From: Andrew Morton <akpm@zip.com.au>
To: Marcelo Tosatti <marcelo@conectiva.com.br>,
Linus Torvalds <torvalds@transmeta.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: [patch] smarter atime updates
Date: Thu, 29 Nov 2001 22:08:57 -0800 [thread overview]
Message-ID: <3C072279.D346CD09@zip.com.au> (raw)
mark_inode_dirty() is quite expensive for journalling filesystems,
and we're calling it a lot more than we need to.
--- linux-2.4.17-pre1/fs/inode.c Mon Nov 26 11:52:07 2001
+++ linux-akpm/fs/inode.c Thu Nov 29 21:53:02 2001
@@ -1187,6 +1187,8 @@ void __init inode_init(unsigned long mem
void update_atime (struct inode *inode)
{
+ if (inode->i_atime == CURRENT_TIME)
+ return;
if ( IS_NOATIME (inode) ) return;
if ( IS_NODIRATIME (inode) && S_ISDIR (inode->i_mode) ) return;
if ( IS_RDONLY (inode) ) return;
with this patch, the time to read a 10 meg file with 10 million
read()s falls from 38 seconds (ext3), 39 seconds (reiserfs) and
11.6 seconds (ext2) down to 10.5 seconds.
-
next reply other threads:[~2001-11-30 6:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-30 6:08 Andrew Morton [this message]
2001-11-30 9:45 ` [patch] smarter atime updates OGAWA Hirofumi
2001-11-30 9:56 ` Andrew Morton
2001-11-30 10:40 ` OGAWA Hirofumi
2001-11-30 22:34 ` H. Peter Anvin
2001-11-30 15:44 ` Marcelo Tosatti
2001-11-30 17:29 ` Chris Mason
2001-11-30 20:03 ` Robert Love
2001-11-30 21:52 ` Andreas Dilger
2001-11-30 21:50 ` Linus Torvalds
2001-11-30 22:30 ` Simon Kirby
2001-11-30 23:31 ` H. Peter Anvin
2001-12-01 9:22 ` Hans Reiser
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