netdev - Re: [PATCH 8/8] net: Implement socketat.

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Message-ID: <4C9B495D.70200@parallels.com>
Date:	Thu, 23 Sep 2010 16:34:37 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	hadi@...erus.ca, "Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.osdl.org>,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Ulrich Drepper <drepper@...il.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	David Miller <davem@...emloft.net>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Ben Greear <greearb@...delatech.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 8/8] net: Implement socketat.

On 09/23/2010 04:11 PM, jamal wrote:
> On Thu, 2010-09-23 at 15:53 +0400, Pavel Emelyanov wrote:
> 
>> Why does it matter? You told, that the usage scenario was to
>> add routes to container. If I do 2 syscalls instead of 1, is
>> it THAT worse?
>>
> 
> Anything to do with socket IO that requires namespace awareness
> applies for usage; it could be tcp/udp/etc socket. If it doesnt
> make any difference performance wise using one scheme vs other
> to write/read heavy messages then i dont see an issue and socketat
> is redundant.

That's what my point is about - unless we know why would we need it
we don't need it.

Eric, please clarify, what is the need in creating a socket in foreign
net namespace?
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