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authorArnaldo Carvalho de Melo <acme@redhat.com>2008-02-03 15:06:59 +0300
committerDavid S. Miller <davem@davemloft.net>2008-02-03 15:28:52 +0300
commit4e7e5cfe3825b4d854fc005d784a6f551b3c039f (patch)
tree0facec726e4a8f410e74d30234bb8f4894f8c186 /include/net
parentab1e0a13d70299e792fd0527cefd070c1405fa5b (diff)
downloadlinux-4e7e5cfe3825b4d854fc005d784a6f551b3c039f.tar.xz
[INET6]: Reorganize struct inet6_dev to save 8 bytes
And make it a multiple of a 64 bytes, reducing cacheline trashing: Before: [acme@doppio net-2.6]$ pahole -C inet6_dev net/dccp/ipv6.o struct inet6_dev { <SNIP> long unsigned int mc_maxdelay; /* 48 8 */ unsigned char mc_qrv; /* 56 1 */ unsigned char mc_gq_running; /* 57 1 */ unsigned char mc_ifc_count; /* 58 1 */ /* XXX 5 bytes hole, try to pack */ /* --- cacheline 1 boundary (64 bytes) --- */ struct timer_list mc_gq_timer; /* 64 48 */ <SNIP> __u32 if_flags; /* 180 4 */ int dead; /* 184 4 */ u8 rndid[8]; /* 188 8 */ /* XXX 4 bytes hole, try to pack */ /* --- cacheline 3 boundary (192 bytes) was 8 bytes ago --- */ struct timer_list regen_timer; /* 200 48 */ <SNIP> /* size: 456, cachelines: 8 */ /* sum members: 447, holes: 2, sum holes: 9 */ /* last cacheline: 8 bytes */ }; After: net-2.6/net/ipv6/af_inet6.c: struct inet6_dev | -8 1 struct changed Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/if_inet6.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index b24508abb850..66c43e29ea0a 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -166,11 +166,11 @@ struct inet6_dev
struct ifmcaddr6 *mc_list;
struct ifmcaddr6 *mc_tomb;
rwlock_t mc_lock;
- unsigned long mc_v1_seen;
- unsigned long mc_maxdelay;
unsigned char mc_qrv;
unsigned char mc_gq_running;
unsigned char mc_ifc_count;
+ unsigned long mc_v1_seen;
+ unsigned long mc_maxdelay;
struct timer_list mc_gq_timer; /* general query timer */
struct timer_list mc_ifc_timer; /* interface change timer */