reiserfs: shrink superblock if no xattrs
commitfe08a9d4982d9618ec25760ea715c46fe051e508
authorAlexey Dobriyan <adobriyan@gmail.com>
Tue, 8 May 2007 07:24:55 +0000 (8 00:24 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Tue, 8 May 2007 18:15:00 +0000 (8 11:15 -0700)
tree6535cfaf206d19cb0a5e09192f49b37e91ba6232
parent6f2fad748ccced5b9313efce2a2c7ae4c04ef564
reiserfs: shrink superblock if no xattrs

This makes in-core superblock fit into one cacheline here.

Before:
    struct dentry *            xattr_root;           /*   124     4 */
    /* --- cacheline 1 boundary (128 bytes) --- */
    struct rw_semaphore        xattr_dir_sem;        /*   128    12 */
    int                        j_errno;              /*   140     4 */
    }; /* size: 144, cachelines: 2 */
       /* sum members: 142, holes: 1, sum holes: 2 */
       /* last cacheline: 16 bytes */

After:
    int                        j_errno;              /*   124     4 */
    /* --- cacheline 1 boundary (128 bytes) --- */
    }; /* size: 128, cachelines: 1 */
       /* sum members: 126, holes: 1, sum holes: 2 */

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/reiserfs/super.c
include/linux/reiserfs_fs_sb.h