486  * If no pages were isolated then mark this pageblock to be skipped in the
611 		int isolated;  in isolate_freepages_block()  local
659 		isolated = __isolate_free_page(page, order);  in isolate_freepages_block()
660 		if (!isolated)  in isolate_freepages_block()
664 		nr_scanned += isolated - 1;  in isolate_freepages_block()
665 		total_isolated += isolated;  in isolate_freepages_block()
666 		cc->nr_freepages += isolated;  in isolate_freepages_block()
670 			blockpfn += isolated;  in isolate_freepages_block()
674 		blockpfn += isolated - 1;  in isolate_freepages_block()
675 		page += isolated - 1;  in isolate_freepages_block()
701 	 * pages requested were isolated. If there were any failures, 0 is  in isolate_freepages_block()
723  * Otherwise, function returns one-past-the-last PFN of isolated page
725  * a free page). cc->freepages[] contain free pages isolated.
731 	unsigned long isolated, pfn, block_start_pfn, block_end_pfn;  in isolate_freepages_range()  local
743 	for (; pfn < end_pfn; pfn += isolated,  in isolate_freepages_range()
750 		 * pfn could pass the block_end_pfn if isolated freepage  in isolate_freepages_range()
765 		isolated = isolate_freepages_block(cc, &isolate_start_pfn,  in isolate_freepages_range()
773 		if (!isolated)  in isolate_freepages_range()
799 	unsigned long active, inactive, isolated;  in too_many_isolated()  local
805 	isolated = node_page_state(pgdat, NR_ISOLATED_FILE) +  in too_many_isolated()
811 	 * compactors have already isolated to the limit, but are  in too_many_isolated()
819 	too_many = isolated > (inactive + active) / 2;  in too_many_isolated()
829  * @order:		to-be-isolated folio order
866  * The pages are isolated on cc->migratepages list (not required to be empty),
890 	 * Ensure that there are not too many pages isolated from the LRU  in isolate_migratepages_block()
892 	 * delay for some time until fewer pages are isolated  in isolate_migratepages_block()
922 			 * We have isolated all migration candidates in the  in isolate_migratepages_block()
1021 				 * Hugepage was successfully isolated and placed  in isolate_migratepages_block()
1032 			 * isolated. Fall-through as the check below handles  in isolate_migratepages_block()
1235 		/* Successfully isolated */  in isolate_migratepages_block()
1275 		 * We have isolated some pages, but then failed. Release them  in isolate_migratepages_block()
1324 	 * there were no pages isolated in the block or if the block is  in isolate_migratepages_block()
1655 		/* Skip fast search if enough freepages isolated */  in fast_isolate_freepages()
1730 	 * successfully isolated from, zone-cached value, or the end of the  in isolate_freepages()
1749 	 * and free page scanners meet or enough free pages are isolated.  in isolate_freepages()
1793 		/* Are enough freepages isolated? */  in isolate_freepages()
1798 				 * freepages can be isolated next time.  in isolate_freepages()
1831  * from the isolated freelists in the block we are migrating to.
1887  * This is a migrate-callback that "frees" freepages back to the isolated
1912 	ISOLATE_NONE,		/* No pages isolated, continue scanning */
1913 	ISOLATE_SUCCESS,	/* Pages isolated, migrate */
2172 		 * Either we isolated something and proceed with migration. Or  in isolate_migratepages()
2620 		 * happen if a page cannot be isolated (dirty/writeback in  in compact_zone()
2646 			 * We haven't isolated and migrated anything, but  in compact_zone()