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Re: [PATCH 0/9] namespaces: Introduction [message #3277 is a reply to message #3275]

Fri, 19 May 2006 16:27

ebiederm
Messages: 1354
Registered: February 2006

Senior Member

Andrew Morton <akpm@osdl.org> writes:

> Herbert Poetzl <herbert@13thfloor.at> wrote:
>>
>> let me
>> give a simple example here:
>
> Examples are useful.
>
>> "pid virtualization"
>>
>> - Linux-VServer doesn't really need that right now.
>> we are perfectly fine with "pid isolation" here, we
>> only "virtualize" the init pid to make pstree happy
>>
>> - Snapshot/Restart and Migration will require "full"
>> pid virtualization (that's where Eric and OpenVZ
>> are heading towards)
>
> snapshot/restart/migration worry me. If they require complete
> serialisation of complex kernel data structures then we have a problem,
> because it means that any time anyone changes such a structure they need to
> update (and test) the serialisation.

There is a strict limit to what is user visible, and if it isn't user visible
we will never need it in a checkpoint. So internal implementation details
should not matter.

> This may be a show-stopper, in which case maybe we only need to virtualise
> pid #1.

Except we do need something for pid isolation, and a pid namespace is
quite possibly the light weight solution. If you can't see the pid it is
clearly isolated from you.

> Anyway. Thanks, guys. It sound like most of this work will be nicely
> separable so we can think about each bit as it comes along.

Yes, and there are enough issues it is significant.

Eric

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[Message index]

		Re: [PATCH 0/9] namespaces: Introduction By: Andrew Morton on Thu, 18 May 2006 17:34
		Re: [PATCH 0/9] namespaces: Introduction By: John Kelly on Thu, 18 May 2006 19:23
		Re: [PATCH 0/9] namespaces: Introduction By: Sam Vilain on Thu, 18 May 2006 23:28
		Re: [PATCH 0/9] namespaces: Introduction By: Paul Jackson on Fri, 19 May 2006 04:24
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Fri, 19 May 2006 09:23
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Fri, 19 May 2006 11:41
		Re: [PATCH 0/9] namespaces: Introduction By: Jeff Dike on Fri, 19 May 2006 17:52
		Re: [PATCH 0/9] namespaces: Introduction By: Sam Vilain on Sat, 20 May 2006 00:16
		Re: [PATCH 0/9] namespaces: Introduction By: Herbert Poetzl on Fri, 19 May 2006 12:42
		Re: [PATCH 0/9] namespaces: Introduction By: Andrew Morton on Fri, 19 May 2006 15:13
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Fri, 19 May 2006 16:27
		Re: [PATCH 0/9] namespaces: Introduction By: Andrew Morton on Fri, 19 May 2006 16:40
		Re: [PATCH 0/9] namespaces: Introduction By: Dave Hansen on Fri, 19 May 2006 20:17
		RE: [PATCH 0/9] namespaces: Introduction By: Hua Zhong on Fri, 19 May 2006 18:28
		Re: [PATCH 0/9] namespaces: Introduction By: Dave Hansen on Fri, 19 May 2006 20:04
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Sat, 20 May 2006 03:18
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Sun, 21 May 2006 00:48
		Re: [PATCH 0/9] namespaces: Introduction By: Pavel Machek on Sun, 21 May 2006 22:57
		Re: [PATCH 0/9] namespaces: Introduction By: Andrey Savochkin on Fri, 19 May 2006 13:47
		Re: [PATCH 0/9] namespaces: Introduction By: Andrew Morton on Fri, 19 May 2006 15:25
		Re: [PATCH 0/9] namespaces: Introduction By: Herbert Poetzl on Sat, 20 May 2006 21:24
		Re: [PATCH 0/9] namespaces: Introduction By: ebiederm on Mon, 22 May 2006 17:23
		Re: [PATCH 0/9] namespaces: Introduction By: Sam Vilain on Sat, 20 May 2006 00:16

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