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net: frag helper functions for mem limit tracking

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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>
This commit is contained in:
Jesper Dangaard Brouer
2013-01-28 23:45:12 +00:00
committed by David S. Miller
parent 6e34a8b37a
commit d433673e5f
6 changed files with 57 additions and 33 deletions
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6
net/ipv6/reassembly.c
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@@ -327,7 +327,7 @@ found:
}
fq->q.stamp = skb->tstamp;
fq->q.meat += skb->len;
atomic_add(skb->truesize, &fq->q.net->mem);
add_frag_mem_limit(&fq->q, skb->truesize);
/* The first fragment.
* nhoffset is obtained from the first fragment, of course.
@@ -429,7 +429,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
head->len -= clone->len;
clone->csum = 0;
clone->ip_summed = head->ip_summed;
atomic_add(clone->truesize, &fq->q.net->mem);
add_frag_mem_limit(&fq->q, clone->truesize);
}
/* We have to remove fragment header from datagram and to relocate
@@ -467,7 +467,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
}
fp = next;
}
atomic_sub(sum_truesize, &fq->q.net->mem);
sub_frag_mem_limit(&fq->q, sum_truesize);
head->next = NULL;
head->dev = dev;