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Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs [message #46978 is a reply to message #46974]

Tue, 26 June 2012 09:05

David Rientjes
Messages: 59
Registered: November 2006

Member

On Tue, 26 Jun 2012, Glauber Costa wrote:

> > Right, because I'm sure that __GFP_KMEMCG will be used in additional
> > places outside of this patchset and it will be a shame if we have to
> > always add #ifdef's. I see no reason why we would care if __GFP_KMEMCG
> > was used when CONFIG_CGROUP_MEM_RES_CTLR_KMEM=n with the semantics that it
> > as in this patchset. It's much cleaner by making it 0x0 when disabled.
> >
>
> What I can do, instead, is to WARN_ON conditionally to the config option in
> the page allocator, and make sure no one is actually passing the flag in that
> case.
>

I don't think adding a conditional to the page allocator's fastpath when
CONFIG_CGROUP_MEM_RES_CTLR_KMEM=n is appropriate. I don't understand why
this can't be 0x0 for such a configuration, __GFP_KMEM certainly means
nothing when we don't have it enabled so how is this different at all from
kmemcheck?

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[Message index]

		[PATCH 00/11] kmem controller for memcg: stripped down version By: Glauber Costa on Mon, 25 June 2012 14:15
		[PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Suleiman Souhlal on Mon, 25 June 2012 23:33
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Tue, 26 June 2012 08:39
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Suleiman Souhlal on Wed, 27 June 2012 16:16
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: David Rientjes on Tue, 26 June 2012 04:09
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Tue, 26 June 2012 07:12
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: David Rientjes on Tue, 26 June 2012 08:54
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Tue, 26 June 2012 09:08
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: David Rientjes on Tue, 26 June 2012 09:17
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Tue, 26 June 2012 09:23
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Wed, 27 June 2012 10:03
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: David Rientjes on Wed, 27 June 2012 19:48
		Re: [PATCH 02/11] memcg: Reclaim when more than one page needed. By: Glauber Costa on Wed, 27 June 2012 20:47
		[PATCH 03/11] memcg: change defines to an enum By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 03/11] memcg: change defines to an enum By: David Rientjes on Tue, 26 June 2012 04:11
		Re: [PATCH 03/11] memcg: change defines to an enum By: Glauber Costa on Tue, 26 June 2012 08:28
		Re: [PATCH 03/11] memcg: change defines to an enum By: David Rientjes on Tue, 26 June 2012 09:01
		[PATCH 01/11] memcg: Make it possible to use the stock for more than one page. By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 01/11] memcg: Make it possible to use the stock for more than one page. By: Tejun Heo on Mon, 25 June 2012 17:44
		Re: [PATCH 01/11] memcg: Make it possible to use the stock for more than one page. By: Glauber Costa on Mon, 25 June 2012 22:29
		Re: [PATCH 01/11] memcg: Make it possible to use the stock for more than one page. By: Tejun Heo on Mon, 25 June 2012 22:33
		Re: [PATCH 01/11] memcg: Make it possible to use the stock for more than one page. By: David Rientjes on Tue, 26 June 2012 04:01
		[PATCH 05/11] Add a __GFP_KMEMCG flag By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 05/11] Add a __GFP_KMEMCG flag By: David Rientjes on Tue, 26 June 2012 04:25
		Re: [PATCH 05/11] Add a __GFP_KMEMCG flag By: Glauber Costa on Tue, 26 June 2012 07:08
		Re: [PATCH 05/11] Add a __GFP_KMEMCG flag By: David Rientjes on Tue, 26 June 2012 09:03
		[PATCH 04/11] kmem slab accounting basic infrastructure By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 04/11] kmem slab accounting basic infrastructure By: David Rientjes on Tue, 26 June 2012 04:22
		Re: [PATCH 04/11] kmem slab accounting basic infrastructure By: Glauber Costa on Tue, 26 June 2012 07:09
		[PATCH 10/11] memcg: allow a memcg with kmem charges to be destructed. By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 10/11] memcg: allow a memcg with kmem charges to be destructed. By: Tejun Heo on Mon, 25 June 2012 18:34
		Re: [PATCH 10/11] memcg: allow a memcg with kmem charges to be destructed. By: Glauber Costa on Mon, 25 June 2012 22:25
		Re: [PATCH 10/11] memcg: allow a memcg with kmem charges to be destructed. By: KAMEZAWA Hiroyuki on Tue, 26 June 2012 05:59
		Re: [PATCH 10/11] memcg: allow a memcg with kmem charges to be destructed. By: Glauber Costa on Tue, 26 June 2012 07:21
		[PATCH 07/11] mm: Allocate kernel pages to the right memcg By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 07/11] mm: Allocate kernel pages to the right memcg By: Tejun Heo on Mon, 25 June 2012 18:07
		Re: [PATCH 07/11] mm: Allocate kernel pages to the right memcg By: Glauber Costa on Mon, 25 June 2012 22:27
		[PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Tejun Heo on Mon, 25 June 2012 18:38
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Frederic Weisbecker on Mon, 25 June 2012 20:57
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Glauber Costa on Tue, 26 June 2012 12:48
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Frederic Weisbecker on Tue, 26 June 2012 13:38
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Glauber Costa on Tue, 26 June 2012 13:37
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Frederic Weisbecker on Tue, 26 June 2012 13:44
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: David Rientjes on Tue, 26 June 2012 04:57
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: KAMEZAWA Hiroyuki on Tue, 26 June 2012 05:35
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Glauber Costa on Tue, 26 June 2012 07:23
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: David Rientjes on Tue, 26 June 2012 08:45
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Glauber Costa on Tue, 26 June 2012 08:44
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: David Rientjes on Tue, 26 June 2012 09:05
		Re: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs By: Frederic Weisbecker on Mon, 25 June 2012 16:55
		[PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Tejun Heo on Mon, 25 June 2012 18:06
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Mon, 25 June 2012 22:28
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: akpm on Mon, 25 June 2012 23:17
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Tue, 26 June 2012 14:40
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Tue, 26 June 2012 15:01
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: akpm on Tue, 26 June 2012 18:01
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Tejun Heo on Tue, 26 June 2012 18:08
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Tue, 26 June 2012 18:14
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: akpm on Tue, 26 June 2012 19:20
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Tue, 26 June 2012 15:29
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: David Rientjes on Tue, 26 June 2012 09:12
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Tue, 26 June 2012 09:17
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: David Rientjes on Wed, 27 June 2012 04:01
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: Glauber Costa on Wed, 27 June 2012 09:33
		Re: [PATCH 06/11] memcg: kmem controller infrastructure By: David Rientjes on Wed, 27 June 2012 19:46
		[PATCH 09/11] memcg: propagate kmem limiting information to children By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: Tejun Heo on Mon, 25 June 2012 18:29
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: Glauber Costa on Mon, 25 June 2012 22:36
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: Tejun Heo on Mon, 25 June 2012 22:49
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: akpm on Mon, 25 June 2012 23:21
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: David Rientjes on Tue, 26 June 2012 05:23
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: akpm on Mon, 25 June 2012 23:23
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: David Rientjes on Tue, 26 June 2012 05:24
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: akpm on Tue, 26 June 2012 05:31
		Re: [PATCH 09/11] memcg: propagate kmem limiting information to children By: Glauber Costa on Tue, 26 June 2012 07:23
		[PATCH 08/11] memcg: disable kmem code when not in use. By: Glauber Costa on Mon, 25 June 2012 14:15
		Re: [PATCH 08/11] memcg: disable kmem code when not in use. By: KAMEZAWA Hiroyuki on Tue, 26 June 2012 05:51
		Re: [PATCH 00/11] kmem controller for memcg: stripped down version By: akpm on Mon, 25 June 2012 23:27
		Re: [PATCH 00/11] kmem controller for memcg: stripped down version By: Glauber Costa on Tue, 26 June 2012 07:17
		Re: [PATCH 00/11] kmem controller for memcg: stripped down version By: akpm on Tue, 26 June 2012 21:55
		Re: [PATCH 00/11] kmem controller for memcg: stripped down version By: David Rientjes on Wed, 27 June 2012 01:08
		Re: [PATCH 00/11] kmem controller for memcg: stripped down version By: Glauber Costa on Wed, 27 June 2012 08:39
		Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down versio By: Glauber Costa on Wed, 27 June 2012 09:29
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Frederic Weisbecker on Wed, 27 June 2012 12:29
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Glauber Costa on Wed, 27 June 2012 12:28
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Frederic Weisbecker on Wed, 27 June 2012 12:35
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: David Rientjes on Wed, 27 June 2012 19:38
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Glauber Costa on Thu, 28 June 2012 09:01
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: akpm on Thu, 28 June 2012 22:25
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Glauber Costa on Tue, 03 July 2012 11:38
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Frederic Weisbecker on Thu, 12 July 2012 15:40
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Glauber Costa on Tue, 07 August 2012 13:59
		Re: Fork bomb limitation in memcg WAS: Re: [PATCH 00/11] kmem controller for memcg: stripped down ve By: Glauber Costa on Wed, 08 August 2012 14:15

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