Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo

[safe/jmp/linux-2.6] / include / linux / gfp.h

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f8ffcd4..7e93a9a 100644 (file)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -104,6 +104,18 @@ struct vm_area_struct;
 /* 4GB DMA on some platforms */
 #define GFP_DMA32      __GFP_DMA32
 
+/* Convert GFP flags to their corresponding migrate type */
+static inline int allocflags_to_migratetype(gfp_t gfp_flags)
+{
+       WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
+
+       if (unlikely(page_group_by_mobility_disabled))
+               return MIGRATE_UNMOVABLE;
+
+       /* Group based on mobility */
+       return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
+               ((gfp_flags & __GFP_RECLAIMABLE) != 0);
+}
 
 static inline enum zone_type gfp_zone(gfp_t flags)
 {