linux-4.4.1/__rmqueue_fallback() 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_fallback() へ行く。
• linux-4.4.1/__rmqueue_fallback() の差分を削除

*参照元 [#w4ed7ec6]
#backlinks

*説明 [#af22a5c8]
-パス: [[linux-4.4.1/mm/page_alloc.c]]

-FIXME: これは何？
--説明


**引数 [#pf3dd2ed]
-struct zone *zone
--
--[[linux-4.4.1/zone]]
-unsigned int order
--
-int start_migratetype
--


**返り値 [#n4eb8dc6]
-struct page *
--
--[[linux-4.4.1/page]]


**参考 [#tf983043]


*実装 [#jb379114]
 /* Remove an element from the buddy allocator from the fallback list */
 static inline struct page *
 __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype)
 {
 	struct free_area *area;
 	unsigned int current_order;
 	struct page *page;
 	int fallback_mt;
 	bool can_steal;
 
-
--[[linux-4.4.1/free_area]]
--[[linux-4.4.1/page]]

 	/* Find the largest possible block of pages in the other list */
 	for (current_order = MAX_ORDER-1;
 				current_order >= order && current_order <= MAX_ORDER-1;
 				--current_order) {
 		area = &(zone->free_area[current_order]);
 		fallback_mt = find_suitable_fallback(area, current_order,
 				start_migratetype, false, &can_steal);
 		if (fallback_mt == -1)
 			continue;
 
-
--[[linux-4.4.1/find_suitable_fallback()]]

 		page = list_entry(area->free_list[fallback_mt].next,
 						struct page, lru);
 		if (can_steal)
 			steal_suitable_fallback(zone, page, start_migratetype);
 
-
--[[linux-4.4.1/list_entry()]]
--[[linux-4.4.1/steal_suitable_fallback()]]

 		/* Remove the page from the freelists */
 		area->nr_free--;
 		list_del(&page->lru);
 		rmv_page_order(page);
 
-
--[[linux-4.4.1/list_del()]]
--[[linux-4.4.1/rmv_page_order()]]

 		expand(zone, page, order, current_order, area,
 					start_migratetype);
-
--[[linux-4.4.1/expand()]]

 		/*
 		 * The pcppage_migratetype may differ from pageblock's
 		 * migratetype depending on the decisions in
 		 * find_suitable_fallback(). This is OK as long as it does not
 		 * differ for MIGRATE_CMA pageblocks. Those can be used as
 		 * fallback only via special __rmqueue_cma_fallback() function
 		 */
 		set_pcppage_migratetype(page, start_migratetype);
 
-
--[[linux-4.4.1/set_pcppage_migratetype()]]

 		trace_mm_page_alloc_extfrag(page, order, current_order,
 			start_migratetype, fallback_mt);
 
 		return page;
-
--[[linux-4.4.1/trace_mm_page_alloc_extfrag()]]

 	}
 
 	return NULL;
 }


*コメント [#t5857225]