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authorJesper Dangaard Brouer <brouer@redhat.com>2013-01-29 00:45:12 +0100
committerDavid S. Miller <davem@davemloft.net>2013-01-29 19:36:24 +0100
commitd433673e5f9180e05a770c4b2ab18c08ad51cc21 (patch)
tree7d71bb8483724418e6a4f48cc4099a8722c704c8 /net/ipv4/ip_fragment.c
parentnet: cacheline adjust struct inet_frag_queue (diff)
downloadlinux-d433673e5f9180e05a770c4b2ab18c08ad51cc21.tar.xz
linux-d433673e5f9180e05a770c4b2ab18c08ad51cc21.zip
net: frag helper functions for mem limit tracking
This change is primarily a preparation to ease the extension of memory limit tracking. The change does reduce the number atomic operation, during freeing of a frag queue. This does introduce a some performance improvement, as these atomic operations are at the core of the performance problems seen on NUMA systems. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_fragment.c')
-rw-r--r--net/ipv4/ip_fragment.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index f55a4e61bfb8..927fe58caf46 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -122,7 +122,7 @@ int ip_frag_nqueues(struct net *net)
int ip_frag_mem(struct net *net)
{
- return atomic_read(&net->ipv4.frags.mem);
+ return sum_frag_mem_limit(&net->ipv4.frags);
}
static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
@@ -161,13 +161,6 @@ static bool ip4_frag_match(struct inet_frag_queue *q, void *a)
qp->user == arg->user;
}
-/* Memory Tracking Functions. */
-static void frag_kfree_skb(struct netns_frags *nf, struct sk_buff *skb)
-{
- atomic_sub(skb->truesize, &nf->mem);
- kfree_skb(skb);
-}
-
static void ip4_frag_init(struct inet_frag_queue *q, void *a)
{
struct ipq *qp = container_of(q, struct ipq, q);
@@ -340,6 +333,7 @@ static inline int ip_frag_too_far(struct ipq *qp)
static int ip_frag_reinit(struct ipq *qp)
{
struct sk_buff *fp;
+ unsigned int sum_truesize = 0;
if (!mod_timer(&qp->q.timer, jiffies + qp->q.net->timeout)) {
atomic_inc(&qp->q.refcnt);
@@ -349,9 +343,12 @@ static int ip_frag_reinit(struct ipq *qp)
fp = qp->q.fragments;
do {
struct sk_buff *xp = fp->next;
- frag_kfree_skb(qp->q.net, fp);
+
+ sum_truesize += fp->truesize;
+ kfree_skb(fp);
fp = xp;
} while (fp);
+ sub_frag_mem_limit(&qp->q, sum_truesize);
qp->q.last_in = 0;
qp->q.len = 0;
@@ -496,7 +493,8 @@ found:
qp->q.fragments = next;
qp->q.meat -= free_it->len;
- frag_kfree_skb(qp->q.net, free_it);
+ sub_frag_mem_limit(&qp->q, free_it->truesize);
+ kfree_skb(free_it);
}
}
@@ -519,7 +517,7 @@ found:
qp->q.stamp = skb->tstamp;
qp->q.meat += skb->len;
qp->ecn |= ecn;
- atomic_add(skb->truesize, &qp->q.net->mem);
+ add_frag_mem_limit(&qp->q, skb->truesize);
if (offset == 0)
qp->q.last_in |= INET_FRAG_FIRST_IN;
@@ -617,7 +615,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
head->len -= clone->len;
clone->csum = 0;
clone->ip_summed = head->ip_summed;
- atomic_add(clone->truesize, &qp->q.net->mem);
+ add_frag_mem_limit(&qp->q, clone->truesize);
}
skb_push(head, head->data - skb_network_header(head));
@@ -645,7 +643,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
}
fp = next;
}
- atomic_sub(sum_truesize, &qp->q.net->mem);
+ sub_frag_mem_limit(&qp->q, sum_truesize);
head->next = NULL;
head->dev = dev;