diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-10-03 21:27:25 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-03 21:43:39 (GMT) |
| commit | 96f817fedec48b59c9e8b22141cec4e56ad47913 (patch) | |
| tree | 81ca60148cfc015a3cfdb5b4d14a7b23f41cf2ac /net/ipv4/inet_diag.c | |
| parent | 40dc9ab277eb3d2d3d3442c20accb5dfa577e680 (diff) | |
| download | linux-96f817fedec48b59c9e8b22141cec4e56ad47913.tar.xz | |
tcp: shrink tcp6_timewait_sock by one cache line
While working on tcp listener refactoring, I found that it
would really make things easier if sock_common could include
the IPv6 addresses needed in the lookups, instead of doing
very complex games to get their values (depending on sock
being SYN_RECV, ESTABLISHED, TIME_WAIT)
For this to happen, I need to be sure that tcp6_timewait_sock
and tcp_timewait_sock consume same number of cache lines.
This is possible if we only use 32bits for tw_ttd, as we remove
one 32bit hole in inet_timewait_sock
inet_tw_time_stamp() is defined and used, even if its current
implementation looks like tcp_time_stamp : We might need finer
resolution for tcp_time_stamp in the future.
Before patch : sizeof(struct tcp6_timewait_sock) = 0xc8
After patch : sizeof(struct tcp6_timewait_sock) = 0xc0
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_diag.c')
| -rw-r--r-- | net/ipv4/inet_diag.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 5f64875..2200027 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -222,7 +222,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { - long tmo; + s32 tmo; struct inet_diag_msg *r; struct nlmsghdr *nlh; @@ -234,7 +234,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, r = nlmsg_data(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); - tmo = tw->tw_ttd - jiffies; + tmo = tw->tw_ttd - inet_tw_time_stamp(); if (tmo < 0) tmo = 0; @@ -248,7 +248,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, r->id.idiag_dst[0] = tw->tw_daddr; r->idiag_state = tw->tw_substate; r->idiag_timer = 3; - r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); + r->idiag_expires = jiffies_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; |