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

*参照元 [#sc89772b]
#backlinks

*説明 [#m2d3f889]
-パス: [[linux-4.4.1/mm/compaction.c]]

-FIXME: これは何？
--説明


**引数 [#nb9654e7]
-struct compact_control *cc
--
--[[linux-4.4.1/compact_control]]
-unsigned long start_pfn
--
-unsigned long end_pfn
--


**返り値 [#e79f85d3]
-unsigned long
--


**参考 [#ka8688b1]


*実装 [#t51f01fb]
 /**
  * isolate_migratepages_range() - isolate migrate-able pages in a PFN range
  * @cc:        Compaction control structure.
  * @start_pfn: The first PFN to start isolating.
  * @end_pfn:   The one-past-last PFN.
  *
  * Returns zero if isolation fails fatally due to e.g. pending signal.
  * Otherwise, function returns one-past-the-last PFN of isolated page
  * (which may be greater than end_pfn if end fell in a middle of a THP page).
  */
 unsigned long
 isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn,
 							unsigned long end_pfn)
 {
 	unsigned long pfn, block_end_pfn;
 
 	/* Scan block by block. First and last block may be incomplete */
 	pfn = start_pfn;
 	block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
 
-
--[[linux-4.4.1/ALIGN()]]
--[[linux-4.4.1/pageblock_nr_pages(global)]]

 	for (; pfn < end_pfn; pfn = block_end_pfn,
 				block_end_pfn += pageblock_nr_pages) {
 
 		block_end_pfn = min(block_end_pfn, end_pfn);
 
 		if (!pageblock_pfn_to_page(pfn, block_end_pfn, cc->zone))
 			continue;
 
-範囲が大きいときは、一度に pageblock_nr_pages ページずつ処理する。
--[[linux-4.4.1/pageblock_pfn_to_page()]]

 		pfn = isolate_migratepages_block(cc, pfn, block_end_pfn,
 							ISOLATE_UNEVICTABLE);
 
-
--[[linux-4.4.1/isolate_migratepages_block()]]

 		/*
 		 * In case of fatal failure, release everything that might
 		 * have been isolated in the previous iteration, and signal
 		 * the failure back to caller.
 		 */
 		if (!pfn) {
 			putback_movable_pages(&cc->migratepages);
 			cc->nr_migratepages = 0;
 			break;
 		}
 
-
--[[linux-4.4.1/putback_movable_pages()]]

 		if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
 			break;
 	}
 	acct_isolated(cc->zone, cc);
 
-
--[[linux-4.4.1/acct_isolated()]]

 	return pfn;
 }


*コメント [#z5929465]