netdev - Re: [PATCH net-next] skbuff: update sk truesize in pskb_expand

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Date:	Sat, 15 Oct 2011 11:52:22 +0800
From:	RongQing Li <roy.qing.li@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] skbuff: update sk truesize in pskb_expand_head

2011/10/14 David Miller <davem@...emloft.net>:
> From: roy.qing.li@...il.com
> Date: Fri, 14 Oct 2011 15:39:30 +0800
>
>> when pskb_expand_head reallocates header of &sk_buff, the sk
>> truesize should be updated simultaneously
>>
>> Signed-off-by: RongQing.Li <roy.qing.li@...il.com>
>
> I know you did not test this patch at all.
>
> You can't modify the truesize because packets passed to this routine
> are often attached to a socket, thus if you change the truesize the
> socket memory accouting will be adjusted incorrectly later when the
> SKB is freed up.
>
> Most SKB modifying functions have to operate with this restriction.
>
>

I am sorry I do not know how to test it in fact.

But I believe the adjustment is right here
About incorrectly impact on socket, I am consider it, but I still no
idea about it.

Thanks.
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