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    Subject[patch] smarter atime updates
    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.

    -
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