Lines Matching +full:active +full:- +full:distance
1 // SPDX-License-Identifier: GPL-2.0
9 * Copyright IBM Corp. 2007-2010 Mel Gorman <mel@csn.ul.ie>
17 #include <linux/backing-dev.h>
20 #include <linux/page-isolation.h>
59 * Page order with-respect-to which proactive compaction
68 #define COMPACTION_HPAGE_ORDER (PMD_SHIFT - PAGE_SHIFT)
78 list_del(&page->lru); in release_freepages()
94 list_del(&page->lru); in split_map_pages()
104 list_add(&page->lru, &tmp_list); in split_map_pages()
123 if (mapping && mapping->a_ops && mapping->a_ops->isolate_page) in PageMovable()
134 page->mapping = (void *)((unsigned long)mapping | PAGE_MAPPING_MOVABLE); in __SetPageMovable()
146 page->mapping = (void *)((unsigned long)page->mapping & in __ClearPageMovable()
161 zone->compact_considered = 0; in defer_compaction()
162 zone->compact_defer_shift++; in defer_compaction()
164 if (order < zone->compact_order_failed) in defer_compaction()
165 zone->compact_order_failed = order; in defer_compaction()
167 if (zone->compact_defer_shift > COMPACT_MAX_DEFER_SHIFT) in defer_compaction()
168 zone->compact_defer_shift = COMPACT_MAX_DEFER_SHIFT; in defer_compaction()
176 unsigned long defer_limit = 1UL << zone->compact_defer_shift; in compaction_deferred()
178 if (order < zone->compact_order_failed) in compaction_deferred()
182 if (++zone->compact_considered >= defer_limit) { in compaction_deferred()
183 zone->compact_considered = defer_limit; in compaction_deferred()
201 zone->compact_considered = 0; in compaction_defer_reset()
202 zone->compact_defer_shift = 0; in compaction_defer_reset()
204 if (order >= zone->compact_order_failed) in compaction_defer_reset()
205 zone->compact_order_failed = order + 1; in compaction_defer_reset()
213 if (order < zone->compact_order_failed) in compaction_restarting()
216 return zone->compact_defer_shift == COMPACT_MAX_DEFER_SHIFT && in compaction_restarting()
217 zone->compact_considered >= 1UL << zone->compact_defer_shift; in compaction_restarting()
224 if (cc->ignore_skip_hint) in isolation_suitable()
232 zone->compact_cached_migrate_pfn[0] = zone->zone_start_pfn; in reset_cached_positions()
233 zone->compact_cached_migrate_pfn[1] = zone->zone_start_pfn; in reset_cached_positions()
234 zone->compact_cached_free_pfn = in reset_cached_positions()
235 pageblock_start_pfn(zone_end_pfn(zone) - 1); in reset_cached_positions()
281 * non-movable pageblock as the starting point. in __reset_isolation_pfn()
289 block_pfn = max(block_pfn, zone->zone_start_pfn); in __reset_isolation_pfn()
297 block_pfn = pageblock_end_pfn(pfn) - 1; in __reset_isolation_pfn()
298 block_pfn = min(block_pfn, zone_end_pfn(zone) - 1); in __reset_isolation_pfn()
333 unsigned long migrate_pfn = zone->zone_start_pfn; in __reset_isolation_suitable()
334 unsigned long free_pfn = zone_end_pfn(zone) - 1; in __reset_isolation_suitable()
340 if (!zone->compact_blockskip_flush) in __reset_isolation_suitable()
343 zone->compact_blockskip_flush = false; in __reset_isolation_suitable()
352 free_pfn -= pageblock_nr_pages) { in __reset_isolation_suitable()
360 zone->compact_init_migrate_pfn = reset_migrate; in __reset_isolation_suitable()
361 zone->compact_cached_migrate_pfn[0] = reset_migrate; in __reset_isolation_suitable()
362 zone->compact_cached_migrate_pfn[1] = reset_migrate; in __reset_isolation_suitable()
370 zone->compact_init_free_pfn = reset_free; in __reset_isolation_suitable()
371 zone->compact_cached_free_pfn = reset_free; in __reset_isolation_suitable()
375 /* Leave no distance if no suitable block was reset */ in __reset_isolation_suitable()
377 zone->compact_cached_migrate_pfn[0] = migrate_pfn; in __reset_isolation_suitable()
378 zone->compact_cached_migrate_pfn[1] = migrate_pfn; in __reset_isolation_suitable()
379 zone->compact_cached_free_pfn = free_pfn; in __reset_isolation_suitable()
388 struct zone *zone = &pgdat->node_zones[zoneid]; in reset_isolation_suitable()
393 if (zone->compact_blockskip_flush) in reset_isolation_suitable()
408 if (cc->ignore_skip_hint) in test_and_set_skip()
415 if (!skip && !cc->no_set_skip_hint) in test_and_set_skip()
423 struct zone *zone = cc->zone; in update_cached_migrate()
428 if (cc->no_set_skip_hint) in update_cached_migrate()
431 if (pfn > zone->compact_cached_migrate_pfn[0]) in update_cached_migrate()
432 zone->compact_cached_migrate_pfn[0] = pfn; in update_cached_migrate()
433 if (cc->mode != MIGRATE_ASYNC && in update_cached_migrate()
434 pfn > zone->compact_cached_migrate_pfn[1]) in update_cached_migrate()
435 zone->compact_cached_migrate_pfn[1] = pfn; in update_cached_migrate()
445 struct zone *zone = cc->zone; in update_pageblock_skip()
447 if (cc->no_set_skip_hint) in update_pageblock_skip()
456 if (pfn < zone->compact_cached_free_pfn) in update_pageblock_skip()
457 zone->compact_cached_free_pfn = pfn; in update_pageblock_skip()
501 if (cc->mode == MIGRATE_ASYNC && !cc->contended) { in compact_lock_irqsave()
505 cc->contended = true; in compact_lock_irqsave()
536 cc->contended = true; in compact_unlock_should_abort()
547 * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
581 && compact_unlock_should_abort(&cc->zone->lock, flags, in isolate_freepages_block()
597 blockpfn += (1UL << order) - 1; in isolate_freepages_block()
598 cursor += (1UL << order) - 1; in isolate_freepages_block()
614 locked = compact_lock_irqsave(&cc->zone->lock, in isolate_freepages_block()
622 /* Found a free page, will break it into order-0 pages */ in isolate_freepages_block()
630 cc->nr_freepages += isolated; in isolate_freepages_block()
631 list_add_tail(&page->lru, freelist); in isolate_freepages_block()
633 if (!strict && cc->nr_migratepages <= cc->nr_freepages) { in isolate_freepages_block()
638 blockpfn += isolated - 1; in isolate_freepages_block()
639 cursor += isolated - 1; in isolate_freepages_block()
651 spin_unlock_irqrestore(&cc->zone->lock, flags); in isolate_freepages_block()
674 cc->total_free_scanned += nr_scanned; in isolate_freepages_block()
681 * isolate_freepages_range() - isolate free pages.
684 * @end_pfn: The one-past-last PFN.
686 * Non-free pages, invalid PFNs, or zone boundaries within the
690 * Otherwise, function returns one-past-the-last PFN of isolated page
703 if (block_start_pfn < cc->zone->zone_start_pfn) in isolate_freepages_range()
704 block_start_pfn = cc->zone->zone_start_pfn; in isolate_freepages_range()
727 block_end_pfn, cc->zone)) in isolate_freepages_range()
736 * non-free pages). in isolate_freepages_range()
743 * pageblock_nr_pages for some non-negative n. (Max order in isolate_freepages_range()
764 unsigned long active, inactive, isolated; in too_many_isolated() local
768 active = node_page_state(pgdat, NR_ACTIVE_FILE) + in too_many_isolated()
773 return isolated > (inactive + active) / 2; in too_many_isolated()
777 * isolate_migratepages_block() - isolate all migrate-able pages within
781 * @end_pfn: The one-past-the-last PFN to isolate, within same pageblock
786 * Returns errno, like -EAGAIN or -EINTR in case e.g signal pending or congestion,
787 * -ENOMEM in case we could not allocate a page, or 0.
788 * cc->migrate_pfn will contain the next pfn to scan.
790 * The pages are isolated on cc->migratepages list (not required to be empty),
791 * and cc->nr_migratepages is updated accordingly.
797 pg_data_t *pgdat = cc->zone->zone_pgdat; in isolate_migratepages_block()
809 cc->migrate_pfn = low_pfn; in isolate_migratepages_block()
818 if (cc->nr_migratepages) in isolate_migratepages_block()
819 return -EAGAIN; in isolate_migratepages_block()
822 if (cc->mode == MIGRATE_ASYNC) in isolate_migratepages_block()
823 return -EAGAIN; in isolate_migratepages_block()
828 return -EINTR; in isolate_migratepages_block()
833 if (cc->direct_compaction && (cc->mode == MIGRATE_ASYNC)) { in isolate_migratepages_block()
835 next_skip_pfn = block_end_pfn(low_pfn, cc->order); in isolate_migratepages_block()
844 * previous order-aligned block, and did not skip it due in isolate_migratepages_block()
852 * We failed to isolate in the previous order-aligned in isolate_migratepages_block()
857 * a compound or a high-order buddy page in the in isolate_migratepages_block()
860 next_skip_pfn = block_end_pfn(low_pfn, cc->order); in isolate_migratepages_block()
875 cc->contended = true; in isolate_migratepages_block()
876 ret = -EINTR; in isolate_migratepages_block()
895 if (!cc->ignore_skip_hint && get_pageblock_skip(page)) { in isolate_migratepages_block()
903 if (PageHuge(page) && cc->alloc_contig) { in isolate_migratepages_block()
904 ret = isolate_or_dissolve_huge_page(page, &cc->migratepages); in isolate_migratepages_block()
908 * reports an error. In case of -ENOMEM, abort right away. in isolate_migratepages_block()
911 /* Do not report -EBUSY down the chain */ in isolate_migratepages_block()
912 if (ret == -EBUSY) in isolate_migratepages_block()
914 low_pfn += (1UL << compound_order(page)) - 1; in isolate_migratepages_block()
921 * on the cc->migratepages list. in isolate_migratepages_block()
923 low_pfn += compound_nr(page) - 1; in isolate_migratepages_block()
929 * Buddy and cannot be re-allocated because they are in isolate_migratepages_block()
930 * isolated. Fall-through as the check below handles in isolate_migratepages_block()
950 low_pfn += (1UL << freepage_order) - 1; in isolate_migratepages_block()
962 if (PageCompound(page) && !cc->alloc_contig) { in isolate_migratepages_block()
966 low_pfn += (1UL << order) - 1; in isolate_migratepages_block()
972 * It's possible to migrate LRU and non-lru movable pages. in isolate_migratepages_block()
1007 if (!(cc->gfp_mask & __GFP_FS) && page_mapping(page)) in isolate_migratepages_block()
1012 * sure the page is not being freed elsewhere -- the in isolate_migratepages_block()
1032 compact_lock_irqsave(&lruvec->lru_lock, &flags, cc); in isolate_migratepages_block()
1045 * Page become compound since the non-locked check, in isolate_migratepages_block()
1049 if (unlikely(PageCompound(page) && !cc->alloc_contig)) { in isolate_migratepages_block()
1050 low_pfn += compound_nr(page) - 1; in isolate_migratepages_block()
1058 low_pfn += compound_nr(page) - 1; in isolate_migratepages_block()
1067 list_add(&page->lru, &cc->migratepages); in isolate_migratepages_block()
1069 cc->nr_migratepages += compound_nr(page); in isolate_migratepages_block()
1078 if (cc->nr_migratepages >= COMPACT_CLUSTER_MAX && in isolate_migratepages_block()
1079 !cc->rescan && !cc->contended) { in isolate_migratepages_block()
1095 if (!skip_on_failure && ret != -ENOMEM) in isolate_migratepages_block()
1100 * instead of migrating, as we cannot form the cc->order buddy in isolate_migratepages_block()
1108 putback_movable_pages(&cc->migratepages); in isolate_migratepages_block()
1109 cc->nr_migratepages = 0; in isolate_migratepages_block()
1114 low_pfn = next_skip_pfn - 1; in isolate_migratepages_block()
1119 next_skip_pfn += 1UL << cc->order; in isolate_migratepages_block()
1122 if (ret == -ENOMEM) in isolate_migratepages_block()
1151 if (low_pfn == end_pfn && (!nr_isolated || cc->rescan)) { in isolate_migratepages_block()
1161 cc->total_migrate_scanned += nr_scanned; in isolate_migratepages_block()
1165 cc->migrate_pfn = low_pfn; in isolate_migratepages_block()
1171 * isolate_migratepages_range() - isolate migrate-able pages in a PFN range
1174 * @end_pfn: The one-past-last PFN.
1176 * Returns -EAGAIN when contented, -EINTR in case of a signal pending, -ENOMEM
1189 if (block_start_pfn < cc->zone->zone_start_pfn) in isolate_migratepages_range()
1190 block_start_pfn = cc->zone->zone_start_pfn; in isolate_migratepages_range()
1200 block_end_pfn, cc->zone)) in isolate_migratepages_range()
1209 if (cc->nr_migratepages >= COMPACT_CLUSTER_MAX) in isolate_migratepages_range()
1227 if ((cc->mode != MIGRATE_ASYNC) || !cc->direct_compaction) in suitable_migration_source()
1232 if (cc->migratetype == MIGRATE_MOVABLE) in suitable_migration_source()
1235 return block_mt == cc->migratetype; in suitable_migration_source()
1245 * We are checking page_order without zone->lock taken. But in suitable_migration_target()
1253 if (cc->ignore_block_suitable) in suitable_migration_target()
1267 unsigned short shift = BITS_PER_LONG - 1; in freelist_scan_limit()
1269 return (COMPACT_CLUSTER_MAX >> min(shift, cc->fast_search_fail)) + 1; in freelist_scan_limit()
1278 return (cc->free_pfn >> pageblock_order) in compact_scanners_met()
1279 <= (cc->migrate_pfn >> pageblock_order); in compact_scanners_met()
1292 if (!list_is_last(freelist, &freepage->lru)) { in move_freelist_head()
1293 list_cut_before(&sublist, freelist, &freepage->lru); in move_freelist_head()
1309 if (!list_is_first(freelist, &freepage->lru)) { in move_freelist_tail()
1310 list_cut_position(&sublist, freelist, &freepage->lru); in move_freelist_tail()
1322 if (cc->nr_freepages >= cc->nr_migratepages) in fast_isolate_around()
1326 if (cc->direct_compaction && cc->mode == MIGRATE_ASYNC) in fast_isolate_around()
1330 start_pfn = max(pageblock_start_pfn(pfn), cc->zone->zone_start_pfn); in fast_isolate_around()
1331 end_pfn = min(pageblock_end_pfn(pfn), zone_end_pfn(cc->zone)); in fast_isolate_around()
1333 page = pageblock_pfn_to_page(start_pfn, end_pfn, cc->zone); in fast_isolate_around()
1339 isolate_freepages_block(cc, &start_pfn, pfn, &cc->freepages, 1, false); in fast_isolate_around()
1340 if (cc->nr_freepages >= cc->nr_migratepages) in fast_isolate_around()
1347 isolate_freepages_block(cc, &start_pfn, end_pfn, &cc->freepages, 1, false); in fast_isolate_around()
1350 if (cc->nr_freepages < cc->nr_migratepages) in fast_isolate_around()
1354 /* Search orders in round-robin fashion */
1357 order--; in next_search_order()
1359 order = cc->order - 1; in next_search_order()
1362 if (order == cc->search_order) { in next_search_order()
1363 cc->search_order--; in next_search_order()
1364 if (cc->search_order < 0) in next_search_order()
1365 cc->search_order = cc->order - 1; in next_search_order()
1366 return -1; in next_search_order()
1379 unsigned long distance; in fast_isolate_freepages() local
1385 if (cc->order <= 0) in fast_isolate_freepages()
1386 return cc->free_pfn; in fast_isolate_freepages()
1392 if (cc->free_pfn >= cc->zone->compact_init_free_pfn) { in fast_isolate_freepages()
1401 distance = (cc->free_pfn - cc->migrate_pfn); in fast_isolate_freepages()
1402 low_pfn = pageblock_start_pfn(cc->free_pfn - (distance >> 2)); in fast_isolate_freepages()
1403 min_pfn = pageblock_start_pfn(cc->free_pfn - (distance >> 1)); in fast_isolate_freepages()
1412 cc->search_order = min_t(unsigned int, cc->order - 1, cc->search_order); in fast_isolate_freepages()
1414 for (order = cc->search_order; in fast_isolate_freepages()
1417 struct free_area *area = &cc->zone->free_area[order]; in fast_isolate_freepages()
1424 if (!area->nr_free) in fast_isolate_freepages()
1427 spin_lock_irqsave(&cc->zone->lock, flags); in fast_isolate_freepages()
1428 freelist = &area->free_list[MIGRATE_MOVABLE]; in fast_isolate_freepages()
1438 cc->zone->zone_start_pfn); in fast_isolate_freepages()
1441 cc->fast_search_fail = 0; in fast_isolate_freepages()
1442 cc->search_order = order; in fast_isolate_freepages()
1474 cc->nr_freepages += nr_isolated; in fast_isolate_freepages()
1475 list_add_tail(&page->lru, &cc->freepages); in fast_isolate_freepages()
1479 order = cc->search_order + 1; in fast_isolate_freepages()
1484 spin_unlock_irqrestore(&cc->zone->lock, flags); in fast_isolate_freepages()
1495 cc->fast_search_fail++; in fast_isolate_freepages()
1504 cc->free_pfn = highest; in fast_isolate_freepages()
1506 if (cc->direct_compaction && pfn_valid(min_pfn)) { in fast_isolate_freepages()
1509 zone_end_pfn(cc->zone)), in fast_isolate_freepages()
1510 cc->zone); in fast_isolate_freepages()
1511 cc->free_pfn = min_pfn; in fast_isolate_freepages()
1517 if (highest && highest >= cc->zone->compact_cached_free_pfn) { in fast_isolate_freepages()
1518 highest -= pageblock_nr_pages; in fast_isolate_freepages()
1519 cc->zone->compact_cached_free_pfn = highest; in fast_isolate_freepages()
1522 cc->total_free_scanned += nr_scanned; in fast_isolate_freepages()
1524 return cc->free_pfn; in fast_isolate_freepages()
1537 struct zone *zone = cc->zone; in isolate_freepages()
1543 struct list_head *freelist = &cc->freepages; in isolate_freepages()
1548 if (cc->nr_freepages) in isolate_freepages()
1553 * successfully isolated from, zone-cached value, or the end of the in isolate_freepages()
1556 * block_start_pfn -= pageblock_nr_pages in the for loop. in isolate_freepages()
1562 isolate_start_pfn = cc->free_pfn; in isolate_freepages()
1566 low_pfn = pageblock_end_pfn(cc->migrate_pfn); in isolate_freepages()
1567 stride = cc->mode == MIGRATE_ASYNC ? COMPACT_CLUSTER_MAX : 1; in isolate_freepages()
1571 * pages on cc->migratepages. We stop searching if the migrate in isolate_freepages()
1576 block_start_pfn -= pageblock_nr_pages, in isolate_freepages()
1609 if (cc->nr_freepages >= cc->nr_migratepages) { in isolate_freepages()
1616 block_start_pfn - pageblock_nr_pages; in isolate_freepages()
1641 cc->free_pfn = isolate_start_pfn; in isolate_freepages()
1649 * This is a migrate-callback that "allocates" freepages by taking pages
1658 if (list_empty(&cc->freepages)) { in compaction_alloc()
1661 if (list_empty(&cc->freepages)) in compaction_alloc()
1665 freepage = list_entry(cc->freepages.next, struct page, lru); in compaction_alloc()
1666 list_del(&freepage->lru); in compaction_alloc()
1667 cc->nr_freepages--; in compaction_alloc()
1673 * This is a migrate-callback that "frees" freepages back to the isolated
1681 list_add(&page->lru, &cc->freepages); in compaction_free()
1682 cc->nr_freepages++; in compaction_free()
1705 if (cc->fast_start_pfn == ULONG_MAX) in update_fast_start_pfn()
1708 if (!cc->fast_start_pfn) in update_fast_start_pfn()
1709 cc->fast_start_pfn = pfn; in update_fast_start_pfn()
1711 cc->fast_start_pfn = min(cc->fast_start_pfn, pfn); in update_fast_start_pfn()
1717 if (!cc->fast_start_pfn || cc->fast_start_pfn == ULONG_MAX) in reinit_migrate_pfn()
1718 return cc->migrate_pfn; in reinit_migrate_pfn()
1720 cc->migrate_pfn = cc->fast_start_pfn; in reinit_migrate_pfn()
1721 cc->fast_start_pfn = ULONG_MAX; in reinit_migrate_pfn()
1723 return cc->migrate_pfn; in reinit_migrate_pfn()
1735 unsigned long distance; in fast_find_migrateblock() local
1736 unsigned long pfn = cc->migrate_pfn; in fast_find_migrateblock()
1742 if (cc->ignore_skip_hint) in fast_find_migrateblock()
1750 if (pfn != cc->zone->zone_start_pfn && pfn != pageblock_start_pfn(pfn)) in fast_find_migrateblock()
1758 if (cc->order <= PAGE_ALLOC_COSTLY_ORDER) in fast_find_migrateblock()
1767 if (cc->direct_compaction && cc->migratetype != MIGRATE_MOVABLE) in fast_find_migrateblock()
1776 distance = (cc->free_pfn - cc->migrate_pfn) >> 1; in fast_find_migrateblock()
1777 if (cc->migrate_pfn != cc->zone->zone_start_pfn) in fast_find_migrateblock()
1778 distance >>= 2; in fast_find_migrateblock()
1779 high_pfn = pageblock_start_pfn(cc->migrate_pfn + distance); in fast_find_migrateblock()
1781 for (order = cc->order - 1; in fast_find_migrateblock()
1783 order--) { in fast_find_migrateblock()
1784 struct free_area *area = &cc->zone->free_area[order]; in fast_find_migrateblock()
1789 if (!area->nr_free) in fast_find_migrateblock()
1792 spin_lock_irqsave(&cc->zone->lock, flags); in fast_find_migrateblock()
1793 freelist = &area->free_list[MIGRATE_MOVABLE]; in fast_find_migrateblock()
1818 cc->fast_search_fail = 0; in fast_find_migrateblock()
1824 spin_unlock_irqrestore(&cc->zone->lock, flags); in fast_find_migrateblock()
1827 cc->total_migrate_scanned += nr_scanned; in fast_find_migrateblock()
1834 cc->fast_search_fail++; in fast_find_migrateblock()
1853 (cc->mode != MIGRATE_SYNC ? ISOLATE_ASYNC_MIGRATE : 0); in isolate_migratepages()
1863 if (block_start_pfn < cc->zone->zone_start_pfn) in isolate_migratepages()
1864 block_start_pfn = cc->zone->zone_start_pfn; in isolate_migratepages()
1871 fast_find_block = low_pfn != cc->migrate_pfn && !cc->fast_search_fail; in isolate_migratepages()
1880 for (; block_end_pfn <= cc->free_pfn; in isolate_migratepages()
1882 cc->migrate_pfn = low_pfn = block_end_pfn, in isolate_migratepages()
1895 block_end_pfn, cc->zone); in isolate_migratepages()
1936 return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE; in isolate_migratepages()
1940 * order == -1 is expected when compacting via
1945 return order == -1; in is_via_compact_memory()
1950 return pgdat->kswapd && task_is_running(pgdat->kswapd); in kswapd_is_running()
1976 score = zone->present_pages * fragmentation_score_zone(zone); in fragmentation_score_zone_weighted()
1977 return div64_ul(score, zone->zone_pgdat->node_present_pages + 1); in fragmentation_score_zone_weighted()
1981 * The per-node proactive (background) compaction process is started by its
1983 * exceeds the high threshold. The compaction process remains active till
1984 * the node's score falls below the low threshold, or one of the back-off
1995 zone = &pgdat->node_zones[zoneid]; in fragmentation_score_node()
2011 wmark_low = max(100U - sysctl_compaction_proactiveness, 5U); in fragmentation_score_wmark()
2029 const int migratetype = cc->migratetype; in __compact_finished()
2035 reset_cached_positions(cc->zone); in __compact_finished()
2043 if (cc->direct_compaction) in __compact_finished()
2044 cc->zone->compact_blockskip_flush = true; in __compact_finished()
2046 if (cc->whole_zone) in __compact_finished()
2052 if (cc->proactive_compaction) { in __compact_finished()
2056 pgdat = cc->zone->zone_pgdat; in __compact_finished()
2060 score = fragmentation_score_zone(cc->zone); in __compact_finished()
2071 if (is_via_compact_memory(cc->order)) in __compact_finished()
2080 if (!IS_ALIGNED(cc->migrate_pfn, pageblock_nr_pages)) in __compact_finished()
2085 for (order = cc->order; order < MAX_ORDER; order++) { in __compact_finished()
2086 struct free_area *area = &cc->zone->free_area[order]; in __compact_finished()
2104 true, &can_steal) != -1) { in __compact_finished()
2111 * We are stealing for a non-movable allocation. Make in __compact_finished()
2118 if (cc->mode == MIGRATE_ASYNC || in __compact_finished()
2119 IS_ALIGNED(cc->migrate_pfn, in __compact_finished()
2130 if (cc->contended || fatal_signal_pending(current)) in __compact_finished()
2141 trace_mm_compaction_finished(cc->zone, cc->order, ret); in compact_finished()
2160 * If watermarks for high-order allocation are already met, there in __compaction_suitable()
2168 * Watermarks for order-0 must be met for compaction to be able to in __compaction_suitable()
2194 * COMPACT_SKIPPED - If there are too few free pages for compaction
2195 * COMPACT_SUCCESS - If the allocation would succeed without compaction
2196 * COMPACT_CONTINUE - If compaction should run now
2211 * index of -1000 would imply allocations might succeed depending on in compaction_suitable()
2212 * watermarks, but we already failed the high-order watermark check in compaction_suitable()
2217 * ignore fragindex for non-costly orders where the alternative to in compaction_suitable()
2246 for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, in compaction_zonelist_suitable()
2247 ac->highest_zoneidx, ac->nodemask) { in compaction_zonelist_suitable()
2260 ac->highest_zoneidx, available); in compaction_zonelist_suitable()
2272 unsigned long start_pfn = cc->zone->zone_start_pfn; in compact_zone()
2273 unsigned long end_pfn = zone_end_pfn(cc->zone); in compact_zone()
2275 const bool sync = cc->mode != MIGRATE_ASYNC; in compact_zone()
2282 cc->total_migrate_scanned = 0; in compact_zone()
2283 cc->total_free_scanned = 0; in compact_zone()
2284 cc->nr_migratepages = 0; in compact_zone()
2285 cc->nr_freepages = 0; in compact_zone()
2286 INIT_LIST_HEAD(&cc->freepages); in compact_zone()
2287 INIT_LIST_HEAD(&cc->migratepages); in compact_zone()
2289 cc->migratetype = gfp_migratetype(cc->gfp_mask); in compact_zone()
2290 ret = compaction_suitable(cc->zone, cc->order, cc->alloc_flags, in compact_zone()
2291 cc->highest_zoneidx); in compact_zone()
2303 if (compaction_restarting(cc->zone, cc->order)) in compact_zone()
2304 __reset_isolation_suitable(cc->zone); in compact_zone()
2312 cc->fast_start_pfn = 0; in compact_zone()
2313 if (cc->whole_zone) { in compact_zone()
2314 cc->migrate_pfn = start_pfn; in compact_zone()
2315 cc->free_pfn = pageblock_start_pfn(end_pfn - 1); in compact_zone()
2317 cc->migrate_pfn = cc->zone->compact_cached_migrate_pfn[sync]; in compact_zone()
2318 cc->free_pfn = cc->zone->compact_cached_free_pfn; in compact_zone()
2319 if (cc->free_pfn < start_pfn || cc->free_pfn >= end_pfn) { in compact_zone()
2320 cc->free_pfn = pageblock_start_pfn(end_pfn - 1); in compact_zone()
2321 cc->zone->compact_cached_free_pfn = cc->free_pfn; in compact_zone()
2323 if (cc->migrate_pfn < start_pfn || cc->migrate_pfn >= end_pfn) { in compact_zone()
2324 cc->migrate_pfn = start_pfn; in compact_zone()
2325 cc->zone->compact_cached_migrate_pfn[0] = cc->migrate_pfn; in compact_zone()
2326 cc->zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn; in compact_zone()
2329 if (cc->migrate_pfn <= cc->zone->compact_init_migrate_pfn) in compact_zone()
2330 cc->whole_zone = true; in compact_zone()
2344 cc->zone->compact_cached_migrate_pfn[0] == cc->zone->compact_cached_migrate_pfn[1]; in compact_zone()
2346 trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, in compact_zone()
2347 cc->free_pfn, end_pfn, sync); in compact_zone()
2354 unsigned long iteration_start_pfn = cc->migrate_pfn; in compact_zone()
2364 cc->rescan = false; in compact_zone()
2367 cc->rescan = true; in compact_zone()
2373 putback_movable_pages(&cc->migratepages); in compact_zone()
2374 cc->nr_migratepages = 0; in compact_zone()
2378 cc->zone->compact_cached_migrate_pfn[1] = in compact_zone()
2379 cc->zone->compact_cached_migrate_pfn[0]; in compact_zone()
2385 * previous cc->order aligned block. in compact_zone()
2393 err = migrate_pages(&cc->migratepages, compaction_alloc, in compact_zone()
2394 compaction_free, (unsigned long)cc, cc->mode, in compact_zone()
2397 trace_mm_compaction_migratepages(cc->nr_migratepages, err, in compact_zone()
2398 &cc->migratepages); in compact_zone()
2401 cc->nr_migratepages = 0; in compact_zone()
2403 putback_movable_pages(&cc->migratepages); in compact_zone()
2405 * migrate_pages() may return -ENOMEM when scanners meet in compact_zone()
2408 if (err == -ENOMEM && !compact_scanners_met(cc)) { in compact_zone()
2414 * order-aligned block, so skip the rest of it. in compact_zone()
2416 if (cc->direct_compaction && in compact_zone()
2417 (cc->mode == MIGRATE_ASYNC)) { in compact_zone()
2418 cc->migrate_pfn = block_end_pfn( in compact_zone()
2419 cc->migrate_pfn - 1, cc->order); in compact_zone()
2428 * cc->order aligned block where we migrated from? If yes, in compact_zone()
2433 if (cc->order > 0 && last_migrated_pfn) { in compact_zone()
2435 block_start_pfn(cc->migrate_pfn, cc->order); in compact_zone()
2438 lru_add_drain_cpu_zone(cc->zone); in compact_zone()
2445 if (capc && capc->page) { in compact_zone()
2456 if (cc->nr_freepages > 0) { in compact_zone()
2457 unsigned long free_pfn = release_freepages(&cc->freepages); in compact_zone()
2459 cc->nr_freepages = 0; in compact_zone()
2467 if (free_pfn > cc->zone->compact_cached_free_pfn) in compact_zone()
2468 cc->zone->compact_cached_free_pfn = free_pfn; in compact_zone()
2471 count_compact_events(COMPACTMIGRATE_SCANNED, cc->total_migrate_scanned); in compact_zone()
2472 count_compact_events(COMPACTFREE_SCANNED, cc->total_free_scanned); in compact_zone()
2474 trace_mm_compaction_end(start_pfn, cc->migrate_pfn, in compact_zone()
2475 cc->free_pfn, end_pfn, sync, ret); in compact_zone()
2511 WRITE_ONCE(current->capture_control, &capc); in compact_zone_order()
2523 WRITE_ONCE(current->capture_control, NULL); in compact_zone_order()
2540 * try_to_compact_pages - Direct compact to satisfy a high-order allocation
2560 * Check if the GFP flags allow compaction - GFP_NOIO is really in try_to_compact_pages()
2569 for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, in try_to_compact_pages()
2570 ac->highest_zoneidx, ac->nodemask) { in try_to_compact_pages()
2580 alloc_flags, ac->highest_zoneidx, capture); in try_to_compact_pages()
2624 * due to various back-off conditions, such as, contention on per-node or
2625 * per-zone locks.
2632 .order = -1, in proactive_compact_node()
2641 zone = &pgdat->node_zones[zoneid]; in proactive_compact_node()
2661 .order = -1, in compact_node()
2671 zone = &pgdat->node_zones[zoneid]; in compact_node()
2716 if (pgdat->proactive_compact_trigger) in compaction_proactiveness_sysctl_handler()
2719 pgdat->proactive_compact_trigger = true; in compaction_proactiveness_sysctl_handler()
2720 wake_up_interruptible(&pgdat->kcompactd_wait); in compaction_proactiveness_sysctl_handler()
2745 int nid = dev->id; in compact_store()
2760 return device_create_file(&node->dev, &dev_attr_compact); in compaction_register_node()
2765 return device_remove_file(&node->dev, &dev_attr_compact); in compaction_unregister_node()
2771 return pgdat->kcompactd_max_order > 0 || kthread_should_stop() || in kcompactd_work_requested()
2772 pgdat->proactive_compact_trigger; in kcompactd_work_requested()
2779 enum zone_type highest_zoneidx = pgdat->kcompactd_highest_zoneidx; in kcompactd_node_suitable()
2782 zone = &pgdat->node_zones[zoneid]; in kcompactd_node_suitable()
2787 if (compaction_suitable(zone, pgdat->kcompactd_max_order, 0, in kcompactd_node_suitable()
2804 .order = pgdat->kcompactd_max_order, in kcompactd_do_work()
2805 .search_order = pgdat->kcompactd_max_order, in kcompactd_do_work()
2806 .highest_zoneidx = pgdat->kcompactd_highest_zoneidx, in kcompactd_do_work()
2811 trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.order, in kcompactd_do_work()
2818 zone = &pgdat->node_zones[zoneid]; in kcompactd_do_work()
2867 if (pgdat->kcompactd_max_order <= cc.order) in kcompactd_do_work()
2868 pgdat->kcompactd_max_order = 0; in kcompactd_do_work()
2869 if (pgdat->kcompactd_highest_zoneidx >= cc.highest_zoneidx) in kcompactd_do_work()
2870 pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1; in kcompactd_do_work()
2878 if (pgdat->kcompactd_max_order < order) in wakeup_kcompactd()
2879 pgdat->kcompactd_max_order = order; in wakeup_kcompactd()
2881 if (pgdat->kcompactd_highest_zoneidx > highest_zoneidx) in wakeup_kcompactd()
2882 pgdat->kcompactd_highest_zoneidx = highest_zoneidx; in wakeup_kcompactd()
2888 if (!wq_has_sleeper(&pgdat->kcompactd_wait)) in wakeup_kcompactd()
2894 trace_mm_compaction_wakeup_kcompactd(pgdat->node_id, order, in wakeup_kcompactd()
2896 wake_up_interruptible(&pgdat->kcompactd_wait); in wakeup_kcompactd()
2910 const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); in kcompactd()
2917 pgdat->kcompactd_max_order = 0; in kcompactd()
2918 pgdat->kcompactd_highest_zoneidx = pgdat->nr_zones - 1; in kcompactd()
2929 trace_mm_compaction_kcompactd_sleep(pgdat->node_id); in kcompactd()
2930 if (wait_event_freezable_timeout(pgdat->kcompactd_wait, in kcompactd()
2932 !pgdat->proactive_compact_trigger) { in kcompactd()
2967 if (unlikely(pgdat->proactive_compact_trigger)) in kcompactd()
2968 pgdat->proactive_compact_trigger = false; in kcompactd()
2975 * This kcompactd start function will be called by init and node-hot-add.
2976 * On node-hot-add, kcompactd will moved to proper cpus if cpus are hot-added.
2983 if (pgdat->kcompactd) in kcompactd_run()
2986 pgdat->kcompactd = kthread_run(kcompactd, pgdat, "kcompactd%d", nid); in kcompactd_run()
2987 if (IS_ERR(pgdat->kcompactd)) { in kcompactd_run()
2989 ret = PTR_ERR(pgdat->kcompactd); in kcompactd_run()
2990 pgdat->kcompactd = NULL; in kcompactd_run()
3001 struct task_struct *kcompactd = NODE_DATA(nid)->kcompactd; in kcompactd_stop()
3005 NODE_DATA(nid)->kcompactd = NULL; in kcompactd_stop()
3023 mask = cpumask_of_node(pgdat->node_id); in kcompactd_cpu_online()
3027 set_cpus_allowed_ptr(pgdat->kcompactd, mask); in kcompactd_cpu_online()