netdev - [PATCH RFC net-next 1/2] net: skbuff: propagate pfmemalloc to skb

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Date:	Sun, 24 Aug 2014 03:07:18 +0530
From:	Govindarajulu Varadarajan <_govind@....com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, edumazet@...gle.com, mgorman@...e.de,
	Govindarajulu Varadarajan <_govind@....com>
Subject: [PATCH RFC net-next 1/2] net: skbuff: propagate pfmemalloc to skb

In __netdev_alloc_skb, __netdev_alloc_frag might have allocated page with
flag __GFP_MEMALLOC. But we do not propagate it to the skb.

Signed-off-by: Govindarajulu Varadarajan <_govind@....com>
---
 net/core/skbuff.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 163b673..51a3328 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -425,8 +425,14 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
 
 		if (likely(data)) {
 			skb = build_skb(data, fragsz);
-			if (unlikely(!skb))
+			if (unlikely(!skb)) {
 				put_page(virt_to_head_page(data));
+			} else {
+				struct page *page;
+
+				page = virt_to_head_page(data);
+				skb_propagate_pfmemalloc(page, skb);
+			}
 		}
 	} else {
 		skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask,
-- 
2.1.0

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