fs.h: remove 8 bytes of padding from block_device on 64bit builds (f3ccfcda) · Commits · e / devices / android_kernel_sony_msm8994

Re-ordering struct block_inode to remove 8 bytes of padding on 64 bit builds, which also shrinks bdev_inode by 8 bytes (776 -> 768) allowing it to fit into one fewer cache lines. Signed-off-by:

Richard Kennedy <richard@rsk.demon.co.uk> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

include/linux/fs.h

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -662,9 +662,9 @@ struct address_space {

	struct block_device {		struct block_device {
	dev_t bd_dev; /* not a kdev_t - it's a search key */		dev_t bd_dev; /* not a kdev_t - it's a search key */
			int bd_openers;
	struct inode * bd_inode; /* will die */		struct inode * bd_inode; /* will die */
	struct super_block * bd_super;		struct super_block * bd_super;
	int bd_openers;
	struct mutex bd_mutex; /* open/close mutex */		struct mutex bd_mutex; /* open/close mutex */
	struct list_head bd_inodes;		struct list_head bd_inodes;
	void * bd_claiming;		void * bd_claiming;