Messages in this thread | | | Date | Fri, 30 Nov 2001 13:44:42 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | Re: [patch] smarter atime updates |
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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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