[patch 09/21] (NEW) improve reclaim balancing

[Rik van Riel]

- deactivate anonymous pages regardless of the scan ratio
- go through the reclaim loop at least once for the deactivation
- break out of the reclaim loop if we freed sc->swap_cluster_max pages,
  on big systems the nr[FOO] targets can get ridiculously large

Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>

Index: linux-2.6.25-rc2-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.25-rc2-mm1.orig/mm/vmscan.c	2008-02-28 00:29:40.000000000 -0500
+++ linux-2.6.25-rc2-mm1/mm/vmscan.c	2008-02-28 00:29:46.000000000 -0500
@@ -1302,7 +1302,7 @@ static unsigned long shrink_zone(int pri
 	}
 
 	while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
-						 nr[LRU_INACTIVE_FILE]) {
+					nr[LRU_INACTIVE_FILE]) {
 		for_each_lru(l) {
 			if (nr[l]) {
 				nr_to_scan = min(nr[l],
@@ -1315,6 +1315,14 @@ static unsigned long shrink_zone(int pri
 		}
 	}
 
+	/*
+	 * 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_low(zone))
+		shrink_list(NR_ACTIVE_ANON, SWAP_CLUSTER_MAX, zone, sc,
+								priority);
+
 	throttle_vm_writeout(sc->gfp_mask);
 	return nr_reclaimed;
 }

-- 
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