Merge "mm: vmscan: scan until it finds eligible pages"

 *

 * Appropriate locks must be held before calling this function.

 *

 * @nr_to_scan:	The number of pages to look through on the list.

 * @nr_to_scan:	The number of eligible pages to look through on the list.

 * @lruvec:	The LRU vector to pull pages from.

 * @dst:	The temp list to put pages on to.

 * @nr_scanned:	The number of pages that were scanned.

	unsigned long nr_zone_taken[MAX_NR_ZONES] = { 0 };

	unsigned long nr_skipped[MAX_NR_ZONES] = { 0, };

	unsigned long skipped = 0;

	unsigned long scan, nr_pages;

	unsigned long scan, total_scan, nr_pages;

	LIST_HEAD(pages_skipped);

	for (scan = 0; scan < nr_to_scan && nr_taken < nr_to_scan &&

					!list_empty(src); scan++) {

	scan = 0;

	for (total_scan = 0;

	     scan < nr_to_scan && nr_taken < nr_to_scan && !list_empty(src);

	     total_scan++) {

		struct page *page;

		page = lru_to_page(src);

			continue;

		}

		/*

		 * Do not count skipped pages because that makes the function

		 * return with no isolated pages if the LRU mostly contains

		 * ineligible pages.  This causes the VM to not reclaim any

		 * pages, triggering a premature OOM.

		 */

		scan++;

		switch (__isolate_lru_page(page, mode)) {

		case 0:

			nr_pages = hpage_nr_pages(page);

			skipped += nr_skipped[zid];

		}

	}

	*nr_scanned = scan;

	*nr_scanned = total_scan;

	trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, nr_to_scan,

				    scan, skipped, nr_taken, mode,

					total_scan, skipped, nr_taken, mode,

					is_file_lru(lru));

	update_lru_sizes(lruvec, lru, nr_zone_taken);

	return nr_taken;