| Date | Thu, 02 Oct 2008 15:05:26 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 22/32] netvm: filter emergency skbs. |
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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@chello.nl> --- net/core/filter.c | 3 +++ 1 file changed, 3 insertions(+)
Index: linux-2.6/net/core/filter.c =================================================================== --- linux-2.6.orig/net/core/filter.c +++ linux-2.6/net/core/filter.c @@ -81,6 +81,9 @@ int sk_filter(struct sock *sk, struct sk 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; --
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