmqueue(zone, order, migratetype,
								alloc_flags);
		if (unlikely(page == NULL))
			break;

		if (unlikely(check_pcp_refill(page)))
			continue;

• • linux-5.15/page
  • linux-5.15/__rmqueue()
  • linux-5.15/unlikely()
  • linux-5.15/check_pcp_refill()

		/*
		 * Split buddy pages returned by expand() are received here in
		 * physical page order. The page is added to the tail of
		 * caller's list. From the callers perspective, the linked list
		 * is ordered by page number under some conditions. This is
		 * useful for IO devices that can forward direction from the
		 * head, thus also in the physical page order. This is useful
		 * for IO devices that can merge IO requests if the physical
		 * pages are ordered properly.
		 */
		list_add_tail(&page->lru, list);
		allocated++;
		if (is_migrate_cma(get_pcppage_migratetype(page)))
			__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
					      -(1 << order));
	}

• • linux-5.15/list_add_tail()
  • linux-5.15/is_migrate_cma()
  • linux-5.15/get_pcppage_migratetype()
  • linux-5.15/__mod_zone_page_state()

	/*
	 * i pages were removed from the buddy list even if some leak due
	 * to check_pcp_refill failing so adjust NR_FREE_PAGES based
	 * on i. Do not confuse with 'allocated' which is the number of
	 * pages added to the pcp list.
	 */
	__mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
	spin_unlock(&zone->lock);
	return allocated;
}

• • linux-5.15/__mod_zone_page_state()
  • linux-5.15/spin_unlock()

コメント†