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btrfs: reorder btrfs_transaction members for better packing 

There are now 20 bytes of holes, we can reduce that to 4 by minor
changes. Moving 'aborted' to the status and flags is also more logical,
similar for num_dirty_bgs. The size goes from 432 to 416.

Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-11-08 01:54:33 +01:00
parent 165c8b022c
commit 5302e08964
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/transaction.h
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@ -58,6 +58,7 @@ struct btrfs_transaction {
/* Be protected by fs_info->trans_lock when we want to change it. */
enum btrfs_trans_state state;
int aborted;
struct list_head list;
struct extent_io_tree dirty_pages;
unsigned long start_time;
@ -70,7 +71,6 @@ struct btrfs_transaction {
struct list_head dirty_bgs;
struct list_head io_bgs;
struct list_head dropped_roots;
unsigned int num_dirty_bgs;
/*
* we need to make sure block group deletion doesn't race with
@ -79,11 +79,11 @@ struct btrfs_transaction {
*/
struct mutex cache_write_mutex;
spinlock_t dirty_bgs_lock;
unsigned int num_dirty_bgs;
/* Protected by spin lock fs_info->unused_bgs_lock. */
struct list_head deleted_bgs;
spinlock_t dropped_roots_lock;
struct btrfs_delayed_ref_root delayed_refs;
int aborted;
struct btrfs_fs_info *fs_info;
};