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    Subject[PATCH 20/30] 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@chello.nl>
    ---
    include/net/sock.h | 3 +++
    1 file changed, 3 insertions(+)

    Index: linux-2.6/include/net/sock.h
    ===================================================================
    --- linux-2.6.orig/include/net/sock.h
    +++ linux-2.6/include/net/sock.h
    @@ -1007,6 +1007,9 @@ static inline int sk_filter(struct sock
    {
    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)
    --



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