From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Denis V. Lunev" <den-3ImXcnM4P+0@public.gmane.org>
Subject: Re: Pid namespaces problems
Date: Thu, 08 Nov 2007 16:43:06 +0300
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To: Daniel Lezcano <dlezcano-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Cc: Cedric Le Goater <clg-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>, "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>, Linux Containers <containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org>, "Denis V. Lunev" <den-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>, Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>, Benjamin Thery <benjamin.thery-6ktuUTfB/bM@public.gmane.org>
List-Id: containers.vger.kernel.org

Daniel Lezcano wrote:
> Denis V. Lunev wrote:
>> Daniel Lezcano wrote:
>>
>>>  * the first one is the locking of the network namespace list by
>>> rtnl_lock, so from the timer callback we can not browse the network
>>> namespace list to check the age of the routes. It is a problem I would
>>> like to talk with Denis if he has time
>>
>> From my point of view, the situation is clear. The timer should be
>> per/namespace. The situation is completely different as one in IPv4.
> 
> We thought to make a timer per namespace for ipv6, but we are a little
> afraid for the performances when there will be a lot of containers.
> Anyway, we can do a timer per namespace and optimize that later. I will
> cook a new patch to take into account that for the next week.

IMHO not a problem. tcp_write_timer is per/socket timer. If this works
efficiently, per/namespace one will work also.