From: Josef Bacik <josef@redhat.com>
Date: Sun, 5 Jul 2009 19:08:18 +0000 (-0700)
Subject: mm: mark page accessed before we write_end()
X-Git-Tag: v2.6.27.29~20
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e9d83e0a2edc0e528434bad4a7018533a27219cc;p=thirdparty%2Fkernel%2Fstable.git

mm: mark page accessed before we write_end()

commit c8236db9cd7aa492dcfcdcca702638e704abed49 upstream.

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 <jbacik@redhat.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/mm/filemap.c b/mm/filemap.c
index 8a477d378977d..bff0b000cec2d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2441,6 +2441,7 @@ 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))