Commit d475f090 authored Oct 08, 2015 by Eric Dumazet Committed by David S. Miller Oct 12, 2015

tcp: shrink tcp_timewait_sock by 8 bytes



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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent ed53d0ab

include/linux/tcp.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -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;

include/net/sock.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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: */
		};