[RFC} memory unplug patchset prep [5/16] GFP_MOVABLE

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Add GFP_MOVABLE support

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 include/linux/gfp.h |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: devel-tree-2.6.20-mm2/include/linux/gfp.h
===================================================================
--- devel-tree-2.6.20-mm2.orig/include/linux/gfp.h
+++ devel-tree-2.6.20-mm2/include/linux/gfp.h
@@ -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_MOVABLE	((__force gfp_t)0x80000u) /* Movable page allocation */
 
 #define __GFP_BITS_SHIFT 20	/* Room for 20 __GFP_FOO bits */
 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
@@ -54,7 +55,7 @@ struct vm_area_struct;
 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
 			__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
 			__GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
-			__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE)
+			__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE | __GFP_MOVABLE)
 
 /* This equals 0, but use constants in case they ever change */
 #define GFP_NOWAIT	(GFP_ATOMIC & ~__GFP_HIGH)
@@ -66,6 +67,8 @@ struct vm_area_struct;
 #define GFP_USER	(__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
 #define GFP_HIGHUSER	(__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
 			 __GFP_HIGHMEM)
+#define GFP_HIGH_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
+			 __GFP_HIGHMEM | __GFP_MOVABLE)
 
 #ifdef CONFIG_NUMA
 #define GFP_THISNODE	(__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
@@ -93,6 +96,10 @@ static inline enum zone_type gfp_zone(gf
 	if (flags & __GFP_DMA32)
 		return ZONE_DMA32;
 #endif
+#ifdef CONFIG_ZONE_MOVABLE
+	if (flags & __GFP_MOVABLE) /* we can try to alloc movable pages. */
+		return ZONE_MOVABLE;
+#endif
 #ifdef CONFIG_HIGHMEM
 	if (flags & __GFP_HIGHMEM)
 		return ZONE_HIGHMEM;

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