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Re: [PATCH] BC: resource beancounters (v2) [message #5678 is a reply to message #5657]

Sat, 26 August 2006 03:55

Nick Piggin
Messages: 35
Registered: March 2006

Member

Alan Cox wrote:
> Ar Sad, 2006-08-26 am 01:14 +1000, ysgrifennodd Nick Piggin:
>
>>I still think doing simple accounting per-page would be a better way to
>>go than trying to pin down all "user allocatable" kernel allocations.
>>And would require all of about 2 hooks in the page allocator. And would
>>track *actual* RAM allocated by that container.
>
>
> You have a variety of kernel objects you want to worry about and they
> have very differing properties.
>
> Some are basically shared resources - page cache, dentries, inodes, etc
> and can be balanced pretty well by the kernel (ok the dentries are a bit
> of a problem right now). Others are very specific "owned" resources -
> like file handles, sockets and vmas.

That's true (OTOH I'd argue it would still be very useful for things
like pagecache, so one container can't start a couple of 'dd' loops
and turn everyone else to crap). And while the sharing may not be
exactly captured, statistically things should balance over time.

So I'm not arguing about _also_ accounting resources that are limited
in other ways (than just the RAM they consume).

But as a DoS protection measure on RAM usage, trying to account all
kernel allocations that are user triggerable just sounds hard to
maintain, holey, ugly, invsive (and not perfect either -- in fact it
still isn't clear to me that it is any better than my proposal).

>
> Tracking actual RAM use by container/user/.. isn't actually that
> interesting. It's also inconveniently sub page granularity.

If it isn't interesting, then I don't think we want it (at least, until
someone does get an interest in it).

>
> Its a whole seperate question whether you want a separate bean counter
> limit for sockets, file handles, vmas etc.

Yeah that's fair enough. We obviously want to avoid exposing limits on
things that it doesn't make sense to limit, or that is a kernel
implementation detail as much as possible.

eg. so I would be happy to limit virtual address, less happy to limit
vmas alone (unless that is in the context of accounting their RAM usage
or their implied vaddr charge).

--
SUSE Labs, Novell Inc.
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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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