linux-kernel - Re: GFP_ATOMIC page allocation failures.

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Message-Id: <1207134299.8514.771.camel@twins>
Date:	Wed, 02 Apr 2008 13:04:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	csnook@...hat.com, davej@...emonkey.org.uk,
	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: GFP_ATOMIC page allocation failures.

On Wed, 2008-04-02 at 01:24 -0700, David Miller wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Wed, 02 Apr 2008 17:17:50 +0900
> 
> > if network guys hope known-good driver should call 
> > __netdev_alloc_skb(dev, length, GFP_ATOMIC|__GFP_NOWARN) instead netdev_alloc_skb,
> > I think we should make netdev_alloc_skb_nowarn.
> 
> Giving it a proper name like this takes away the indication that this
> situation is very special.
> 
> Two leading underscores to an interface means "something special and
> unusual requiring more careful consideration than usual is occuring
> here."  netdev_alloc_skb_nowarn() on the other hand, does not
> convey this meaning.
> 
> And we will have very few drivers that use this construct, thus it
> really is best to handle things the way Andrew has.

Would we not hope that most net drivers can handle {,net}dev_alloc_skb()
failing? Otherwise we have some serious trouble.

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