[PATCH -mmotm 18/30] netvm: filter emergency skbs
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From: Xiaotian Feng on 13 Jul 2010 06:30 From b0240dd1e2ee0b4dc30f98c67cfe35e8c1833753 Mon Sep 17 00:00:00 2001 From: Xiaotian Feng <dfeng(a)redhat.com> Date: Tue, 13 Jul 2010 11:36:53 +0800 Subject: [PATCH 18/30] netvm: filter emergency skbs. Toss all emergency packets not for a SOCK_MEMALLOC socket. This ensures our precious memory reserve doesn't get stuck waiting for user-space. The correctness of this approach relies on the fact that networks must be assumed lossy. Signed-off-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl> Signed-off-by: Suresh Jayaraman <sjayaraman(a)suse.de> Signed-off-by: Xiaotian Feng <dfeng(a)redhat.com> --- net/core/filter.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index 52b051f..bdcbc14 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -82,6 +82,9 @@ int sk_filter(struct sock *sk, struct sk_buff *skb) int err; struct sk_filter *filter; + if (skb_emergency(skb) && !sk_has_memalloc(sk)) + return -ENOMEM; + err = security_sock_rcv_skb(sk, skb); if (err) return err; -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |