diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 59fac1a..05c6524 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -242,6 +242,7 @@
 	block_t nat_blkaddr;		/* base disk address of NAT */
 	nid_t max_nid;			/* maximum possible node ids */
 	nid_t next_scan_nid;		/* the next nid to be scanned */
+	unsigned int ram_thresh;	/* control the memory footprint */
 
 	/* NAT cache management */
 	struct radix_tree_root nat_root;/* root of the nat entry cache */
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d27e65a..fec4967 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -26,6 +26,22 @@
 static struct kmem_cache *nat_entry_slab;
 static struct kmem_cache *free_nid_slab;
 
+static inline bool available_free_memory(struct f2fs_nm_info *nm_i, int type)
+{
+	struct sysinfo val;
+	unsigned long mem_size = 0;
+
+	si_meminfo(&val);
+	if (type == FREE_NIDS)
+		mem_size = nm_i->fcnt * sizeof(struct free_nid);
+	else if (type == NAT_ENTRIES)
+		mem_size += nm_i->nat_cnt * sizeof(struct nat_entry);
+	mem_size >>= 12;
+
+	/* give 50:50 memory for free nids and nat caches respectively */
+	return (mem_size < ((val.totalram * nm_i->ram_thresh) >> 11));
+}
+
 static void clear_node_page_dirty(struct page *page)
 {
 	struct address_space *mapping = page->mapping;
@@ -208,7 +224,7 @@
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 
-	if (nm_i->nat_cnt <= NM_WOUT_THRESHOLD || nr_shrink <= 0)
+	if (available_free_memory(nm_i, NAT_ENTRIES) || nr_shrink <= 0)
 		return 0;
 
 	write_lock(&nm_i->nat_tree_lock);
@@ -1288,7 +1304,7 @@
 	struct nat_entry *ne;
 	bool allocated = false;
 
-	if (nm_i->fcnt > 2 * MAX_FREE_NIDS)
+	if (!available_free_memory(nm_i, FREE_NIDS))
 		return -1;
 
 	/* 0 nid should not be used */
@@ -1473,7 +1489,7 @@
 	spin_lock(&nm_i->free_nid_list_lock);
 	i = __lookup_free_nid_list(nm_i, nid);
 	f2fs_bug_on(!i || i->state != NID_ALLOC);
-	if (nm_i->fcnt > 2 * MAX_FREE_NIDS) {
+	if (!available_free_memory(nm_i, FREE_NIDS)) {
 		__del_from_free_nid_list(nm_i, i);
 	} else {
 		i->state = NID_NEW;
@@ -1836,6 +1852,7 @@
 	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks - 3;
 	nm_i->fcnt = 0;
 	nm_i->nat_cnt = 0;
+	nm_i->ram_thresh = DEF_RAM_THRESHOLD;
 
 	INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
 	INIT_LIST_HEAD(&nm_i->free_nid_list);
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index ee6d286..c972154 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -17,15 +17,15 @@
 /* # of pages to perform readahead before building free nids */
 #define FREE_NID_PAGES 4
 
-/* maximum # of free node ids to produce during build_free_nids */
-#define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES)
-
 /* maximum readahead size for node during getting data blocks */
 #define MAX_RA_NODE		128
 
 /* maximum cached nat entries to manage memory footprint */
 #define NM_WOUT_THRESHOLD	(64 * NAT_ENTRY_PER_BLOCK)
 
+/* control the memory footprint threshold (10MB per 1GB ram) */
+#define DEF_RAM_THRESHOLD	10
+
 /* vector size for gang look-up from nat cache that consists of radix tree */
 #define NATVEC_SIZE	64
 
@@ -77,6 +77,11 @@
 	ni->version = raw_ne->version;
 }
 
+enum nid_type {
+	FREE_NIDS,	/* indicates the free nid list */
+	NAT_ENTRIES	/* indicates the cached nat entry */
+};
+
 /*
  * For free nid mangement
  */
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index dbe402b..34c47b2 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -74,6 +74,7 @@
 enum {
 	GC_THREAD,	/* struct f2fs_gc_thread */
 	SM_INFO,	/* struct f2fs_sm_info */
+	NM_INFO,	/* struct f2fs_nm_info */
 	F2FS_SBI,	/* struct f2fs_sb_info */
 };
 
@@ -92,6 +93,8 @@
 		return (unsigned char *)sbi->gc_thread;
 	else if (struct_type == SM_INFO)
 		return (unsigned char *)SM_I(sbi);
+	else if (struct_type == NM_INFO)
+		return (unsigned char *)NM_I(sbi);
 	else if (struct_type == F2FS_SBI)
 		return (unsigned char *)sbi;
 	return NULL;
@@ -183,6 +186,7 @@
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
+F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 
@@ -198,6 +202,7 @@
 	ATTR_LIST(min_ipu_util),
 	ATTR_LIST(max_victim_search),
 	ATTR_LIST(dir_level),
+	ATTR_LIST(ram_thresh),
 	NULL,
 };