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Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) [message #5372 is a reply to message #5313]

Fri, 18 August 2006 09:29

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

Dave Hansen wrote:
> On Thu, 2006-08-17 at 17:27 +0400, Kirill Korotaev wrote:
>
>>charged kernel objects can't be _reclaimed_. how do you propose
>>to reclaim tasks page tables or files or task struct or vma or etc.?
>
>
> Do you have any statistics on which of these objects are the most
> troublesome? If it _is_ pagetables, for instance, it is quite
> conceivable that we could reclaim them.
they all are troublesome :/
user can create lots of vmas, w/o page tables.
lots of fdsets, ipcids.
These are not reclaimable.

Also consider the following scenario with reclaimable page tables.
e.g. user hit kmemsize limit due to fat page tables.
kernel reclaims some of the page tables and frees user kenerl memory.
after that user creates some uncreclaimable objects like fdsets or ipcs
and then accesses memory with reclaimed page tables.
Sooner or later we kill user with SIGSEGV from page fault due to
no memory. This is worse then returning ENOMEM from poll() or
mmap() where user allocates kernel objects.

> This one probably deserves a big, fat comment, though. ;)
tell me where to write it and what? :)

Thanks,
Kirill

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[Message index]

		[RFC][PATCH] UBC: user resource beancounters By: dev on Wed, 16 August 2006 15:23
		[RFC][PATCH 1/7] UBC: kconfig By: dev on Wed, 16 August 2006 15:34
		Re: [ckrm-tech] [RFC][PATCH 1/7] UBC: kconfig By: Chandra Seetharaman on Fri, 18 August 2006 19:57
		Re: [RFC][PATCH 1/7] UBC: kconfig By: Adrian Bunk on Fri, 18 August 2006 21:14
		Re: [RFC][PATCH 1/7] UBC: kconfig By: Pavel Machek on Fri, 25 August 2006 15:12
		[RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Wed, 16 August 2006 15:35
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Alan Cox on Wed, 16 August 2006 16:38
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Thu, 17 August 2006 11:40
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Andrew Morton on Wed, 16 August 2006 18:18
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Thu, 17 August 2006 11:52
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Greg KH on Wed, 16 August 2006 17:15
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Thu, 17 August 2006 11:43
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Greg KH on Thu, 17 August 2006 12:14
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Dave Hansen on Thu, 17 August 2006 14:32
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Fri, 18 August 2006 12:34
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Rohit Seth on Wed, 16 August 2006 18:11
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Thu, 17 August 2006 11:52
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Rohit Seth on Thu, 17 August 2006 16:55
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Fri, 18 August 2006 11:13
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Rohit Seth on Fri, 18 August 2006 17:51
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Andrew Morton on Fri, 18 August 2006 05:31
		Re: [PATCH 2/7] UBC: core (structures, API) By: Andrey Savochkin on Fri, 18 August 2006 07:35
		Re: [ckrm-tech] [PATCH 2/7] UBC: core (structures, API) By: Matt Helsley on Fri, 18 August 2006 08:26
		Re: [ckrm-tech] [PATCH 2/7] UBC: core (structures, API) By: dev on Fri, 18 August 2006 11:50
		Re: [RFC][PATCH 2/7] UBC: core (structures, API) By: Alan Cox on Fri, 18 August 2006 15:39
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Srivatsa Vaddagiri on Thu, 17 August 2006 11:09
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: dev on Thu, 17 August 2006 14:00
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Chandra Seetharaman on Thu, 17 August 2006 18:59
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Matt Helsley on Fri, 18 August 2006 01:58
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Balbir Singh on Sun, 20 August 2006 05:01
		Re: [ckrm-tech] [RFC][PATCH 2/7] UBC: core (structures, API) By: Balbir Singh on Sun, 20 August 2006 04:58
		[RFC][PATCH 3/7] UBC: ub context and inheritance By: dev on Wed, 16 August 2006 15:36
		Re: [RFC][PATCH 3/7] UBC: ub context and inheritance By: Alan Cox on Wed, 16 August 2006 16:31
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: Srivatsa Vaddagiri on Thu, 17 August 2006 11:09
		Re: Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: xemul on Thu, 17 August 2006 13:21
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: Matt Helsley on Fri, 18 August 2006 02:42
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: dev on Fri, 18 August 2006 09:21
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: Matt Helsley on Sat, 19 August 2006 02:19
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: Chandra Seetharaman on Fri, 18 August 2006 20:03
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: dev on Mon, 21 August 2006 10:30
		Re: [ckrm-tech] [RFC][PATCH 3/7] UBC: ub context and inheritance By: Chandra Seetharaman on Mon, 21 August 2006 20:48
		[RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Wed, 16 August 2006 15:37
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Alan Cox on Wed, 16 August 2006 16:32
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Alan Cox on Wed, 16 August 2006 18:44
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Wed, 16 August 2006 19:22
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Thu, 17 August 2006 12:11
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Andrew Morton on Thu, 17 August 2006 15:40
		Re: [PATCH 4/7] UBC: syscalls (user interface) By: Andrey Savochkin on Fri, 18 August 2006 08:08
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Dave Hansen on Fri, 18 August 2006 14:45
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Magnus Damm on Mon, 21 August 2006 02:47
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Tue, 22 August 2006 01:16
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Magnus Damm on Tue, 22 August 2006 03:58
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Chandra Seetharaman on Tue, 22 August 2006 18:34
		Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Thu, 24 August 2006 01:20
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Fri, 18 August 2006 11:03
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Thu, 17 August 2006 17:08
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Greg KH on Wed, 16 August 2006 17:17
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Thu, 17 August 2006 12:00
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Wed, 16 August 2006 18:17
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Thu, 17 August 2006 12:03
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Rohit Seth on Thu, 17 August 2006 17:05
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Srivatsa Vaddagiri on Thu, 17 August 2006 11:09
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Thu, 17 August 2006 14:03
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Srivatsa Vaddagiri on Thu, 17 August 2006 16:19
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Matt Helsley on Fri, 18 August 2006 02:31
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: dev on Fri, 18 August 2006 11:43
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Matt Helsley on Sat, 19 August 2006 02:43
		Re: [ckrm-tech] [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Chandra Seetharaman on Fri, 18 August 2006 20:13
		Re: [RFC][PATCH 4/7] UBC: syscalls (user interface) By: Arnd Bergmann on Fri, 18 August 2006 11:40
		[RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Wed, 16 August 2006 15:39
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Alan Cox on Wed, 16 August 2006 16:35
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Thu, 17 August 2006 13:45
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Wed, 16 August 2006 18:47
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Wed, 16 August 2006 19:15
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Alan Cox on Thu, 17 August 2006 00:02
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Thu, 17 August 2006 16:36
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Fri, 18 August 2006 08:43
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Thu, 17 August 2006 13:33
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Thu, 17 August 2006 17:13
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Fri, 18 August 2006 08:47
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Thu, 17 August 2006 13:29
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Thu, 17 August 2006 14:36
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Fri, 18 August 2006 08:12
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Fri, 18 August 2006 14:43
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Mon, 21 August 2006 08:56
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Wed, 16 August 2006 18:24
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Thu, 17 August 2006 13:25
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Thu, 17 August 2006 14:38
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Fri, 18 August 2006 09:29
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Fri, 18 August 2006 14:58
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Mon, 21 August 2006 10:38
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Mon, 21 August 2006 15:10
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Dave Hansen on Fri, 18 August 2006 15:06
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Mon, 21 August 2006 12:36
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Thu, 17 August 2006 17:02
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Fri, 18 August 2006 09:36
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Fri, 18 August 2006 16:55
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Mon, 21 August 2006 10:41
		Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Rohit Seth on Tue, 22 August 2006 01:23
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Chandra Seetharaman on Fri, 18 August 2006 20:26
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: dev on Mon, 21 August 2006 10:48
		Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) By: Chandra Seetharaman on Mon, 21 August 2006 20:55
		[RFC][PATCH 6/7] UBC: kernel memory acconting (mark objects) By: dev on Wed, 16 August 2006 15:40
		Re: [RFC][PATCH 6/7] UBC: kernel memory acconting (mark objects) By: Alan Cox on Wed, 16 August 2006 16:36
		[RFC][PATCH 7/7] UBC: proc interface By: dev on Wed, 16 August 2006 15:42
		Re: [RFC][PATCH 7/7] UBC: proc interface By: Greg KH on Wed, 16 August 2006 17:13
		Re: [RFC][PATCH 7/7] UBC: proc interface By: dev on Thu, 17 August 2006 13:41
		Re: [RFC][PATCH 7/7] UBC: proc interface By: Greg KH on Thu, 17 August 2006 15:40
		Re: Re: [RFC][PATCH 7/7] UBC: proc interface By: kir on Thu, 17 August 2006 16:12
		Re: [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Wed, 16 August 2006 19:06
		Re: [RFC][PATCH] UBC: user resource beancounters By: Rohit Seth on Wed, 16 August 2006 18:53
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Thu, 17 August 2006 00:15
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Srivatsa Vaddagiri on Thu, 17 August 2006 11:02
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: dev on Thu, 17 August 2006 13:53
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Thu, 17 August 2006 19:55
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 18 August 2006 19:39
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: dev on Mon, 21 August 2006 13:21
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Mon, 21 August 2006 21:45
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Mon, 21 August 2006 22:01
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Mon, 21 August 2006 22:44
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Rohit Seth on Tue, 22 August 2006 01:45
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Tue, 22 August 2006 09:42
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Arjan van de Ven on Tue, 22 August 2006 09:57
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Tue, 22 August 2006 10:54
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Rohit Seth on Thu, 24 August 2006 01:31
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Tue, 22 August 2006 18:55
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Rohit Seth on Thu, 24 August 2006 01:44
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Thu, 24 August 2006 02:04
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Thu, 24 August 2006 10:49
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Thu, 24 August 2006 23:48
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Kyle Moffett on Thu, 24 August 2006 23:55
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 18:21
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Fri, 25 August 2006 20:25
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 21:37
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Fri, 25 August 2006 22:30
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 22:59
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Rohit Seth on Thu, 24 August 2006 17:27
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Thu, 24 August 2006 23:52
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: dev on Fri, 25 August 2006 11:10
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 18:47
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Fri, 25 August 2006 20:32
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 22:23
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Alan Cox on Fri, 25 August 2006 22:51
		Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters By: Chandra Seetharaman on Fri, 25 August 2006 23:00

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