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Re: [PATCH 1/4] Virtualization/containers: introduction [message #1402 is a reply to message #1401]

Tue, 07 February 2006 23:18

Hubertus Franke
Messages: 16
Registered: February 2006

Junior Member

Sam Vilain wrote:
> Hubertus Franke wrote:
>
>> The container is just an umbrella object that ties every "virtualized"
>> subsystem together.
>
>
> I like this description; it matches roughly with the concepts as
> presented by vserver; there is the process virtualisation (vx_info), and
> the network virtualisation (nx_info) of Eric's that has been integrated
> to the vserver 2.1.x development branch. However the vx_info has become
> the de facto umbrella object space as well. These could almost
> certainly be split out without too much pain or incurring major
> rethinks.
>
> Sam.
>

Agreed.. here are some issued we learned from other projects that had
similar interception points.

Having a central umbrella object (let's stick to the name container)
is useful, but being the only object through which every access has to
pass may have drawbacks..

task->container->pspace->pidmap[offset].page implies potential
cachemisses etc.

If overhead becomes too large, then we can stick (cache) the pointer
additionally in the task struct. But ofcourse that should be carefully
examined on a per subsystem base...

==
Another thing to point out is that container's can have overlaps.

C/R should be a policy thing. So if each "subsystem"

> Quote Eric>>>
> PIDS
> UIDS
> SYSVIPC
> NETWORK
> UTSNAME
> FILESYSTEM

is represented as a NAMESPACE, then one can pick and choose as a
policy how these constitute at a conceptual level as a container.
You want something migratable you better make sure that
container implies unique subsystems.
Maybe you want to nest containers, but only want to create a
separate pidspaces for performance isolation (see planetlab work
with vserver).
So, there are many possibilities, that might make perfect sense
for different desired solutions and it seems with the
clone ( CLONE_FLAGS_NSPACE_[PIDS/UIDS/SYS.../FS] ) one gets a solution
that is flexible, yet embodies may requirements.....

-- Hubertus

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[Message index]

		[PATCH 1/4] Virtualization/containers: introduction By: Kirill Korotaev on Mon, 06 February 2006 21:55
		[PATCH 2/4] Virtualization/containers: CONFIG_CONTAINER By: Kirill Korotaev on Mon, 06 February 2006 22:10
		[PATCH 3/4] Virtualization/containers: UID hash By: Kirill Korotaev on Mon, 06 February 2006 22:15
		[PATCH 4/4] Virtualization/containers: uts name By: Kirill Korotaev on Mon, 06 February 2006 22:20
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Dave Hansen on Mon, 06 February 2006 23:00
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Tue, 07 February 2006 12:22
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 03:34
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Rik van Riel on Tue, 07 February 2006 03:40
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Sam Vilain on Tue, 07 February 2006 06:30
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Tue, 07 February 2006 11:49
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 14:31
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 15:42
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Tue, 07 February 2006 16:16
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 17:20
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Sam Vilain on Tue, 07 February 2006 22:43
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Tue, 07 February 2006 16:57
		Re: [PATCH 1/4] Virtualization/containers: introduction By: serue on Tue, 07 February 2006 20:19
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Tue, 07 February 2006 20:46
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 22:00
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Tue, 07 February 2006 22:19
		The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Tue, 07 February 2006 22:06
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Hubertus Franke on Tue, 07 February 2006 23:35
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Alexey Kuznetsov on Wed, 08 February 2006 00:43
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 02:49
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: serue on Wed, 08 February 2006 03:36
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 05:23
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Hubertus Franke on Wed, 08 February 2006 14:40
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 17:46
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 22:28
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: serue on Wed, 08 February 2006 15:17
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: serue on Wed, 08 February 2006 18:03
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: dev on Mon, 20 February 2006 12:08
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Herbert Poetzl on Mon, 20 February 2006 12:40
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: dev on Mon, 20 February 2006 14:25
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Herbert Poetzl on Mon, 20 February 2006 15:16
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Andi Kleen on Mon, 20 February 2006 15:17
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 03:52
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Herbert Poetzl on Wed, 08 February 2006 04:37
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 04:46
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Herbert Poetzl on Wed, 08 February 2006 04:56
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: serue on Wed, 08 February 2006 14:38
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Hubertus Franke on Wed, 08 February 2006 14:51
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: dev on Wed, 08 February 2006 15:34
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Hubertus Franke on Wed, 08 February 2006 15:57
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Herbert Poetzl on Wed, 08 February 2006 19:02
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Wed, 08 February 2006 16:48
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Hubertus Franke on Wed, 08 February 2006 18:31
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Dave Hansen on Wed, 08 February 2006 20:21
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: serue on Wed, 08 February 2006 21:22
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Thu, 09 February 2006 05:41
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: Kyle Moffett on Thu, 09 February 2006 04:45
		Re: The issues for agreeing on a virtualization/namespaces implementation. By: ebiederm on Thu, 09 February 2006 22:25
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Sam Vilain on Tue, 07 February 2006 22:58
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Tue, 07 February 2006 23:18
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Wed, 08 February 2006 05:03
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Wed, 08 February 2006 14:13
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Wed, 08 February 2006 15:42
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Wed, 08 February 2006 16:39
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Kevin Fox on Wed, 08 February 2006 02:08
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Wed, 08 February 2006 15:35
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Wed, 08 February 2006 17:16
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Dave Hansen on Wed, 08 February 2006 20:43
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Wed, 08 February 2006 21:04
		Re: [PATCH 1/4] Virtualization/containers: introduction By: dev on Tue, 07 February 2006 12:12
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 14:06
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Rik van Riel on Tue, 07 February 2006 14:52
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Tue, 07 February 2006 15:13
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Sam Vilain on Wed, 08 February 2006 01:16
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Paul Jackson on Wed, 08 February 2006 04:21
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Thu, 09 February 2006 00:24
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Jeff Dike on Thu, 09 February 2006 02:18
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Thu, 09 February 2006 03:16
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Hubertus Franke on Thu, 09 February 2006 16:38
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Jeff Dike on Thu, 09 February 2006 17:47
		Re: [PATCH 1/4] Virtualization/containers: introduction By: Sam Vilain on Thu, 09 February 2006 22:09
		Re: [PATCH 1/4] Virtualization/containers: introduction By: ebiederm on Thu, 09 February 2006 21:56

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