From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id 011F5600034 for ; Thu, 1 Oct 2009 09:28:46 -0400 (EDT) From: 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> Sender: owner-linux-mm@kvack.org 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 List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org