OpenVZ Forum


Home » Mailing lists » Devel » containers development plans (July 10 version)
Re: containers development plans (July 10 version) [message #14925 is a reply to message #14796] Fri, 13 July 2007 13:10 Go to previous messageGo to previous message
dev is currently offline  dev
Messages: 1693
Registered: September 2005
Location: Moscow
Senior Member
Paul Menage wrote:
> On 7/10/07, Serge E. Hallyn <serge@hallyn.com> wrote:
>
>>A (still under construction) list of features we expect to be worked on
>>next year looks like this:
>> 4. task containers functionality
>> specific containers
>
>
> A couple of more container subsystem requests that have come out of
> the Linux Foundation Japan symposium, although I think they've also
> been mentioned before more than once - per-container swap and disk I/O
> scheduling.
>
> I'm not familiar enough with the current Linux disk scheduler code to
> know how easy/hard it is to add rate guarantees on a per-container
> basis, but the swap one should be easier.

Paul, OpenVZ implements 2-level disk I/O scheduler based on CFQ.
It is not that hard to implement and we will propose the patches
a bit later based on your containers stuff.

However, there is one big problem which I'm not sure mainstream
is ready to go with. Writes. Writes are usually asynchronous
and it is impossible to say which container caused the write
when it goes to the scheduler.
OpenVZ solves this by tracking dirty pages and context which made them dirty.
But it is a next step after std CFQ modifying.

> One potential issue with the swap container is how integrated should
> it be with the memory controller? I can certainly see people wanting
> to be able to use a swap controller without requiring a page-based
> memory controller (e.g. you might want to combine it with node-based
> control via cpusets instead) but adding two pointers to the mm_struct,
> one for swap controller subsystem and one for memory controller
> subsystem, seems a little bit ugly.

Thanks,
Kirill

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [PATCH 1/6] Define and use task_active_pid_ns() wrapper
Next Topic: [PATCH 2/6] Rename pid_nr function
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Thu Mar 19 19:44:45 GMT 2026

Total time taken to generate the page: 1.14995 seconds
Powered by FUDforum Powered by Virtuozzo Containers