linux-4.4.1/rmqueue_bulk() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/rmqueue_bulk() へ行く。
• linux-4.4.1/rmqueue_bulk() の差分を削除

*参照元 [#r9396f1b]
#backlinks

*説明 [#m3b6c6a3]
-パス: [[linux-4.4.1/mm/page_alloc.c]]

-FIXME: これは何？
--説明


**引数 [#s63d58ab]
-struct zone *zone
--
--[[linux-4.4.1/zone]]
-unsigned int order
--
-unsigned long count
--
-struct list_head *list
--
--[[linux-4.4.1/list_head]]
-int migratetype
--
--[[linux-4.4.1/cold]]
-bool cold
--


**返り値 [#fd50a6cc]
-int
--


**参考 [#g6660778]


*実装 [#zb8d4b8e]
 /*
  * 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, bool cold)
 {
 	int i;
 
 	spin_lock(&zone->lock);
-
--[[linux-4.4.1/spin_lock()]]

 	for (i = 0; i < count; ++i) {
 		struct page *page = __rmqueue(zone, order, migratetype, 0);
 		if (unlikely(page == NULL))
 			break;
 
-
--[[linux-4.4.1/page]]
--[[linux-4.4.1/__rmqueue()]]
--[[linux-4.4.1/unlikely()]]

 		/*
 		 * Split buddy pages returned by expand() are received here
 		 * in physical page order. The page is added to the callers and
 		 * list and the list head then moves forward. From the callers
 		 * perspective, the linked list is ordered by page number in
 		 * some conditions. This is useful for IO devices that can
 		 * merge IO requests if the physical pages are ordered
 		 * properly.
 		 */
 		if (likely(!cold))
 			list_add(&page->lru, list);
 		else
 			list_add_tail(&page->lru, list);
-
--[[linux-4.4.1/likely()]]
--[[linux-4.4.1/list_add()]]
--[[linux-4.4.1/list_add_tail()]]


 		list = &page->lru;
 		if (is_migrate_cma(get_pcppage_migratetype(page)))
 			__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
 					      -(1 << order));
-
--[[linux-4.4.1/is_migrate_cma()]]
--[[linux-4.4.1/get_pcppage_migratetype()]]
--[[linux-4.4.1/__mod_zone_page_state()]]

 	}
 	__mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
 	spin_unlock(&zone->lock);
-
--[[linux-4.4.1/__mod_zone_page_state()]]
--[[linux-4.4.1/spin_unlock()]]

 	return i;
 }


*コメント [#sb217229]