linux-kernel - Re: skbuff truesize incorrect.

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Message-Id: <20140523.124604.1978823006121667147.davem@davemloft.net>
Date:	Fri, 23 May 2014 12:46:04 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jim_baxter@...tor.com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, kamal@...onical.com,
	bhutchings@...arflare.com, edumazet@...gle.com, mszeredi@...e.cz,
	fw@...len.de
Subject: Re: skbuff truesize incorrect.

From: Jim Baxter <jim_baxter@...tor.com>
Date: Fri, 23 May 2014 10:21:19 +0100

> On 22/05/14 21:58, David Miller wrote:
>> From: Jim Baxter <jim_baxter@...tor.com>
>> Date: Thu, 22 May 2014 21:21:55 +0100
>> 
>>> If there are multiple clones for an skb all pointing at the same data,
>>> will that distort the memory used when they all have the same truesize?
>> 
>> What is distorted about it?
>> 
>> Each clone references exactly that much backing memory.
>>
> 
> Thank you for you help, I think distorted was the wrong word.
> 
> 
> I think I am confused what truesize is used for it looks like it is used
> to deallocate memory, is this correct?

It's used to determine how much to charge sockets against their read
and write memory limits.

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