netdev - Re: [RFC PATCH net-next v3 1/4] netns: add genl cmd to add and get peer netns ids

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Message-ID: <87tx3mmflp.fsf@x220.int.ebiederm.org>
Date:	Thu, 02 Oct 2014 12:33:22 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	davem@...emloft.net, stephen@...workplumber.org,
	akpm@...ux-foundation.org, luto@...capital.net,
	cwang@...pensource.com
Subject: Re: [RFC PATCH net-next v3 1/4] netns: add genl cmd to add and get peer netns ids

Nicolas Dichtel <nicolas.dichtel@...nd.com> writes:

> With this patch, a user can define an id for a peer netns by providing a FD or a
> PID. These ids are local to netns (ie valid only into one netns).
>
> This will be useful for netlink messages when a x-netns interface is
> dumped.

You have a "id -> struct net *" table but you don't have a 
"struct net * -> id" table which looks like it will impact the
performance of peernet2id at scale.

Eric
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