Re: __alloc_pages() failures reported due to fragmentation

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Arjan van de Ven wrote:

--- 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;

Hi,

this is not actually right though... sk_allocation is very possible to
have a restricting mask compared to the one passed in (say "no highmem"
or even GFP_DMA) and you now discard this... probably better would be to
calculate a set of "transient" flags that you then or into the
sk_allocation mask at this time...

Greetings,
  Arjan van de Ven

Hi Arjan.  Right but this just includes __GFP_REPEAT in the mask so we can
defrag in __alloc_pages and only if GFP_WAIT was passed in origionally.

Larry


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