From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH iproute2 1/2] ip: display netns name instead of nsid
Date: Mon, 4 Jun 2018 14:12:15 -0700
Message-ID: <20180604141215.0669f05f@xeon-e3>
References: <20180531114615.3f10766f@shemminger-XPS-13-9360>
        <20180604121253.2140-1-nicolas.dichtel@6wind.com>
        <20180604121253.2140-2-nicolas.dichtel@6wind.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: netdev@vger.kernel.org
To: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Return-path: <netdev-owner@vger.kernel.org>
Received: from mail-pg0-f54.google.com ([74.125.83.54]:41724 "EHLO
        mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751765AbeFDVQE (ORCPT
        <rfc822;netdev@vger.kernel.org>); Mon, 4 Jun 2018 17:16:04 -0400
Received: by mail-pg0-f54.google.com with SMTP id l65-v6so56924pgl.8
        for <netdev@vger.kernel.org>; Mon, 04 Jun 2018 14:16:04 -0700 (PDT)
In-Reply-To: <20180604121253.2140-2-nicolas.dichtel@6wind.com>
Sender: netdev-owner@vger.kernel.org
List-ID: <netdev.vger.kernel.org>

On Mon,  4 Jun 2018 14:12:52 +0200
Nicolas Dichtel <nicolas.dichtel@6wind.com> wrote:

> diff --git a/ip/ipaddress.c b/ip/ipaddress.c
> index c7c7e7df4e81..aee09c7ff6df 100644
> --- a/ip/ipaddress.c
> +++ b/ip/ipaddress.c
> @@ -819,6 +819,9 @@ int print_linkinfo(const struct sockaddr_nl *who,
>  	unsigned int m_flag = 0;
>  	SPRINT_BUF(b1);
>  
> +	netns_nsid_socket_init();
> +	netns_map_init();
> +

The idea of printing network namespace is good but I am concerned that
setting up yet another netlink socket and scanning the netns directory on
each ip link command will impact some users.

Can this setup be deferred until the first net ns lookup happens?