Commit 69c85481 authored Jun 16, 2009 by MinChan Kim Committed by Linus Torvalds Jun 16, 2009

vmscan: prevent shrinking of active anon lru list in case of no swap space V3



shrink_zone() can deactivate active anon pages even if we don't have a
swap device.  Many embedded products don't have a swap device.  So the
deactivation of anon pages is unnecessary.

This patch prevents unnecessary deactivation of anon lru pages.  But, it
don't prevent aging of anon pages to swap out.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 35282a2d

mm/vmscan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1570,7 +1570,7 @@ static void shrink_zone(int priority, struct zone *zone,
		* Even if we did not try to evict anon pages at all, we want to
		* rebalance the anon lru active/inactive ratio.
		*/
		if (inactive_anon_is_low(zone, sc))
		if (inactive_anon_is_low(zone, sc) && nr_swap_pages > 0)
		shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);

		throttle_vm_writeout(sc->gfp_mask);