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 /include/net/inet_frag.h | |
| parent | 6d7b857d541ecd1d9bd997c97242d4ef94b19de2 (diff) | |
| download | lwn-3ef0eb0db4bf92c6d2510fe5c4dc51852746f206.tar.gz lwn-3ef0eb0db4bf92c6d2510fe5c4dc51852746f206.zip | |
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 'include/net/inet_frag.h')
| -rw-r--r-- | include/net/inet_frag.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h index e0eec7450f15..3f237db0a426 100644 --- a/include/net/inet_frag.h +++ b/include/net/inet_frag.h @@ -6,6 +6,7 @@ struct netns_frags { int nqueues; struct list_head lru_list; + spinlock_t lru_lock; /* The percpu_counter "mem" need to be cacheline aligned. * mem.count must not share cacheline with other writers @@ -116,4 +117,25 @@ static inline int sum_frag_mem_limit(struct netns_frags *nf) return percpu_counter_sum_positive(&nf->mem); } +static inline void inet_frag_lru_move(struct inet_frag_queue *q) +{ + spin_lock(&q->net->lru_lock); + list_move_tail(&q->lru_list, &q->net->lru_list); + spin_unlock(&q->net->lru_lock); +} + +static inline void inet_frag_lru_del(struct inet_frag_queue *q) +{ + spin_lock(&q->net->lru_lock); + list_del(&q->lru_list); + spin_unlock(&q->net->lru_lock); +} + +static inline void inet_frag_lru_add(struct netns_frags *nf, + struct inet_frag_queue *q) +{ + spin_lock(&nf->lru_lock); + list_add_tail(&q->lru_list, &nf->lru_list); + spin_unlock(&nf->lru_lock); +} #endif |