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

*参照元 [#ae8330d9]
#backlinks

*説明 [#m2c88b98]
-パス: [[linux-4.4.1/mm/migrate.c]]

-FIXME: これは何？
--説明


**引数 [#p269081a]
-struct page *newpage
--
--[[linux-4.4.1/page]]
-struct page *page
--
--[[linux-4.4.1/page]]
-enum migrate_mode mode
--
--[[linux-4.4.1/migrate_mode]]


**返り値 [#sfc6b4d5]
-int
--


**参考 [#ie84a2f8]


*実装 [#tc8b39bc]
 /*
  * Move a page to a newly allocated page
  * The page is locked and all ptes have been successfully removed.
  *
  * The new page will have replaced the old page if this function
  * is successful.
  *
  * Return value:
  *   < 0 - error code
  *  MIGRATEPAGE_SUCCESS - success
  */
 static int move_to_new_page(struct page *newpage, struct page *page,
 				enum migrate_mode mode)
 {
 	struct address_space *mapping;
 	int rc;
 
-
--[[linux-4.4.1/address_space]]

 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
 
-
--[[linux-4.4.1/VM_BUG_ON_PAGE()]]
--[[linux-4.4.1/PageLocked()]]

 	mapping = page_mapping(page);
 	if (!mapping)
 		rc = migrate_page(mapping, newpage, page, mode);
-
--[[linux-4.4.1/page_mapping()]]
--[[linux-4.4.1/migrate_page()]]

 	else if (mapping->a_ops->migratepage)
 		/*
 		 * Most pages have a mapping and most filesystems provide a
 		 * migratepage callback. Anonymous pages are part of swap
 		 * space which also has its own migratepage callback. This
 		 * is the most common path for page migration.
 		 */
 		rc = mapping->a_ops->migratepage(mapping, newpage, page, mode);
-
--mapping->a_ops は const struct address_space_operations * 型
--[[linux-4.4.1/address_space_operations]]

 	else
 		rc = fallback_migrate_page(mapping, newpage, page, mode);
 
-
--[[linux-4.4.1/fallback_migrate_page()]]

 	/*
 	 * When successful, old pagecache page->mapping must be cleared before
 	 * page is freed; but stats require that PageAnon be left as PageAnon.
 	 */
 	if (rc == MIGRATEPAGE_SUCCESS) {
 		set_page_memcg(page, NULL);
 		if (!PageAnon(page))
 			page->mapping = NULL;
 	}
-
--[[linux-4.4.1/set_page_memcg()]]
--[[linux-4.4.1/PageAnon()]]

 	return rc;
 }


*コメント [#t2e92344]