Index: mm/page_alloc.c
===================================================================
--- mm/page_alloc.c	(revision 2645)
+++ mm/page_alloc.c	(working copy)
@@ -892,6 +892,9 @@ failed:
 #define ALLOC_HARDER		0x10 /* try to alloc harder */
 #define ALLOC_HIGH		0x20 /* __GFP_HIGH set */
 #define ALLOC_CPUSET		0x40 /* check for correct cpuset */
+#define ALLOC_PAGECACHE		0x80 /* __GFP_PAGECACHE set */
+
+#define VFS_CACHE_LIMIT		0x400 /* limit VFS cache page */
 
 /*
  * Return 1 if free pages are above 'mark'. This takes into account the order
@@ -910,6 +913,10 @@ int zone_watermark_ok(struct zone *z, in
 	if (alloc_flags & ALLOC_HARDER)
 		min -= min / 4;
 
+	if (alloc_flags & ALLOC_PAGECACHE){
+		min = min + VFS_CACHE_LIMIT;
+	}
+
 	if (free_pages <= min + z->lowmem_reserve[classzone_idx])
 		return 0;
 	for (o = 0; o < order; o++) {
@@ -1000,8 +1007,12 @@ restart:
 		return NULL;
 	}
 
-	page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
-				zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET);
+	if (gfp_mask & __GFP_PAGECACHE)	
+		page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
+			zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET|ALLOC_PAGECACHE);
+	else
+		page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, order,
+					zonelist, ALLOC_WMARK_LOW|ALLOC_CPUSET);
 	if (page)
 		goto got_pg;
 
@@ -1027,6 +1038,9 @@ restart:
 	if (wait)
 		alloc_flags |= ALLOC_CPUSET;
 
+	if (gfp_mask & __GFP_PAGECACHE)
+		alloc_flags |= ALLOC_PAGECACHE;
+
 	/*
 	 * Go through the zonelist again. Let __GFP_HIGH and allocations
 	 * coming from realtime tasks go deeper into reserves.
Index: include/linux/gfp.h
===================================================================
--- include/linux/gfp.h	(revision 2645)
+++ include/linux/gfp.h	(working copy)
@@ -46,6 +46,7 @@ struct vm_area_struct;
 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
 #define __GFP_HARDWALL   ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
 #define __GFP_THISNODE	((__force gfp_t)0x40000u)/* No fallback, no policies */
+#define __GFP_PAGECACHE	((__force gfp_t)0x80000u) /* Is page cache allocation ? */
 
 #define __GFP_BITS_SHIFT 20	/* Room for 20 __GFP_FOO bits */
 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
Index: include/linux/pagemap.h
===================================================================
--- include/linux/pagemap.h	(revision 2645)
+++ include/linux/pagemap.h	(working copy)
@@ -62,7 +62,7 @@ static inline struct page *__page_cache_
 
 static inline struct page *page_cache_alloc(struct address_space *x)
 {
-	return __page_cache_alloc(mapping_gfp_mask(x));
+	return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_PAGECACHE);
 }
 
 static inline struct page *page_cache_alloc_cold(struct address_space *x)