---

yaml
---
r: 164388
b: refs/heads/master
c: 35cd781
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a731286de62294b63d8ceb3c5914ac52cc17e690
+refs/heads/master: 35cd78156c499ef83f60605e4643d5a98fef14fd

trunk/mm/vmscan.c

@@ -1033,6 +1033,31 @@ int isolate_lru_page(struct page *page)
 	return ret;
 }
 
+/*
+ * Are there way too many processes in the direct reclaim path already?
+ */
+static int too_many_isolated(struct zone *zone, int file,
+		struct scan_control *sc)
+{
+	unsigned long inactive, isolated;
+
+	if (current_is_kswapd())
+		return 0;
+
+	if (!scanning_global_lru(sc))
+		return 0;
+
+	if (file) {
+		inactive = zone_page_state(zone, NR_INACTIVE_FILE);
+		isolated = zone_page_state(zone, NR_ISOLATED_FILE);
+	} else {
+		inactive = zone_page_state(zone, NR_INACTIVE_ANON);
+		isolated = zone_page_state(zone, NR_ISOLATED_ANON);
+	}
+
+	return isolated > inactive;
+}
+
 /*
  * shrink_inactive_list() is a helper for shrink_zone().  It returns the number
  * of reclaimed pages
@@ -1048,6 +1073,14 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
 	struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
 	int lumpy_reclaim = 0;
 
+	while (unlikely(too_many_isolated(zone, file, sc))) {
+		congestion_wait(WRITE, HZ/10);
+
+		/* We are about to die and free our memory. Return now. */
+		if (fatal_signal_pending(current))
+			return SWAP_CLUSTER_MAX;
+	}
+
 	/*
 	 * If we need a large contiguous chunk of memory, or have
 	 * trouble getting a small set of contiguous pages, we