| compaction.c (8348faf91f56371d4bada6fc5915e19580a15ffe) | compaction.c (9f7e3387939b036faacf4e7f32de7bb92a6635d6) |
|---|---|
| 1/* 2 * linux/mm/compaction.c 3 * 4 * Memory compaction for the reduction of external fragmentation. Note that 5 * this heavily depends upon page migration to do all the real heavy 6 * lifting 7 * 8 * Copyright IBM Corp. 2007-2010 Mel Gorman <mel@csn.ul.ie> --- 983 unchanged lines hidden (view full) --- 992 993 return pfn; 994} 995 996#endif /* CONFIG_COMPACTION || CONFIG_CMA */ 997#ifdef CONFIG_COMPACTION 998 999/* Returns true if the page is within a block suitable for migration to */ | 1/* 2 * linux/mm/compaction.c 3 * 4 * Memory compaction for the reduction of external fragmentation. Note that 5 * this heavily depends upon page migration to do all the real heavy 6 * lifting 7 * 8 * Copyright IBM Corp. 2007-2010 Mel Gorman <mel@csn.ul.ie> --- 983 unchanged lines hidden (view full) --- 992 993 return pfn; 994} 995 996#endif /* CONFIG_COMPACTION || CONFIG_CMA */ 997#ifdef CONFIG_COMPACTION 998 999/* Returns true if the page is within a block suitable for migration to */ |
| 1000static bool suitable_migration_target(struct page *page) | 1000static bool suitable_migration_target(struct compact_control *cc, 1001 struct page *page) |
| 1001{ | 1002{ |
| 1003 if (cc->ignore_block_suitable) 1004 return true; 1005 |
|
| 1002 /* If the page is a large free page, then disallow migration */ 1003 if (PageBuddy(page)) { 1004 /* 1005 * We are checking page_order without zone->lock taken. But 1006 * the only small danger is that we skip a potentially suitable 1007 * pageblock, so it's not worth to check order for valid range. 1008 */ 1009 if (page_order_unsafe(page) >= pageblock_order) --- 68 unchanged lines hidden (view full) --- 1078 break; 1079 1080 page = pageblock_pfn_to_page(block_start_pfn, block_end_pfn, 1081 zone); 1082 if (!page) 1083 continue; 1084 1085 /* Check the block is suitable for migration */ | 1006 /* If the page is a large free page, then disallow migration */ 1007 if (PageBuddy(page)) { 1008 /* 1009 * We are checking page_order without zone->lock taken. But 1010 * the only small danger is that we skip a potentially suitable 1011 * pageblock, so it's not worth to check order for valid range. 1012 */ 1013 if (page_order_unsafe(page) >= pageblock_order) --- 68 unchanged lines hidden (view full) --- 1082 break; 1083 1084 page = pageblock_pfn_to_page(block_start_pfn, block_end_pfn, 1085 zone); 1086 if (!page) 1087 continue; 1088 1089 /* Check the block is suitable for migration */ |
| 1086 if (!suitable_migration_target(page)) | 1090 if (!suitable_migration_target(cc, page)) |
| 1087 continue; 1088 1089 /* If isolation recently failed, do not retry */ 1090 if (!isolation_suitable(cc, page)) 1091 continue; 1092 1093 /* Found a block suitable for isolating free pages from. */ 1094 isolate_freepages_block(cc, &isolate_start_pfn, block_end_pfn, --- 556 unchanged lines hidden (view full) --- 1651 .gfp_mask = gfp_mask, 1652 .zone = zone, 1653 .mode = (prio == COMPACT_PRIO_ASYNC) ? 1654 MIGRATE_ASYNC : MIGRATE_SYNC_LIGHT, 1655 .alloc_flags = alloc_flags, 1656 .classzone_idx = classzone_idx, 1657 .direct_compaction = true, 1658 .whole_zone = (prio == MIN_COMPACT_PRIORITY), | 1091 continue; 1092 1093 /* If isolation recently failed, do not retry */ 1094 if (!isolation_suitable(cc, page)) 1095 continue; 1096 1097 /* Found a block suitable for isolating free pages from. */ 1098 isolate_freepages_block(cc, &isolate_start_pfn, block_end_pfn, --- 556 unchanged lines hidden (view full) --- 1655 .gfp_mask = gfp_mask, 1656 .zone = zone, 1657 .mode = (prio == COMPACT_PRIO_ASYNC) ? 1658 MIGRATE_ASYNC : MIGRATE_SYNC_LIGHT, 1659 .alloc_flags = alloc_flags, 1660 .classzone_idx = classzone_idx, 1661 .direct_compaction = true, 1662 .whole_zone = (prio == MIN_COMPACT_PRIORITY), |
| 1659 .ignore_skip_hint = (prio == MIN_COMPACT_PRIORITY) | 1663 .ignore_skip_hint = (prio == MIN_COMPACT_PRIORITY), 1664 .ignore_block_suitable = (prio == MIN_COMPACT_PRIORITY) |
| 1660 }; 1661 INIT_LIST_HEAD(&cc.freepages); 1662 INIT_LIST_HEAD(&cc.migratepages); 1663 1664 ret = compact_zone(zone, &cc); 1665 1666 VM_BUG_ON(!list_empty(&cc.freepages)); 1667 VM_BUG_ON(!list_empty(&cc.migratepages)); --- 399 unchanged lines hidden --- | 1665 }; 1666 INIT_LIST_HEAD(&cc.freepages); 1667 INIT_LIST_HEAD(&cc.migratepages); 1668 1669 ret = compact_zone(zone, &cc); 1670 1671 VM_BUG_ON(!list_empty(&cc.freepages)); 1672 VM_BUG_ON(!list_empty(&cc.migratepages)); --- 399 unchanged lines hidden --- |