diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7687228..98380ec 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -29,6 +29,7 @@ extern unsigned long num_physpages;
 extern unsigned long totalram_pages;
 extern void * high_memory;
 extern int page_cluster;
+extern int min_filelist_kbytes;
 
 #ifdef CONFIG_SYSCTL
 extern int sysctl_legacy_va_layout;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 3a45c22..c61f0c9 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1320,6 +1320,14 @@ static struct ctl_table vm_table[] = {
 		.extra2		= &one,
 	},
 #endif
+	{
+		.procname       = "min_filelist_kbytes",
+		.data           = &min_filelist_kbytes,
+		.maxlen         = sizeof(min_filelist_kbytes),
+		.mode           = 0644,
+		.proc_handler   = &proc_dointvec,
+		.extra1         = &zero,
+	},
 
 /*
  * NOTE: do not add new entries to this table unless you have read
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c5dfabf..3b0e95d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -130,6 +130,11 @@ struct scan_control {
 int vm_swappiness = 60;
 long vm_total_pages;	/* The total number of pages which the VM controls */
 
+/* 
+ * Low watermark used to prevent fscache thrashing during low memory.
+ * 20M is a arbitrary value. We need more discussion.
+ */
+int min_filelist_kbytes = 1024 * 20;
 static LIST_HEAD(shrinker_list);
 static DECLARE_RWSEM(shrinker_rwsem);
 
@@ -1635,6 +1640,7 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
 	u64 fraction[2], denominator;
 	enum lru_list l;
 	int noswap = 0;
+	int low_pagecache = 0;
 
 	/* If we have no swap space, do not bother scanning anon pages. */
 	if (!sc->may_swap || (nr_swap_pages <= 0)) {
@@ -1651,6 +1657,7 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
 		zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
 
 	if (scanning_global_lru(sc)) {
+		unsigned long pagecache_threshold;
 		free  = zone_page_state(zone, NR_FREE_PAGES);
 		/* If we have very few page cache pages,
 		   force-scan anon pages. */
@@ -1660,6 +1667,10 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
 			denominator = 1;
 			goto out;
 		}
+
+		pagecache_threshold = min_filelist_kbytes >> (PAGE_SHIFT - 10);
+		if (file < pagecache_threshold)
+			low_pagecache = 1;
 	}
 
 	/*
@@ -1715,6 +1726,12 @@ out:
 		if (priority || noswap) {
 			scan >>= priority;
 			scan = div64_u64(scan * fraction[file], denominator);
+			/*
+			 * If the system has low page cache, we slow down 
+			 * scanning speed with 1/8 to protect working set.
+			 */
+			if (low_pagecache)
+				scan >>= 3;
 		}
 		nr[l] = nr_scan_try_batch(scan,
 					  &reclaim_stat->nr_saved_scan[l]);