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

*参照元 [#taa07d25]
#backlinks

*説明 [#hbb765cc]
-パス: [[linux-4.4.1/mm/migrate.c]]

-FIXME: これは何？
--説明


**引数 [#jbc95353]
-new_page_t get_new_page
--
--[[linux-4.4.1/new_page_t]]
-free_page_t put_new_page
--
--[[linux-4.4.1/free_page_t]]
-unsigned long private
--
-struct page *page
--
--[[linux-4.4.1/page]]
-int force
--
-enum migrate_mode mode
--
--[[linux-4.4.1/migrate_mode]]
-enum migrate_reason reason
--
--[[linux-4.4.1/migrate_reason]]


**返り値 [#d99e7c18]
-int
--


**参考 [#j8f89e6c]


*実装 [#a03c92d2]
 /*
  * Obtain the lock on page, remove all ptes and migrate the page
  * to the newly allocated page in newpage.
  */
 static ICE_noinline int unmap_and_move(new_page_t get_new_page,
 				   free_page_t put_new_page,
 				   unsigned long private, struct page *page,
 				   int force, enum migrate_mode mode,
 				   enum migrate_reason reason)
 {
 	int rc = MIGRATEPAGE_SUCCESS;
 	int *result = NULL;
 	struct page *newpage;
 
-
--[[linux-4.4.1/ICE_noinline]]

 	newpage = get_new_page(page, private, &result);
 	if (!newpage)
 		return -ENOMEM;
 
-get_new_page は引数で渡されている関数ポインタ。

 	if (page_count(page) == 1) {
 		/* page was freed from under us. So we are done. */
 		goto out;
 	}
 
-
--[[linux-4.4.1/page_count()]]

 	if (unlikely(PageTransHuge(page)))
 		if (unlikely(split_huge_page(page)))
 			goto out;
 
-
--[[linux-4.4.1/PageTransHuge()]]
--[[linux-4.4.1/split_huge_page()]]
--[[linux-4.4.1/unlikely()]]

 	rc = __unmap_and_move(page, newpage, force, mode);
 	if (rc == MIGRATEPAGE_SUCCESS)
 		put_new_page = NULL;
 
-
--[[linux-4.4.1/__unmap_and_move()]]

 out:
 	if (rc != -EAGAIN) {
 		/*
 		 * A page that has been migrated has all references
 		 * removed and will be freed. A page that has not been
 		 * migrated will have kepts its references and be
 		 * restored.
 		 */
 		list_del(&page->lru);
 		dec_zone_page_state(page, NR_ISOLATED_ANON +
 				page_is_file_cache(page));
-
--[[linux-4.4.1/list_del()]]
--[[linux-4.4.1/dec_zone_page_state()]]
--[[linux-4.4.1/page_is_file_cache()]]

 		/* Soft-offlined page shouldn't go through lru cache list */
 		if (reason == MR_MEMORY_FAILURE) {
 			put_page(page);
 			if (!test_set_page_hwpoison(page))
 				num_poisoned_pages_inc();
 		} else
 			putback_lru_page(page);
-
--[[linux-4.4.1/put_page()]]
--[[linux-4.4.1/test_set_page_hwpoison()]]
--[[linux-4.4.1/num_poisoned_pages_inc()]]
--[[linux-4.4.1/putback_lru_page()]]

 	}
 
 	/*
 	 * If migration was not successful and there's a freeing callback, use
 	 * it.  Otherwise, putback_lru_page() will drop the reference grabbed
 	 * during isolation.
 	 */
 	if (put_new_page)
 		put_new_page(newpage, private);
-put_new_page は引数で渡されている関数ポインタ

 	else if (unlikely(__is_movable_balloon_page(newpage))) {
 		/* drop our reference, page already in the balloon */
 		put_page(newpage);
-
--[[linux-4.4.1/__is_movable_baloon_page()]]
--[[linux-4.4.1/__is_movable_balloon_page()]]
--[[linux-4.4.1/put_page()]]

 	} else
 		putback_lru_page(newpage);
 
-
--[[linux-4.4.1/putback_lru_page()]]

 	if (result) {
 		if (rc)
 			*result = rc;
 		else
 			*result = page_to_nid(newpage);
 	}
-
--[[linux-4.4.1/page_to_nid()]]

 	return rc;
 }


*コメント [#i5329ad1]