[PATCH 0/6] Shrink some data structures

[David Sterba <dsterba@suse.com>]

Unused members removed, other reordered.

struct btrfs_transaction:

-       /* size: 432, cachelines: 7, members: 27 */
-       /* sum members: 416, holes: 4, sum holes: 16 */
-       /* last cacheline: 48 bytes */
+       /* size: 416, cachelines: 7, members: 27 */
+       /* sum members: 412, holes: 1, sum holes: 4 */
+       /* last cacheline: 32 bytes */

struct btrfs_trans_handle:

-       /* size: 120, cachelines: 2, members: 20 */
-       /* sum members: 117, holes: 1, sum holes: 3 */
-       /* last cacheline: 56 bytes */
+       /* size: 104, cachelines: 2, members: 19 */
+       /* last cacheline: 40 bytes *

And incidentally the .text size goes down as well:

   text    data     bss     dec     hex filename
 985430   75100   18560 1079090  107732 pre/btrfs.ko
 985243   75100   18560 1078903  107677 post/btrfs.ko

David Sterba (6):
  btrfs: switch btrfs_trans_handle::adding_csums to bool
  btrfs: remove unused member of btrfs_trans_handle
  btrfs: switch to refcount_t type for btrfs_trans_handle::use_count
  btrfs: reoder btrfs_trans_handle members for better packing
  btrfs: use narrower type for btrfs_transaction::num_dirty_bgs
  btrfs: reoder btrfs_transaction members for better packing

 fs/btrfs/extent-tree.c |  2 +-
 fs/btrfs/inode.c       |  4 ++--
 fs/btrfs/transaction.c | 12 ++++++------
 fs/btrfs/transaction.h | 11 +++++------
 4 files changed, 14 insertions(+), 15 deletions(-)

-- 
2.14.3