diff options
| author | David Sterba <dsterba@suse.cz> | 2015-01-14 18:52:13 (GMT) |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-01-22 02:02:04 (GMT) |
| commit | 9ee49a047dc53fd21808cbb7f3b6a3345463e834 (patch) | |
| tree | 98710aa584c84501c00ecf2227138ff4f44d5396 /fs/btrfs/inode.c | |
| parent | 5efa0490cc94aee06cd8d282683e22a8ce0a0026 (diff) | |
| download | linux-9ee49a047dc53fd21808cbb7f3b6a3345463e834.tar.xz | |
btrfs: switch extent_state state to unsigned
Currently there's a 4B hole in the structure between refs and state and there
are only 16 bits used so we can make it unsigned. This will get a better
packing and may save some stack space for local variables.
The size of extent_state gets reduced by 8B and there are usually a lot
of slab objects.
struct extent_state {
u64 start; /* 0 8 */
u64 end; /* 8 8 */
struct rb_node rb_node; /* 16 24 */
wait_queue_head_t wq; /* 40 24 */
/* --- cacheline 1 boundary (64 bytes) --- */
atomic_t refs; /* 64 4 */
/* XXX 4 bytes hole, try to pack */
long unsigned int state; /* 72 8 */
u64 private; /* 80 8 */
/* size: 88, cachelines: 2, members: 7 */
/* sum members: 84, holes: 1, sum holes: 4 */
/* last cacheline: 24 bytes */
};
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5e52920..220f0c3 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1604,7 +1604,7 @@ static void btrfs_del_delalloc_inode(struct btrfs_root *root, * have pending delalloc work to be done. */ static void btrfs_set_bit_hook(struct inode *inode, - struct extent_state *state, unsigned long *bits) + struct extent_state *state, unsigned *bits) { if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC)) @@ -1645,7 +1645,7 @@ static void btrfs_set_bit_hook(struct inode *inode, */ static void btrfs_clear_bit_hook(struct inode *inode, struct extent_state *state, - unsigned long *bits) + unsigned *bits) { u64 len = state->end + 1 - state->start; |