On Mon, Jul 23, 2018 at 09:04:06AM -0400, Brian Foster wrote:
> Both structures have holes due to member alignment. Move dop_low to
> the end of xfs_defer ops to sanitize the cache line alignment and
> move t_flags to save 8 bytes in xfs_trans.
>
> Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
--D
> ---
> fs/xfs/libxfs/xfs_defer.h | 3 ++-
> fs/xfs/xfs_trans.h | 2 +-
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
> index 58c979c9f3fa..8f58f217fdff 100644
> --- a/fs/xfs/libxfs/xfs_defer.h
> +++ b/fs/xfs/libxfs/xfs_defer.h
> @@ -49,13 +49,14 @@ enum xfs_defer_ops_type {
> #define XFS_DEFER_OPS_NR_BUFS 2 /* join up to two buffers */
>
> struct xfs_defer_ops {
> - bool dop_low; /* alloc in low mode */
> struct list_head dop_intake; /* unlogged pending work */
> struct list_head dop_pending; /* logged pending work */
>
> /* relog these with each roll */
> struct xfs_inode *dop_inodes[XFS_DEFER_OPS_NR_INODES];
> struct xfs_buf *dop_bufs[XFS_DEFER_OPS_NR_BUFS];
> +
> + bool dop_low; /* alloc in low mode */
> };
>
> void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type,
> diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
> index 37fdacc690c7..6f857af61455 100644
> --- a/fs/xfs/xfs_trans.h
> +++ b/fs/xfs/xfs_trans.h
> @@ -102,12 +102,12 @@ typedef struct xfs_trans {
> unsigned int t_blk_res_used; /* # of resvd blocks used */
> unsigned int t_rtx_res; /* # of rt extents resvd */
> unsigned int t_rtx_res_used; /* # of resvd rt extents used */
> + unsigned int t_flags; /* misc flags */
> xfs_fsblock_t t_firstblock; /* first block allocated */
> struct xlog_ticket *t_ticket; /* log mgr ticket */
> struct xfs_mount *t_mountp; /* ptr to fs mount struct */
> struct xfs_dquot_acct *t_dqinfo; /* acctg info for dquots */
> struct xfs_defer_ops *t_dfops; /* dfops reference */
> - unsigned int t_flags; /* misc flags */
> int64_t t_icount_delta; /* superblock icount change */
> int64_t t_ifree_delta; /* superblock ifree change */
> int64_t t_fdblocks_delta; /* superblock fdblocks chg */
> --
> 2.17.1
>
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