Messages in this thread Patch in this message |  | | | Date | Fri, 14 Dec 2007 16:39:25 +0100 | | From | Peter Zijlstra <> | | Subject | [PATCH 18/29] 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> --- 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 @@ -930,6 +930,9 @@ 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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