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net: allow > 0 order atomic page alloc in skb_page_frag_refill

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skb_page_frag_refill currently permits only order-0 page allocs
unless GFP_WAIT is used. Change skb_page_frag_refill to attempt
higher-order page allocations whether or not GFP_WAIT is used. If
memory cannot be allocated, the allocator will fall back to
successively smaller page allocs (down to order-0 page allocs).

This change brings skb_page_frag_refill in line with the existing
page allocation strategy employed by netdev_alloc_frag, which attempts
higher-order page allocations whether or not GFP_WAIT is set, falling
back to successively lower-order page allocations on failure. Part
of migration of virtio-net to per-receive queue page frag allocators.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Dalton 2014-01-16 22:23:25 -08:00 committed by David S. Miller
parent 722e47d792
commit 097b4f19e5
1 changed files with 1 additions and 3 deletions
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4
net/core/sock.c
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@ -1836,9 +1836,7 @@ bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
put_page(pfrag->page);
}
/* We restrict high order allocations to users that can afford to wait */
order = (prio & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0;
order = SKB_FRAG_PAGE_ORDER;
do {
gfp_t gfp = prio;