linux-kernel - Re: __alloc_pages() failures reported due to fragmentation

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Date:	Fri, 03 Nov 2006 07:39:44 -0500
From:	Larry Woodman <lwoodman@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: __alloc_pages() failures reported due to fragmentation

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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