tree ffb2fa359ee0751ce2f0f6dd29afc39eeda1ca86
parent 74f75a0cb7033918eb0fa4a50df25091ac75c16e
author Dave Chinner <dchinner@redhat.com> 1285322355 +1000
committer Alex Elder <aelder@sgi.com> 1287432477 -0500

xfs: pack xfs_buf structure more tightly

pahole reports the struct xfs_buf has quite a few holes in it, so
packing the structure better will reduce the size of it by 16 bytes.
Also, move all the fields used in cache lookups into the first
cacheline.

Before on x86_64:

        /* size: 320, cachelines: 5 */
	/* sum members: 298, holes: 6, sum holes: 22 */

After on x86_64:

        /* size: 304, cachelines: 5 */
	/* padding: 6 */
	/* last cacheline: 48 bytes */

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>