mm: count reclaimable pages per BDI

[safe/jmp/linux-2.6] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index d821321..9b3c4ee 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -827,6 +827,8 @@ int __set_page_dirty_nobuffers(struct page *page)
                        WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
                        if (mapping_cap_account_dirty(mapping)) {
                                __inc_zone_page_state(page, NR_FILE_DIRTY);
+                               __inc_bdi_stat(mapping->backing_dev_info,
+                                               BDI_RECLAIMABLE);
                                task_io_account_write(PAGE_CACHE_SIZE);
                        }
                        radix_tree_tag_set(&mapping->page_tree,
@@ -961,6 +963,8 @@ int clear_page_dirty_for_io(struct page *page)
                 */
                if (TestClearPageDirty(page)) {
                        dec_zone_page_state(page, NR_FILE_DIRTY);
+                       dec_bdi_stat(mapping->backing_dev_info,
+                                       BDI_RECLAIMABLE);
                        return 1;
                }
                return 0;