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[NET]: Convert hh_lock to seqlock.

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The hard header cache is in the main output path, so using
seqlock instead of reader/writer lock should reduce overhead.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2006-12-07 15:08:17 -08:00
committed by David S. Miller
parent eb991b3938
commit 3644f0cee7
5 changed files with 31 additions and 29 deletions
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11
net/core/neighbour.c
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@ -577,9 +577,10 @@ void neigh_destroy(struct neighbour *neigh)
while ((hh = neigh->hh) != NULL) {
neigh->hh = hh->hh_next;
hh->hh_next = NULL;
write_lock_bh(&hh->hh_lock);
write_seqlock_bh(&hh->hh_lock);
hh->hh_output = neigh_blackhole;
write_unlock_bh(&hh->hh_lock);
write_sequnlock_bh(&hh->hh_lock);
if (atomic_dec_and_test(&hh->hh_refcnt))
kfree(hh);
}
@ -897,9 +898,9 @@ static void neigh_update_hhs(struct neighbour *neigh)
if (update) {
for (hh = neigh->hh; hh; hh = hh->hh_next) {
write_lock_bh(&hh->hh_lock);
write_seqlock_bh(&hh->hh_lock);
update(hh, neigh->dev, neigh->ha);
write_unlock_bh(&hh->hh_lock);
write_sequnlock_bh(&hh->hh_lock);
}
}
}
@ -1089,7 +1090,7 @@ static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst,
break;
if (!hh && (hh = kzalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) {
rwlock_init(&hh->hh_lock);
seqlock_init(&hh->hh_lock);
hh->hh_type = protocol;
atomic_set(&hh->hh_refcnt, 0);
hh->hh_next = NULL;