mm, proc: reduce cost of /proc/pid/smaps for unpopulated shmem mappings

[cascardo/linux.git] / include / linux / shmem_fs.h

diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 50777b5..a43f41c 100644 (file)
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -60,6 +60,10 @@ extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
 extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
 extern int shmem_unuse(swp_entry_t entry, struct page *page);
 
+extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
+extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
+                                               pgoff_t start, pgoff_t end);
+
 static inline struct page *shmem_read_mapping_page(
                                struct address_space *mapping, pgoff_t index)
 {