diff options
| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2013-01-28 23:45:51 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-01-29 13:36:24 -0500 |
| commit | 3ef0eb0db4bf92c6d2510fe5c4dc51852746f206 (patch) | |
| tree | 3f0d424f598a82eb17a5199d27fec9964513e16e /net/ipv4 | |
| parent | 6d7b857d541ecd1d9bd997c97242d4ef94b19de2 (diff) | |
| download | linux-3ef0eb0db4bf92c6d2510fe5c4dc51852746f206.tar.bz2 | |
net: frag, move LRU list maintenance outside of rwlock
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 <fw@strlen.de>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/inet_fragment.c | 12 | ||||
| -rw-r--r-- | net/ipv4/ip_fragment.c | 4 |
2 files changed, 8 insertions, 8 deletions
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index b82520565098..2e453bde6992 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -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; } diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 927fe58caf46..1211613c6c34 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -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: |