Messages in this thread Patch in this message | | | Date | Thu, 29 Nov 2001 22:08:57 -0800 | From | Andrew Morton <> | Subject | [patch] smarter atime updates |
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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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