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Re: [PATCH] BC: resource beancounters (v2) [message #5763 is a reply to message #5747]

Tue, 29 August 2006 17:08

Balbir Singh
Messages: 491
Registered: August 2006

Senior Member

Kirill Korotaev wrote:
>>> ------------- cut ----------------
>>> The task of limiting a container to 4.5GB of memory bottles down to the
>>> question: what to do when the container starts to use more than assigned
>>> 4.5GB of memory?
>>>
>>> At this moment there are only 3 viable alternatives.
>>>
>>> A) Have separate memory management for each container,
>>> with separate buddy allocator, lru lists, page replacement mechanism.
>>> That implies a considerable overhead, and the main challenge there
>>> is sharing of pages between these separate memory managers.
>>>
>>> B) Return errors on extension of mappings, but not on page faults, where
>>> memory is actually consumed.
>>> In this case it makes sense to take into account not only the size
>>> of used
>>> memory, but the size of created mappings as well.
>>> This is approximately what "privvmpages" accounting/limiting
>>> provides in
>>> UBC.
>>>
>>> C) Rely on OOM killer.
>>> This is a fall-back method in UBC, for the case "privvmpages" limits
>>> still leave the possibility to overload the system.
>>>
>>
>>
>> D) Virtual scan of mm's in the over-limit container
>>
>> E) Modify existing physical scanner to be able to skip pages which
>> belong to not-over-limit containers.
>>
>> F) Something else ;)
> We fully agree that other possible algorithms can and should exist.
> My idea only is that any of them would need accounting anyway
> (which is the most part of beancounters).
> Throtling, modified scanners etc. can be implemented as a separate
> BC parameters. Thus, an administrator will be able to select
> which policy should be applied to the container which is near its limit.
>
> So the patches I'm trying to send are a step-by-step accounting of all
> the resources and their simple limitations. More comprehensive limitation
> policy will be built on top of it later.
>

One of the issues I see is that bean counters are not very flexible. Tasks
cannot change bean counters dynamically after fork()/exec() that is - can they?

> BTW, UBC page beancounters allow to distinguish pages used by only one
> container and pages which are shared. So scanner can try to reclaim
> container private pages first, thus not influencing other containers.
>

But can you select the specific container for which we intend to scan pages?

> Thanks,
> Kirill
>

--
Thanks,
Balbir Singh,
Linux Technology Center,
IBM Software Labs

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[Message index]

		[PATCH] BC: resource beancounters (v2) By: dev on Wed, 23 August 2006 10:44
		[PATCH 1/6] BC: kconfig By: dev on Wed, 23 August 2006 10:59
		Re: [PATCH 1/6] BC: kconfig By: Alexey Dobriyan on Wed, 23 August 2006 13:04
		Re: [PATCH 1/6] BC: kconfig By: Dave Hansen on Wed, 23 August 2006 22:04
		Re: [PATCH 1/6] BC: kconfig By: Matt Helsley on Wed, 23 August 2006 22:13
		Re: [PATCH 1/6] BC: kconfig By: dev on Fri, 25 August 2006 11:27
		Re: [PATCH 1/6] BC: kconfig By: dev on Fri, 25 August 2006 11:31
		Re: [PATCH 1/6] BC: kconfig By: rdunlap on Wed, 23 August 2006 22:29
		Re: [PATCH 1/6] BC: kconfig By: Matt Helsley on Wed, 23 August 2006 22:27
		Re: [PATCH 1/6] BC: kconfig By: Chandra Seetharaman on Thu, 24 August 2006 00:23
		Re: [ckrm-tech] [PATCH 1/6] BC: kconfig By: dev on Thu, 24 August 2006 11:47
		Re: [ckrm-tech] [PATCH 1/6] BC: kconfig By: Matt Helsley on Thu, 24 August 2006 22:23
		[PATCH 2/6] BC: beancounters core (API) By: dev on Wed, 23 August 2006 11:00
		Re: [PATCH 2/6] BC: beancounters core (API) By: Andi Kleen on Wed, 23 August 2006 11:37
		Re: [PATCH 2/6] BC: beancounters core (API) By: dev on Wed, 23 August 2006 13:25
		Re: [PATCH 2/6] BC: beancounters core (API) By: Andi Kleen on Wed, 23 August 2006 13:48
		Re: [PATCH 2/6] BC: beancounters core (API) By: dev on Wed, 23 August 2006 13:46
		Re: [PATCH 2/6] BC: beancounters core (API) By: Alexey Dobriyan on Wed, 23 August 2006 13:53
		Re: [PATCH 2/6] BC: beancounters core (API) By: Matt Helsley on Wed, 23 August 2006 22:05
		Re: [PATCH 2/6] BC: beancounters core (API) By: Alexey Dobriyan on Wed, 23 August 2006 13:30
		Re: [PATCH 2/6] BC: beancounters core (API) By: Andrew Morton on Wed, 23 August 2006 16:42
		Re: [PATCH 2/6] BC: beancounters core (API) By: Oleg Nesterov on Thu, 24 August 2006 11:09
		Re: [PATCH 2/6] BC: beancounters core (API) By: dev on Thu, 24 August 2006 12:03
		Re: [PATCH 2/6] BC: beancounters core (API) By: Andrew Morton on Thu, 24 August 2006 15:00
		Re: [PATCH 2/6] BC: beancounters core (API) By: dev on Fri, 25 August 2006 10:51
		Re: [PATCH 2/6] BC: beancounters core (API) By: Oleg Nesterov on Thu, 24 August 2006 17:09
		[PATCH 3/6] BC: context inheriting and changing By: dev on Wed, 23 August 2006 11:02
		[PATCH 4/6] BC: user interface (syscalls) By: dev on Wed, 23 August 2006 11:03
		Re: [PATCH 4/6] BC: user interface (syscalls) By: dev on Wed, 23 August 2006 13:40
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Andrew Morton on Wed, 23 August 2006 16:50
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Alan Cox on Wed, 23 August 2006 17:08
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Andrew Morton on Thu, 24 August 2006 04:35
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Alan Cox on Thu, 24 August 2006 10:42
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Alexey Dobriyan on Thu, 24 August 2006 13:08
		Re: [PATCH 4/6] BC: user interface (syscalls) By: dev on Fri, 25 August 2006 10:54
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Alexey Dobriyan on Wed, 23 August 2006 13:41
		Re: [PATCH 4/6] BC: user interface (syscalls) By: Chandra Seetharaman on Thu, 24 August 2006 00:30
		[PATCH 5/6] BC: kernel memory accounting (core) By: dev on Wed, 23 August 2006 11:04
		Re: [PATCH 5/6] BC: kernel memory accounting (core) By: Chandra Seetharaman on Thu, 24 August 2006 00:36
		Re: [PATCH 5/6] BC: kernel memory accounting (core) By: Oleg Nesterov on Thu, 24 August 2006 16:59
		Re: [PATCH 5/6] BC: kernel memory accounting (core) By: dev on Fri, 25 August 2006 10:06
		[PATCH 6/6] BC: kernel memory accounting (marks) By: dev on Wed, 23 August 2006 11:05
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: Dave Hansen on Wed, 23 August 2006 18:30
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: dev on Tue, 29 August 2006 09:52
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: Dave Hansen on Tue, 29 August 2006 15:48
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: Dave Hansen on Wed, 23 August 2006 23:03
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: Geert Uytterhoeven on Thu, 24 August 2006 09:30
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: Dave Hansen on Thu, 24 August 2006 15:52
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: dev on Tue, 29 August 2006 14:34
		Re: [PATCH 6/6] BC: kernel memory accounting (marks) By: dev on Tue, 29 August 2006 15:53
		Re: [PATCH] BC: resource beancounters (v2) By: Andrew Morton on Wed, 23 August 2006 17:05
		Re: [PATCH] BC: resource beancounters (v2) By: Chandra Seetharaman on Thu, 24 August 2006 00:17
		Re: [PATCH] BC: resource beancounters (v2) By: dev on Fri, 25 August 2006 11:47
		Re: [PATCH] BC: resource beancounters (v2) By: Andrew Morton on Fri, 25 August 2006 14:30
		Re: [PATCH] BC: resource beancounters (v2) By: Andi Kleen on Fri, 25 August 2006 14:48
		Re: [PATCH] BC: resource beancounters (v2) By: dev on Mon, 28 August 2006 08:27
		Re: [PATCH] BC: resource beancounters (v2) By: Nick Piggin on Fri, 25 August 2006 15:14
		Re: BC: resource beancounters (v2) By: Andrey Savochkin on Fri, 25 August 2006 16:30
		Re: BC: resource beancounters (v2) By: Andrew Morton on Fri, 25 August 2006 17:50
		Re: BC: resource beancounters (v2) By: Chandra Seetharaman on Fri, 25 August 2006 19:00
		Re: BC: resource beancounters (v2) By: Rohit Seth on Sat, 26 August 2006 02:15
		Re: BC: resource beancounters (v2) By: Alan Cox on Sat, 26 August 2006 16:16
		Re: BC: resource beancounters (v2) By: Rohit Seth on Mon, 28 August 2006 16:48
		Re: Re: BC: resource beancounters (v2) By: kir on Mon, 28 August 2006 17:40
		Re: Re: BC: resource beancounters (v2) By: Rohit Seth on Mon, 28 August 2006 22:28
		Re: Re: BC: resource beancounters (v2) By: Alan Cox on Tue, 29 August 2006 10:15
		Re: Re: BC: resource beancounters (v2) By: Rohit Seth on Tue, 29 August 2006 17:30
		Re: Re: BC: resource beancounters (v2) By: Alan Cox on Tue, 29 August 2006 18:46
		Re: Re: BC: resource beancounters (v2) By: Rohit Seth on Tue, 29 August 2006 19:15
		Re: [PATCH] BC: resource beancounters (v2) By: dev on Tue, 29 August 2006 15:33
		Re: [PATCH] BC: resource beancounters (v2) By: Balbir Singh on Tue, 29 August 2006 17:08
		Re: [PATCH] BC: resource beancounters (v2) By: Cedric Le Goater on Wed, 23 August 2006 21:00
		Re: [PATCH] BC: resource beancounters (v2) By: Jan Engelhardt on Thu, 24 August 2006 05:52
		Re: [PATCH] BC: resource beancounters (v2) By: Alan Cox on Thu, 24 August 2006 10:38
		Re: [PATCH] BC: resource beancounters (v2) By: Alan Cox on Fri, 25 August 2006 15:36
		Re: [PATCH] BC: resource beancounters (v2) By: Nick Piggin on Sat, 26 August 2006 03:55

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