439  * If no pages were isolated then mark this pageblock to be skipped in the
572 		int isolated;  in isolate_freepages_block()  local
624 		isolated = __isolate_free_page(page, order);  in isolate_freepages_block()
625 		if (!isolated)  in isolate_freepages_block()
629 		total_isolated += isolated;  in isolate_freepages_block()
630 		cc->nr_freepages += isolated;  in isolate_freepages_block()
634 			blockpfn += isolated;  in isolate_freepages_block()
638 		blockpfn += isolated - 1;  in isolate_freepages_block()
639 		cursor += isolated - 1;  in isolate_freepages_block()
668 	 * pages requested were isolated. If there were any failures, 0 is  in isolate_freepages_block()
690  * Otherwise, function returns one-past-the-last PFN of isolated page
698 	unsigned long isolated, pfn, block_start_pfn, block_end_pfn;  in isolate_freepages_range()  local
707 	for (; pfn < end_pfn; pfn += isolated,  in isolate_freepages_range()
716 		 * pfn could pass the block_end_pfn if isolated freepage  in isolate_freepages_range()
730 		isolated = isolate_freepages_block(cc, &isolate_start_pfn,  in isolate_freepages_range()
738 		if (!isolated)  in isolate_freepages_range()
764 	unsigned long active, inactive, isolated;  in too_many_isolated()  local
770 	isolated = node_page_state(pgdat, NR_ISOLATED_FILE) +  in too_many_isolated()
773 	return isolated > (inactive + active) / 2;  in too_many_isolated()
790  * The pages are isolated on cc->migratepages list (not required to be empty),
812 	 * Ensure that there are not too many pages isolated from the LRU  in isolate_migratepages_block()
814 	 * delay for some time until fewer pages are isolated  in isolate_migratepages_block()
843 			 * We have isolated all migration candidates in the  in isolate_migratepages_block()
920 				 * Hugepage was successfully isolated and placed  in isolate_migratepages_block()
930 			 * isolated. Fall-through as the check below handles  in isolate_migratepages_block()
1060 		/* Successfully isolated */  in isolate_migratepages_block()
1099 		 * We have isolated some pages, but then failed. Release them  in isolate_migratepages_block()
1148 	 * there were no pages isolated in the block or if the block is  in isolate_migratepages_block()
1553 	 * successfully isolated from, zone-cached value, or the end of the  in isolate_freepages()
1572 	 * and free page scanners meet or enough free pages are isolated.  in isolate_freepages()
1608 		/* Are enough freepages isolated? */  in isolate_freepages()
1613 				 * freepages can be isolated next time.  in isolate_freepages()
1650  * from the isolated freelists in the block we are migrating to.
1673  * This is a migrate-callback that "frees" freepages back to the isolated
1688 	ISOLATE_NONE,		/* No pages isolated, continue scanning */
1689 	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
1929 		 * Either we isolated something and proceed with migration. Or  in isolate_migratepages()
2358 		 * isolated (dirty/writeback in async mode) or if the migrated  in compact_zone()
2383 			 * We haven't isolated and migrated anything, but  in compact_zone()