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Date: Thu, 16 Jan 2014 11:52:25 -0800 From: Michael Dalton <mwdalton@...gle.com> To: "David S. Miller" <davem@...emloft.net> Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>, Rusty Russell <rusty@...tcorp.com.au>, "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, Ben Hutchings <bhutchings@...arflare.com>, virtualization@...ts.linux-foundation.org, Michael Dalton <mwdalton@...gle.com> Subject: [PATCH net-next v4 1/6] net: allow > 0 order atomic page alloc in skb_page_frag_refill 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@...hat.com> Acked-by: Eric Dumazet <edumazet@...gle.com> Signed-off-by: Michael Dalton <mwdalton@...gle.com> --- net/core/sock.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/net/core/sock.c b/net/core/sock.c index 85ad6f0..b3f7ee3 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -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; -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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