>From b0240dd1e2ee0b4dc30f98c67cfe35e8c1833753 Mon Sep 17 00:00:00 2001 From: Xiaotian Feng <dfeng@xxxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Suresh Jayaraman <sjayaraman@xxxxxxx> Signed-off-by: Xiaotian Feng <dfeng@xxxxxxxxxx> --- 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>