| Message ID | 1408015514-18021-1-git-send-email-fdmanana@suse.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
On Thu, Aug 14, 2014 at 12:25:14PM +0100, Filipe Manana wrote: > The map_start and map_len fields aren't used anywhere, so just remove > them. On a x86_64 system, this reduced sizeof(struct extent_buffer) > from 296 bytes to 280 bytes, and therefore 14 extent_buffer structs can > now fit into a page instead of 13. > > Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.cz> Nice catch. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index ce02cc9..5e91fb9 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -125,8 +125,6 @@ struct extent_state { struct extent_buffer { u64 start; unsigned long len; - unsigned long map_start; - unsigned long map_len; unsigned long bflags; struct btrfs_fs_info *fs_info; spinlock_t refs_lock;
The map_start and map_len fields aren't used anywhere, so just remove them. On a x86_64 system, this reduced sizeof(struct extent_buffer) from 296 bytes to 280 bytes, and therefore 14 extent_buffer structs can now fit into a page instead of 13. Signed-off-by: Filipe Manana <fdmanana@suse.com> --- fs/btrfs/extent_io.h | 2 -- 1 file changed, 2 deletions(-)