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    SubjectRe: [patch] smarter atime updates
    Marcelo Tosatti wrote:

    >Now are you sure this can't break anything ?
    >
    >On Thu, 29 Nov 2001, Andrew Morton wrote:
    >
    >>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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    >Please read the FAQ at http://www.tux.org/lkml/
    >
    >
    nice optimization.

    Hans


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