Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932558AbZJAOIX (ORCPT ); Thu, 1 Oct 2009 10:08:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932519AbZJAOHP (ORCPT ); Thu, 1 Oct 2009 10:07:15 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:46715 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932395AbZJAOHJ (ORCPT ); Thu, 1 Oct 2009 10:07:09 -0400 From: Suresh Jayaraman To: Linus Torvalds , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: netdev@vger.kernel.org, Neil Brown , Miklos Szeredi , Wouter Verhelst , Peter Zijlstra , trond.myklebust@fys.uio.no, Suresh Jayaraman Subject: [PATCH 19/31] netvm: filter emergency skbs. Date: Thu, 1 Oct 2009 19:38:25 +0530 Message-Id: <1254406105-16336-1-git-send-email-sjayaraman@suse.de> X-Mailer: git-send-email 1.6.0.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1099 Lines: 33 From: Peter Zijlstra 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 Signed-off-by: Suresh Jayaraman --- net/core/filter.c | 3 +++ 1 file changed, 3 insertions(+) Index: mmotm/net/core/filter.c =================================================================== --- mmotm.orig/net/core/filter.c +++ mmotm/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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/