forked from luck/tmp_suning_uos_patched
9b0c290e78
Perf tools session at NFWS 2010 pointed out a false sharing on struct fib_alias that can be avoided pretty easily, if we set FA_S_ACCESSED bit only if needed (ie : not already set) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#ifndef _FIB_LOOKUP_H
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#define _FIB_LOOKUP_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <net/ip_fib.h>
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struct fib_alias {
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struct list_head fa_list;
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struct fib_info *fa_info;
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u8 fa_tos;
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u8 fa_type;
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u8 fa_scope;
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u8 fa_state;
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struct rcu_head rcu;
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};
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#define FA_S_ACCESSED 0x01
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/* Dont write on fa_state unless needed, to keep it shared on all cpus */
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static inline void fib_alias_accessed(struct fib_alias *fa)
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{
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if (!(fa->fa_state & FA_S_ACCESSED))
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fa->fa_state |= FA_S_ACCESSED;
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}
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/* Exported by fib_semantics.c */
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extern int fib_semantic_match(struct list_head *head,
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const struct flowi *flp,
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struct fib_result *res, int prefixlen, int fib_flags);
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extern void fib_release_info(struct fib_info *);
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extern struct fib_info *fib_create_info(struct fib_config *cfg);
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extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
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extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
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u32 tb_id, u8 type, u8 scope, __be32 dst,
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int dst_len, u8 tos, struct fib_info *fi,
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unsigned int);
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extern void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
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int dst_len, u32 tb_id, struct nl_info *info,
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unsigned int nlm_flags);
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extern struct fib_alias *fib_find_alias(struct list_head *fah,
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u8 tos, u32 prio);
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extern int fib_detect_death(struct fib_info *fi, int order,
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struct fib_info **last_resort,
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int *last_idx, int dflt);
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static inline void fib_result_assign(struct fib_result *res,
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struct fib_info *fi)
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{
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if (res->fi != NULL)
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fib_info_put(res->fi);
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res->fi = fi;
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if (fi != NULL)
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atomic_inc(&fi->fib_clntref);
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}
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#endif /* _FIB_LOOKUP_H */
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