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SubjectRe: [patch] smarter atime updates
From
Date
Hi,

Andrew Morton <akpm@zip.com.au> writes:

> 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;

in include/linux/fs.h:

#define UPDATE_ATIME(inode) \
do { \
if ((inode)->i_atime != CURRENT_TIME) \
update_atime (inode); \
} while (0)
How about this macro? (add likely()?)
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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