linux-kernel - Re: [Patch v1] skbuff: Hide GFP_ATOMIC page allocation failures for dropped packets

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Message-ID: <51A23825.7000303@cogentembedded.com>
Date:	Sun, 26 May 2013 20:28:21 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	atomlin@...hat.com
CC:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	pshelar@...ira.com, mst@...hat.com, alexander.h.duyck@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch v1] skbuff: Hide GFP_ATOMIC page allocation failures for
 dropped packets

Hello.

On 26-05-2013 17:17, atomlin@...hat.com wrote:

> From: Aaron Tomlin <atomlin@...hat.com>

> Failed GFP_ATOMIC allocations by the network stack result in dropped
> packets, which will be received on a subsequent retransmit, and an
> unnecessary, noisy warning with a kernel backtrace.

> These warnings are harmless, but they still cause users to panic and
> file bug reports over dropped packets. It would be better to hide the
> failed allocation warnings and backtraces, and let retransmits handle
> dropped packets quietly.

> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---
>   net/core/skbuff.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index af9185d..02139d6 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -236,7 +236,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
>   		? skbuff_fclone_cache : skbuff_head_cache;
>
>   	if (sk_memalloc_socks() && (flags & SKB_ALLOC_RX))
> -		gfp_mask |= __GFP_MEMALLOC;
> +		gfp_mask |= (__GFP_MEMALLOC|__GFP_NOWARN);

    Parens not needed here.

WBR, Sergei

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