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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-16 08:52:13 +0400
committerDavid S. Miller <davem@davemloft.net>2010-06-16 22:55:39 +0400
commit317fe0e6c5dc9448bcef41a2e31fecfd3dba7f55 (patch)
treec2a042e1c8bb96b7fdeadf658309ead1b6e8dabc /net/ipv4
parentfdb93f8ac39aa5902f3d264edd50dffcabfdd13b (diff)
downloadlinux-317fe0e6c5dc9448bcef41a2e31fecfd3dba7f55.tar.xz
inetpeer: restore small inet_peer structures
Addition of rcu_head to struct inet_peer added 16bytes on 64bit arches. Thats a bit unfortunate, since old size was exactly 64 bytes. This can be solved, using an union between this rcu_head an four fields, that are normally used only when a refcount is taken on inet_peer. rcu_head is used only when refcnt=-1, right before structure freeing. Add a inet_peer_refcheck() function to check this assertion for a while. We can bring back SLAB_HWCACHE_ALIGN qualifier in kmem cache creation. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/inetpeer.c4
-rw-r--r--net/ipv4/route.c1
-rw-r--r--net/ipv4/tcp_ipv4.c11
3 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 349249fad2db..9ffa24b9a804 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -64,7 +64,7 @@
* usually under some other lock to prevent node disappearing
* dtime: unused node list lock
* v4daddr: unchangeable
- * ip_id_count: idlock
+ * ip_id_count: atomic value (no lock needed)
*/
static struct kmem_cache *peer_cachep __read_mostly;
@@ -129,7 +129,7 @@ void __init inet_initpeers(void)
peer_cachep = kmem_cache_create("inet_peer_cache",
sizeof(struct inet_peer),
- 0, SLAB_PANIC,
+ 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
NULL);
/* All the timers, started at system startup tend
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a291edbbc97f..03430de46166 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2881,6 +2881,7 @@ static int rt_fill_info(struct net *net,
error = rt->dst.error;
expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
if (rt->peer) {
+ inet_peer_refcheck(rt->peer);
id = atomic_read(&rt->peer->ip_id_count) & 0xffff;
if (rt->peer->tcp_ts_stamp) {
ts = rt->peer->tcp_ts;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7f9515c0379f..2e41e6f92968 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -204,10 +204,12 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
* TIME-WAIT * and initialize rx_opt.ts_recent from it,
* when trying new connection.
*/
- if (peer != NULL &&
- (u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
- tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
- tp->rx_opt.ts_recent = peer->tcp_ts;
+ if (peer) {
+ inet_peer_refcheck(peer);
+ if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
+ tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
+ tp->rx_opt.ts_recent = peer->tcp_ts;
+ }
}
}
@@ -1351,6 +1353,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
(dst = inet_csk_route_req(sk, req)) != NULL &&
(peer = rt_get_peer((struct rtable *)dst)) != NULL &&
peer->v4daddr == saddr) {
+ inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >
TCP_PAWS_WINDOW) {