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Commit 1e19e02c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

[NET]: Reorder fields of struct dst_entry 



This last patch (but not least :) ) finally moves the next pointer at
the end of struct dst_entry. This permits to perform route cache
lookups with a minimal cost of one cache line per entry, instead of
two.

Both 32bits and 64bits platforms benefit from this new layout.

Signed-off-by: default avatarEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0c195c3f

include/net/dst.h

+10 −10
Original line number Diff line number Diff line
@@ -37,14 +37,7 @@ struct sk_buff; 


struct dst_entry

{

	union {

		struct dst_entry *next;

		struct rtable    *rt_next;

		struct rt6_info   *rt6_next;

		struct dn_route  *dn_next;

	};

	atomic_t		__refcnt;	/* client references	*/

	int			__use;

	struct rcu_head		rcu_head;

	struct dst_entry	*child;

	struct net_device       *dev;

	short			error;
@@ -55,7 +48,6 @@ struct dst_entry 
#define DST_NOPOLICY		4

#define DST_NOHASH		8

#define DST_BALANCED            0x10

	unsigned long		lastuse;

	unsigned long		expires;



	unsigned short		header_len;	/* more space at head required */
@@ -80,8 +72,16 @@ struct dst_entry 
#endif



	struct  dst_ops	        *ops;

	struct rcu_head		rcu_head;

		

	unsigned long		lastuse;

	atomic_t		__refcnt;	/* client references	*/

	int			__use;

	union {

		struct dst_entry *next;

		struct rtable    *rt_next;

		struct rt6_info   *rt6_next;

		struct dn_route  *dn_next;

	};

	char			info[0];

};