mm: mark page accessed before we write_end()

In testing a backport of the write_begin/write_end AOPs, a 10% re-read
regression was noticed when running iozone.  This regression was
introduced because the old AOPs would always do a mark_page_accessed(page)
after the commit_write, but when the new AOPs where introduced, the only
place this was kept was in pagecache_write_end().

This patch does the same thing in the generic case as what is done in
pagecache_write_end(), which is just to mark the page accessed before we
do write_end().

Signed-off-by: Josef Bacik <[email protected]>
Acked-by: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/filemap.c b/mm/filemap.c
index 22396713feb9684647aa5c90a3b18e6661b2f798..ccea3b665c12571ac32d6d936b3862e103f7b995 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2272,6 +2272,7 @@ again:
                pagefault_enable();
                flush_dcache_page(page);
 
+               mark_page_accessed(page);
                status = a_ops->write_end(file, mapping, pos, bytes, copied,
                                                page, fsdata);
                if (unlikely(status < 0))