#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 *,
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; }