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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 <fw@strlen.de>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2013-01-28 23:45:51 +00:00 • committed by David S. Miller
parent 6d7b857d54
commit 3ef0eb0db4
5 changed files with 33 additions and 14 deletions
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22
include/net/inet_frag.h
View file

@ -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