[PATCH v2 net-next 4/4] tcp: shrink tcp_timewait_sock by 8 bytes

[Eric Dumazet]

Reducing tcp_timewait_sock from 280 bytes to 272 bytes
allows SLAB to pack 15 objects per page instead of 14 (on x86)

Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 include/linux/tcp.h | 4 ++--
 include/net/sock.h  | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index e442e6e9a365..86a7edaa6797 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -356,8 +356,8 @@ static inline struct tcp_sock *tcp_sk(const struct sock *sk)
 
 struct tcp_timewait_sock {
        struct inet_timewait_sock tw_sk;
-       u32                       tw_rcv_nxt;
-       u32                       tw_snd_nxt;
+#define tw_rcv_nxt tw_sk.__tw_common.skc_tw_rcv_nxt
+#define tw_snd_nxt tw_sk.__tw_common.skc_tw_snd_nxt
        u32                       tw_rcv_wnd;
        u32                       tw_ts_offset;
        u32                       tw_ts_recent;
diff --git a/include/net/sock.h b/include/net/sock.h
index fce12399fad4..288934da0ae3 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -229,6 +229,7 @@ struct sock_common {
        union {
                int             skc_incoming_cpu;
                u32             skc_rcv_wnd;
+               u32             skc_tw_rcv_nxt; /* struct tcp_timewait_sock  */
        };
 
        atomic_t                skc_refcnt;
@@ -237,6 +238,7 @@ struct sock_common {
        union {
                u32             skc_rxhash;
                u32             skc_window_clamp;
+               u32             skc_tw_snd_nxt; /* struct tcp_timewait_sock */
        };
        /* public: */
 };
-- 
2.6.0.rc2.230.g3dd15c0

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