[PATCH 01/16] mm: restore sc.nr_to_reclaim

[Wu Fengguang <wfg@mail.ustc.edu.cn>]

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Keep it before the real fine grained scan patch is ready :)

The following patches really needs small scan quantities, at least in
normal situation.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
---

 mm/vmscan.c |    8 ++++++++
 1 files changed, 8 insertions(+)

--- linux.orig/mm/vmscan.c
+++ linux/mm/vmscan.c
@@ -63,6 +63,9 @@ struct scan_control {
 
 	unsigned long nr_mapped;	/* From page_state */
 
+	/* How many pages shrink_cache() should reclaim */
+	int nr_to_reclaim;
+
 	/* Ask shrink_caches, or shrink_zone to scan at this priority */
 	unsigned int priority;
 
@@ -898,6 +901,7 @@ static void shrink_cache(struct zone *zo
 		if (current_is_kswapd())
 			mod_page_state(kswapd_steal, nr_freed);
 		mod_page_state_zone(zone, pgsteal, nr_freed);
+		sc->nr_to_reclaim -= nr_freed;
 
 		spin_lock_irq(&zone->lru_lock);
 		/*
@@ -1097,6 +1101,8 @@ shrink_zone(struct zone *zone, struct sc
 	else
 		nr_inactive = 0;
 
+	sc->nr_to_reclaim = sc->swap_cluster_max;
+
 	while (nr_active || nr_inactive) {
 		if (nr_active) {
 			sc->nr_to_scan = min(nr_active,
@@ -1110,6 +1116,8 @@ shrink_zone(struct zone *zone, struct sc
 					(unsigned long)sc->swap_cluster_max);
 			nr_inactive -= sc->nr_to_scan;
 			shrink_cache(zone, sc);
+			if (sc->nr_to_reclaim <= 0)
+				break;
 		}
 	}
 

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