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sctp: Pack dst_cookie into 1st cacheline hole for 64bit host

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As dst_cookie is used in fast path sctp_transport_dst_check.

Before:
struct sctp_transport {
	struct list_head           transports;           /*     0    16 */
	atomic_t                   refcnt;               /*    16     4 */
	__u32                      dead:1;               /*    20:31  4 */
	__u32                      rto_pending:1;        /*    20:30  4 */
	__u32                      hb_sent:1;            /*    20:29  4 */
	__u32                      pmtu_pending:1;       /*    20:28  4 */

	/* XXX 28 bits hole, try to pack */

	__u32                      sack_generation;      /*    24     4 */

	/* XXX 4 bytes hole, try to pack */

	struct flowi               fl;                   /*    32    64 */
	/* --- cacheline 1 boundary (64 bytes) was 32 bytes ago --- */
	union sctp_addr            ipaddr;               /*    96    28 */

After:
struct sctp_transport {
	struct list_head           transports;           /*     0    16 */
	atomic_t                   refcnt;               /*    16     4 */
	__u32                      dead:1;               /*    20:31  4 */
	__u32                      rto_pending:1;        /*    20:30  4 */
	__u32                      hb_sent:1;            /*    20:29  4 */
	__u32                      pmtu_pending:1;       /*    20:28  4 */

	/* XXX 28 bits hole, try to pack */

	__u32                      sack_generation;      /*    24     4 */
	u32                        dst_cookie;           /*    28     4 */
	struct flowi               fl;                   /*    32    64 */
	/* --- cacheline 1 boundary (64 bytes) was 32 bytes ago --- */
	union sctp_addr            ipaddr;               /*    96    28 */

Signed-off-by: Fan Du <[email protected]>
Acked-by: Neil Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
fan.du 2013-08-05 17:13:03 +08:00 • committed by David S. Miller
commit 5a139296f8
1 changed files with 1 additions and 1 deletions
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2
include/net/sctp/structs.h
View file

@ -782,6 +782,7 @@ struct sctp_transport {
/* Has this transport moved the ctsn since we last sacked */
__u32 sack_generation;
u32 dst_cookie;
struct flowi fl;
@ -946,7 +947,6 @@ struct sctp_transport {
__u64 hb_nonce;
struct rcu_head rcu;
u32 dst_cookie;
};
struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,