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authorEric Dumazet <edumazet@google.com>2015-04-22 07:33:36 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-06 21:59:07 +0200
commitd810156278d9b5fe9b1034da3fce1a28219ab9ee (patch)
tree08339b8640073be92ad2130a4d316c99009222ae /net
parent4fbc90829691a912bb47f6f66bfbfccf654c81fb (diff)
downloadlinux-linaro-stable-d810156278d9b5fe9b1034da3fce1a28219ab9ee.tar.gz
net: do not deplete pfmemalloc reserve
[ Upstream commit 79930f5892e134c6da1254389577fffb8bd72c66 ] build_skb() should look at the page pfmemalloc status. If set, this means page allocator allocated this page in the expectation it would help to free other pages. Networking stack can do that only if skb->pfmemalloc is also set. Also, we must refrain using high order pages from the pfmemalloc reserve, so __page_frag_refill() must also use __GFP_NOMEMALLOC for them. Under memory pressure, using order-0 pages is probably the best strategy. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/core/skbuff.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index e2b1bba69882..8334c7048bbd 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -309,7 +309,11 @@ struct sk_buff *build_skb(void *data, unsigned int frag_size)
memset(skb, 0, offsetof(struct sk_buff, tail));
skb->truesize = SKB_TRUESIZE(size);
- skb->head_frag = frag_size != 0;
+ if (frag_size) {
+ skb->head_frag = 1;
+ if (virt_to_head_page(data)->pfmemalloc)
+ skb->pfmemalloc = 1;
+ }
atomic_set(&skb->users, 1);
skb->head = data;
skb->data = data;
@@ -352,7 +356,8 @@ refill:
gfp_t gfp = gfp_mask;
if (order)
- gfp |= __GFP_COMP | __GFP_NOWARN;
+ gfp |= __GFP_COMP | __GFP_NOWARN |
+ __GFP_NOMEMALLOC;
nc->frag.page = alloc_pages(gfp, order);
if (likely(nc->frag.page))
break;