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inetpeer: restore small inet_peer structures

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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>
This commit is contained in:
Eric Dumazet 2010-06-16 04:52:13 +00:00 • committed by David S. Miller
parent fdb93f8ac3
commit 317fe0e6c5
4 changed files with 36 additions and 11 deletions
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1
net/ipv4/route.c
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@ -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;