* [PATCH 19/31] netvm: filter emergency skbs.
@ 2009-10-01 14:08 Suresh Jayaraman
0 siblings, 0 replies; only message in thread
From: Suresh Jayaraman @ 2009-10-01 14:08 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton, linux-kernel, linux-mm
Cc: netdev, Neil Brown, Miklos Szeredi, Wouter Verhelst,
Peter Zijlstra, trond.myklebust, Suresh Jayaraman
From: Peter Zijlstra <a.p.zijlstra@chello.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@chello.nl>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.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;
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