From 3ef0eb0db4bf92c6d2510fe5c4dc51852746f206 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Mon, 28 Jan 2013 23:45:51 +0000 Subject: 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 Signed-off-by: Jesper Dangaard Brouer Signed-off-by: David S. Miller --- include/net/inet_frag.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'include/net') 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 -- cgit v1.2.3