netdev - Re: [PATCH 1/2] bnx2: allocate with GFP

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Date:	Thu, 15 Jul 2010 22:57:08 -0700
From:	Mitchell Erblich <erblichs@...thlink.net>
To:	David Miller <davem@...emloft.net>
Cc:	mchan@...adcom.com, sgruszka@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] bnx2: allocate with GFP_KERNEL flag on RX path init


On Jul 15, 2010, at 8:25 PM, David Miller wrote:

> From: "Michael Chan" <mchan@...adcom.com>
> Date: Thu, 15 Jul 2010 07:48:40 -0700
> 
>> Stanislaw Gruszka wrote:
>> 
>>> Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
>>> ---
>>> @@ -2974,7 +2974,7 @@ bnx2_rx_skb(struct bnx2 *bp, struct
>>> bnx2_rx_ring_info *rxr, struct sk_buff *skb,
>>>      int err;
>>>      u16 prod = ring_idx & 0xffff;
>>> 
>>> -     err = bnx2_alloc_rx_skb(bp, rxr, prod);
>>> +     err = bnx2_alloc_rx_skb(bp, rxr, prod, GFP_KERNEL);
>> 
>> This should be GFP_ATOMIC since it is called from NAPI softirq
>> context.
> 
> This fatal issue gives me doubts about whether this patch was even
> tested at all.
> 
> Immediately the kernel memory allocator should have issued a warning
> due to this GFP_KERNEL allocation in a non-sleep'able context.
> 
> Stanislaw, how did you test this patch?
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Group,

		Why NOT GFP_NOWAIT. This won't use the last resource pages
		versus GFP_ATOMIC?

		GFP_ATOMIC IMO, SHOULD be used in the paths that cleans
		and frees pages.

Mitchell Erblich


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