Messages in this thread |  | | Date | Fri, 30 Nov 2001 12:29:39 -0500 | From | Chris Mason <> | Subject | Re: [patch] smarter atime updates |
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On Friday, November 30, 2001 01:44:42 PM -0200 Marcelo Tosatti <marcelo@conectiva.com.br> wrote:
> > Now are you sure this can't break anything ? >
It shouldn't hurt reiserfs at least, I like it.
-chris
> 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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