dev_vdbg(), available with -DVERBOSE_DEBUG

[karo-tx-linux.git] / include / linux / migrate.h

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 48148e0cdbd179725de653eff14a229c26ad6153..e10a90a93b5d25a53fd12b5e623e40ffbc285bf3 100644 (file)
--- 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; }