480  * If no pages were isolated then mark this pageblock to be skipped in the
605 		int isolated;  in isolate_freepages_block()  local
652 		isolated = __isolate_free_page(page, order);  in isolate_freepages_block()
653 		if (!isolated)  in isolate_freepages_block()
657 		nr_scanned += isolated - 1;  in isolate_freepages_block()
658 		total_isolated += isolated;  in isolate_freepages_block()
659 		cc->nr_freepages += isolated;  in isolate_freepages_block()
663 			blockpfn += isolated;  in isolate_freepages_block()
667 		blockpfn += isolated - 1;  in isolate_freepages_block()
668 		page += isolated - 1;  in isolate_freepages_block()
694 	 * pages requested were isolated. If there were any failures, 0 is  in isolate_freepages_block()
716  * Otherwise, function returns one-past-the-last PFN of isolated page
724 	unsigned long isolated, pfn, block_start_pfn, block_end_pfn;  in isolate_freepages_range()  local
733 	for (; pfn < end_pfn; pfn += isolated,  in isolate_freepages_range()
740 		 * pfn could pass the block_end_pfn if isolated freepage  in isolate_freepages_range()
755 		isolated = isolate_freepages_block(cc, &isolate_start_pfn,  in isolate_freepages_range()
763 		if (!isolated)  in isolate_freepages_range()
792 	unsigned long active, inactive, isolated;  in too_many_isolated()  local
798 	isolated = node_page_state(pgdat, NR_ISOLATED_FILE) +  in too_many_isolated()
804 	 * compactors have already isolated to the limit, but are  in too_many_isolated()
812 	too_many = isolated > (inactive + active) / 2;  in too_many_isolated()
833  * The pages are isolated on cc->migratepages list (not required to be empty),
857 	 * Ensure that there are not too many pages isolated from the LRU  in isolate_migratepages_block()
859 	 * delay for some time until fewer pages are isolated  in isolate_migratepages_block()
889 			 * We have isolated all migration candidates in the  in isolate_migratepages_block()
973 				 * Hugepage was successfully isolated and placed  in isolate_migratepages_block()
984 			 * isolated. Fall-through as the check below handles  in isolate_migratepages_block()
1183 		/* Successfully isolated */  in isolate_migratepages_block()
1223 		 * We have isolated some pages, but then failed. Release them  in isolate_migratepages_block()
1272 	 * there were no pages isolated in the block or if the block is  in isolate_migratepages_block()
1601 		/* Skip fast search if enough freepages isolated */  in fast_isolate_freepages()
1677 	 * successfully isolated from, zone-cached value, or the end of the  in isolate_freepages()
1696 	 * and free page scanners meet or enough free pages are isolated.  in isolate_freepages()
1740 		/* Are enough freepages isolated? */  in isolate_freepages()
1745 				 * freepages can be isolated next time.  in isolate_freepages()
1782  * from the isolated freelists in the block we are migrating to.
1804  * This is a migrate-callback that "frees" freepages back to the isolated
1819 	ISOLATE_NONE,		/* No pages isolated, continue scanning */
1820 	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
2079 		 * Either we isolated something and proceed with migration. Or  in isolate_migratepages()
2517 		 * happen if a page cannot be isolated (dirty/writeback in  in compact_zone()
2543 			 * We haven't isolated and migrated anything, but  in compact_zone()