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net: don't bother calling list RX functions on empty lists
Generally the check should be very cheap, as the sk_buff_head is in cache. Signed-off-by: Edward Cree <ecree@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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5fa12739a5
commit
b9f463d6c9
1 changed files with 6 additions and 2 deletions
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@ -4887,7 +4887,8 @@ static void __netif_receive_skb_list(struct list_head *head)
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/* Handle the previous sublist */
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list_cut_before(&sublist, head, &skb->list);
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__netif_receive_skb_list_core(&sublist, pfmemalloc);
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if (!list_empty(&sublist))
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__netif_receive_skb_list_core(&sublist, pfmemalloc);
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pfmemalloc = !pfmemalloc;
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/* See comments in __netif_receive_skb */
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if (pfmemalloc)
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@ -4897,7 +4898,8 @@ static void __netif_receive_skb_list(struct list_head *head)
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}
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}
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/* Handle the remaining sublist */
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__netif_receive_skb_list_core(head, pfmemalloc);
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if (!list_empty(head))
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__netif_receive_skb_list_core(head, pfmemalloc);
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/* Restore pflags */
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if (pfmemalloc)
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memalloc_noreclaim_restore(noreclaim_flag);
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@ -5058,6 +5060,8 @@ void netif_receive_skb_list(struct list_head *head)
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{
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struct sk_buff *skb;
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if (list_empty(head))
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return;
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list_for_each_entry(skb, head, list)
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trace_netif_receive_skb_list_entry(skb);
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netif_receive_skb_list_internal(head);
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