X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fmigrate.h;h=e10a90a93b5d25a53fd12b5e623e40ffbc285bf3;hb=3b86301f1217553a80a0ff59a601b0fa3f257b8d;hp=48148e0cdbd179725de653eff14a229c26ad6153;hpb=7b2259b3e53f128c10a9fded0965e69d4a949847;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 48148e0..e10a90a 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -2,10 +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;
+}
+
 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 *,
@@ -20,6 +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; }