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| author | Filipe Manana <fdmanana@suse.com> | 2014-07-06 20:09:59 +0100 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-09-17 13:37:30 -0700 |
| commit | 27a3507de91e3dd51a2cf8dca4b33623dd6eaa88 (patch) | |
| tree | ef0a15fb445a2006a305cc9d61c918eb60d6c034 /fs/btrfs/extent_io.h | |
| parent | 6f84e23646704c93fa878c5b87a4990be8d1ca9c (diff) | |
| download | linux-0-day-27a3507de91e3dd51a2cf8dca4b33623dd6eaa88.tar.gz linux-0-day-27a3507de91e3dd51a2cf8dca4b33623dd6eaa88.tar.xz | |
Btrfs: reduce size of struct extent_state
The tree field of struct extent_state was only used to figure out if
an extent state was connected to an inode's io tree or not. For this
we can just use the rb_node field itself.
On a x86_64 system with this change the sizeof(struct extent_state) is
reduced from 96 bytes down to 88 bytes, meaning that with a page size
of 4096 bytes we can now store 46 extent states per page instead of 42.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
| -rw-r--r-- | fs/btrfs/extent_io.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index ccc264e7bde12..1f608166fe670 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -108,7 +108,6 @@ struct extent_state { struct rb_node rb_node; /* ADD NEW ELEMENTS AFTER THIS */ - struct extent_io_tree *tree; wait_queue_head_t wq; atomic_t refs; unsigned long state; |