__alloc_pages() failures reported due to fragmentation

[Larry Woodman]

We have seen a couple of __alloc_pages() failures due to fragmentation, 
there is plenty
of free memory but no large order pages available.  I think the problem 
is in
sock_alloc_send_pskb(), the gfp_mask includes __GFP_REPEAT but its never
used/passed to the page allocator.  Shouldnt the gfp_mask be passed to 
alloc_skb() ?

-------------------------------------------------------------------
struct sk_buff *sock_alloc_send_pskb()
{
      unsigned int gfp_mask;
... 
                                                                         
      gfp_mask = sk->sk_allocation;
      if (gfp_mask & __GFP_WAIT)
              gfp_mask |= __GFP_REPEAT;
...
      skb = alloc_skb(header_len, sk->sk_allocation);
--------------------------------------------------------------------


--- linux-2.6.18.noarch/net/core/sock.c.orig
+++ linux-2.6.18.noarch/net/core/sock.c
@@ -1154,7 +1154,7 @@ static struct sk_buff *sock_alloc_send_p
			goto failure;

		if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
-			skb = alloc_skb(header_len, sk->sk_allocation);
+			skb = alloc_skb(header_len, gfp_mask);
			if (skb) {
				int npages;
				int i;



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