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[NETNS][FRAGS]: Make the LRU list per namespace.

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The inet_frags.lru_list is used for evicting only, so we have
to make it per-namespace, to evict only those fragments, who's
namespace exceeded its high threshold, but not the whole hash.
Besides, this helps to avoid long loops  in evictor.

The spinlock is not per-namespace because it protects the
hash table as well, which is global.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov
2008-01-22 06:11:48 -08:00
committed by David S. Miller
parent 3b4bc4a2bf
commit 3140c25c82
5 changed files with 8 additions and 8 deletions
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8
net/ipv4/inet_fragment.c
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@@ -57,7 +57,6 @@ void inet_frags_init(struct inet_frags *f)
for (i = 0; i < INETFRAGS_HASHSZ; i++)
INIT_HLIST_HEAD(&f->hash[i]);
INIT_LIST_HEAD(&f->lru_list);
rwlock_init(&f->lock);
f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
@@ -74,6 +73,7 @@ void inet_frags_init_net(struct netns_frags *nf)
{
nf->nqueues = 0;
atomic_set(&nf->mem, 0);
INIT_LIST_HEAD(&nf->lru_list);
}
EXPORT_SYMBOL(inet_frags_init_net);
@@ -156,12 +156,12 @@ int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
work = atomic_read(&nf->mem) - nf->low_thresh;
while (work > 0) {
read_lock(&f->lock);
if (list_empty(&f->lru_list)) {
if (list_empty(&nf->lru_list)) {
read_unlock(&f->lock);
break;
}
q = list_first_entry(&f->lru_list,
q = list_first_entry(&nf->lru_list,
struct inet_frag_queue, lru_list);
atomic_inc(&q->refcnt);
read_unlock(&f->lock);
@@ -211,7 +211,7 @@ 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, &f->lru_list);
list_add_tail(&qp->lru_list, &nf->lru_list);
nf->nqueues++;
write_unlock(&f->lock);
return qp;