Merge branch 'linux-2.6'

1 files changed, 14 insertions, 1 deletions

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 75e55dcdeb18..e10a90a93b5d 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -2,18 +2,29 @@
 #define _LINUX_MIGRATE_H
 
 #include <linux/mm.h>
+#include <linux/mempolicy.h>
+#include <linux/pagemap.h>
 
 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
 
+#ifdef CONFIG_MIGRATION
 /* Check if a vma is migratable */
 static inline int vma_migratable(struct vm_area_struct *vma)
 {
         if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
                 return 0;
+        /*
+         * Migration allocates pages in the highest zone. If we cannot
+         * do so then migration (at least from node to node) is not
+         * possible.
+         */
+        if (vma->vm_file &&
+                gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
+                                                                < policy_zone)
+                        return 0;
         return 1;
 }
 
-#ifdef CONFIG_MIGRATION
 extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
 extern int putback_lru_pages(struct list_head *l);
 extern int migrate_page(struct address_space *,
@@ -28,6 +39,8 @@ extern int migrate_vmas(struct mm_struct *mm,
                 const nodemask_t *from, const nodemask_t *to,
                 unsigned long flags);
 #else
+static inline int vma_migratable(struct vm_area_struct *vma)
+                                        { return 0; }
 
 static inline int isolate_lru_page(struct page *p, struct list_head *list)
                                         { return -ENOSYS; }