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net: frag, move LRU list maintenance outside of rwlock

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Updating the fragmentation queues LRU (Least-Recently-Used) list,
required taking the hash writer lock.  However, the LRU list isn't
tied to the hash at all, so we can use a separate lock for it.

Original-idea-by: Florian Westphal <[email protected]>
Signed-off-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jesper Dangaard Brouer 2013-01-28 23:45:51 +00:00 • committed by David S. Miller
commit 3ef0eb0db4
5 changed files with 33 additions and 14 deletions
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12
net/ipv4/inet_fragment.c
View file

@ -75,6 +75,7 @@ void inet_frags_init_net(struct netns_frags *nf)
nf->nqueues = 0;
init_frag_mem_limit(nf);
INIT_LIST_HEAD(&nf->lru_list);
spin_lock_init(&nf->lru_lock);
}
EXPORT_SYMBOL(inet_frags_init_net);
@ -100,9 +101,9 @@ static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f)
{
write_lock(&f->lock);
hlist_del(&fq->list);
list_del(&fq->lru_list);
fq->net->nqueues--;
write_unlock(&f->lock);
inet_frag_lru_del(fq);
}
void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
@ -170,16 +171,17 @@ int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force)
work = frag_mem_limit(nf) - nf->low_thresh;
while (work > 0) {
read_lock(&f->lock);
spin_lock(&nf->lru_lock);
if (list_empty(&nf->lru_list)) {
read_unlock(&f->lock);
spin_unlock(&nf->lru_lock);
break;
}
q = list_first_entry(&nf->lru_list,
struct inet_frag_queue, lru_list);
atomic_inc(&q->refcnt);
read_unlock(&f->lock);
spin_unlock(&nf->lru_lock);
spin_lock(&q->lock);
if (!(q->last_in & INET_FRAG_COMPLETE))
@ -233,9 +235,9 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
atomic_inc(&qp->refcnt);
hlist_add_head(&qp->list, &f->hash[hash]);
list_add_tail(&qp->lru_list, &nf->lru_list);
nf->nqueues++;
write_unlock(&f->lock);
inet_frag_lru_add(nf, qp);
return qp;
}

4
net/ipv4/ip_fragment.c
View file

@ -529,9 +529,7 @@ found:
qp->q.meat == qp->q.len)
return ip_frag_reasm(qp, prev, dev);
write_lock(&ip4_frags.lock);
list_move_tail(&qp->q.lru_list, &qp->q.net->lru_list);
write_unlock(&ip4_frags.lock);
inet_frag_lru_move(&qp->q);
return -EINPROGRESS;
err: