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[SK_BUFF]: Convert skb->tail to sk_buff_data_t

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So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)

Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.

Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Arnaldo Carvalho de Melo 2007-04-19 20:29:13 -07:00 • committed by David S. Miller
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
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2
net/econet/af_econet.c
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@ -366,7 +366,7 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
fh->cb = cb;
fh->port = port;
if (sock->type != SOCK_DGRAM) {
skb->tail = skb->data;
skb_reset_tail_pointer(skb);
skb->len = 0;
} else if (res < 0)
goto out_free;