netdev - Re: [RFC/PATCH 3/3] UDP memory usage accounting (take 2): measurement

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Date:	Mon, 01 Oct 2007 22:52:27 +0900
From:	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev <netdev@...r.kernel.org>,
	?? ?? <yoshfuji@...ux-ipv6.org>,
	Yumiko SUGITA <yumiko.sugita.yf@...achi.com>,
	"??@...Hat" <haoki@...hat.com>,
	David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC/PATCH 3/3] UDP memory usage accounting (take 2): measurement

Evgeniy Polyakov wrote:
> On Fri, Sep 28, 2007 at 10:41:31PM +0900, Satoshi OSHIMA
(satoshi.oshima.fk@...achi.com) wrote:
>> This patch introduces memory usage measurement for UDP.
>>
>> These 3 points were updated.
>>
>> - UDP specific codes in IP layer were removed.
>>
>> - atomic_sub() in a loop was removed
>>
>> - accounting during socket destruction
>
> Another approach is to account only at the highest UDP layer and having
> datagram skb destructor just like it is done in TCP, but this approach
> is also resonable.


This patch set try to introduce a memory accounting by the page
because TCP does. And ip_append_data() merges payloads to a sk_buff
if previous sk_buff has enough space. The problem is that
udp_append_data() doesn't recognize whether this merge happens or not.

If the accounting must be in UDP layer, we need to change
the interface of ip_append_data() to know this merge happens.

Once the interface is changed, we have to maintain other
protocol stacks to keep up with the change.

But I didn't want to do it to keep this patch set small
in the first step.


> I already told that patches 1 and 3 have broken indent, please fix that.

Oops! I will fix that.


> A hint: when you are about to submit something network related for
inclusion,
> and strongly believes it is ready, it can be a not that bad idea to add
> David Miller <davem@...emloft.net> to copy list, he can complain about
> backlog and so on, but will read you mail twice :) but do not tell anyone.

Thank you for your advice. I will do that!

Satoshi Oshima
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