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Commit 80e43426 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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[PATCH] zone reclaim: do not check references to a page during zone reclaim 



shrink_list() and refill_inactive() check all ptes pointing to a page for
reference bits in order to decide if the page should be put on the active
list.  This is not necessary for zone_reclaim since we are only interested
in removing unmapped pages.  Skip the checks in both functions.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 643a6545

mm/vmscan.c

+5 −1
Original line number Diff line number Diff line
@@ -443,6 +443,10 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc) 
		BUG_ON(PageActive(page));



		sc->nr_scanned++;



		if (!sc->may_swap && page_mapped(page))

			goto keep_locked;



		/* Double the slab pressure for mapped and swapcache pages */

		if (page_mapped(page) || PageSwapCache(page))

			sc->nr_scanned++;
@@ -1231,7 +1235,7 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc) 
	 * Now use this metric to decide whether to start moving mapped memory

	 * onto the inactive list.

	 */

	if (swap_tendency >= 100)

	if (swap_tendency >= 100 && sc->may_swap)

		reclaim_mapped = 1;



	while (!list_empty(&l_hold)) {