mm: more likely reclaim MADV_SEQUENTIAL mappings

[sfrench/cifs-2.6.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index f01b7eed6e16c4e3f32e039b7f2223ca598f40aa..99e8d5c7b3126a455d664942d0f90621ce6c8825 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -767,8 +767,9 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
                        else {
                                if (pte_dirty(ptent))
                                        set_page_dirty(page);
-                               if (pte_young(ptent))
-                                       SetPageReferenced(page);
+                               if (pte_young(ptent) &&
+                                   likely(!VM_SequentialReadHint(vma)))
+                                       mark_page_accessed(page);
                                file_rss--;
                        }
                        page_remove_rmap(page, vma);
@@ -2266,7 +2267,7 @@ int vmtruncate(struct inode * inode, loff_t offset)
                unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
        }
 
-       if (inode->i_op && inode->i_op->truncate)
+       if (inode->i_op->truncate)
                inode->i_op->truncate(inode);
        return 0;
 
@@ -2286,7 +2287,7 @@ int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
         * a way to truncate a range of blocks (punch a hole) -
         * we should return failure right now.
         */
-       if (!inode->i_op || !inode->i_op->truncate_range)
+       if (!inode->i_op->truncate_range)
                return -ENOSYS;
 
        mutex_lock(&inode->i_mutex);
@@ -3075,3 +3076,18 @@ void print_vma_addr(char *prefix, unsigned long ip)
        }
        up_read(&current->mm->mmap_sem);
 }
+
+#ifdef CONFIG_PROVE_LOCKING
+void might_fault(void)
+{
+       might_sleep();
+       /*
+        * it would be nicer only to annotate paths which are not under
+        * pagefault_disable, however that requires a larger audit and
+        * providing helpers like get_user_atomic.
+        */
+       if (!in_atomic() && current->mm)
+               might_lock_read(&current->mm->mmap_sem);
+}
+EXPORT_SYMBOL(might_fault);
+#endif