linux-kernel - Re: [RFC][PATCH 2/9] deadlock prevention core

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Message-ID: <44D976E6.5010106@google.com>
Date:	Tue, 08 Aug 2006 22:47:18 -0700
From:	Daniel Phillips <phillips@...gle.com>
To:	David Miller <davem@...emloft.net>
CC:	tgraf@...g.ch, a.p.zijlstra@...llo.nl, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC][PATCH 2/9] deadlock prevention core

David Miller wrote:
> From: Daniel Phillips <phillips@...gle.com>
  >>Can you please characterize the conditions under which skb->dev changes
>>after the alloc?  Are there writings on this subtlety?
> 
> The packet scheduler and classifier can redirect packets to different
> devices, and can the netfilter layer.
> 
> The setting of skb->dev is wholly transient and you cannot rely upon
> it to be the same as when you set it on allocation.
>
> Even simple things like the bonding device change skb->dev on every
> receive.

Thankyou, this is easily fixed.

> I think you need to study the networking stack a little more before
> you continue to play in this delicate area :-)

The VM deadlock is also delicate.  Perhaps we can work together.

Regards,

Daniel
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