288  * If no pages were isolated then mark this pageblock to be skipped in the
450 		int isolated;  in isolate_freepages_block()  local
517 		isolated = __isolate_free_page(page, order);  in isolate_freepages_block()
518 		if (!isolated)  in isolate_freepages_block()
522 		total_isolated += isolated;  in isolate_freepages_block()
523 		cc->nr_freepages += isolated;  in isolate_freepages_block()
527 			blockpfn += isolated;  in isolate_freepages_block()
531 		blockpfn += isolated - 1;  in isolate_freepages_block()
532 		cursor += isolated - 1;  in isolate_freepages_block()
561 	 * pages requested were isolated. If there were any failures, 0 is  in isolate_freepages_block()
587  * Otherwise, function returns one-past-the-last PFN of isolated page
595 	unsigned long isolated, pfn, block_start_pfn, block_end_pfn;  in isolate_freepages_range()  local
604 	for (; pfn < end_pfn; pfn += isolated,  in isolate_freepages_range()
613 		 * pfn could pass the block_end_pfn if isolated freepage  in isolate_freepages_range()
627 		isolated = isolate_freepages_block(cc, &isolate_start_pfn,  in isolate_freepages_range()
635 		if (!isolated)  in isolate_freepages_range()
661 	unsigned long active, inactive, isolated;  in too_many_isolated()  local
667 	isolated = node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE) +  in too_many_isolated()
670 	return isolated > (inactive + active) / 2;  in too_many_isolated()
687  * The pages are isolated on cc->migratepages list (not required to be empty),
706 	 * Ensure that there are not too many pages isolated from the LRU  in isolate_migratepages_block()
708 	 * delay for some time until fewer pages are isolated  in isolate_migratepages_block()
734 			 * We have isolated all migration candidates in the  in isolate_migratepages_block()
878 		/* Successfully isolated */  in isolate_migratepages_block()
891 		 * - this is the lowest page that was isolated and likely be  in isolate_migratepages_block()
909 		 * We have isolated some pages, but then failed. Release them  in isolate_migratepages_block()
968  * Otherwise, function returns one-past-the-last PFN of isolated page
1078 	 * successfully isolated from, zone-cached value, or the end of the  in isolate_freepages()
1096 	 * and free page scanners meet or enough free pages are isolated.  in isolate_freepages()
1129 		 * If we isolated enough freepages, or aborted due to lock  in isolate_freepages()
1137 				 * freepages can be isolated next time.  in isolate_freepages()
1166  * from the isolated freelists in the block we are migrating to.
1194  * This is a migrate-callback that "frees" freepages back to the isolated
1209 	ISOLATE_NONE,		/* No pages isolated, continue scanning */
1210 	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
1290 		 * Either we isolated something and proceed with migration. Or  in isolate_migratepages()
1615 			 * We haven't isolated and migrated anything, but  in compact_zone()