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Message-Id: <1254406105-16336-1-git-send-email-sjayaraman@suse.de> Date: Thu, 1 Oct 2009 19:38:25 +0530 From: Suresh Jayaraman <sjayaraman@...e.de> To: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: netdev@...r.kernel.org, Neil Brown <neilb@...e.de>, Miklos Szeredi <mszeredi@...e.cz>, Wouter Verhelst <w@...r.be>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, trond.myklebust@....uio.no, Suresh Jayaraman <sjayaraman@...e.de> Subject: [PATCH 19/31] netvm: filter emergency skbs. From: Peter Zijlstra <a.p.zijlstra@...llo.nl> 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@...llo.nl> Signed-off-by: Suresh Jayaraman <sjayaraman@...e.de> --- 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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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