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Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree [message #46343 is a reply to message #46342]

Fri, 11 May 2012 19:11

Glauber Costa
Messages: 916
Registered: October 2011

Senior Member

On 05/11/2012 04:09 PM, Christoph Lameter wrote:
> On Fri, 11 May 2012, Glauber Costa wrote:
>
>> On 05/11/2012 03:56 PM, Christoph Lameter wrote:
>>> On Fri, 11 May 2012, Glauber Costa wrote:
>>>
>>>> So we don't mix pages from multiple memcgs in the same cache - we believe
>>>> that
>>>> would be too confusing.
>>>
>>> Well subsystem create caches and other things that are shared between
>>> multiple processes. How can you track that?
>>
>> Each process that belongs to a memcg triggers the creation of a new child kmem
>> cache.
>
> I see that. But there are other subsystems from slab allocators that do
> the same. There are also objects that may be used by multiple processes.

This is also true for normal user pages. And then, we do what memcg
does: first one to touch, gets accounted. I don't think deviating from
the memcg behavior for user pages makes much sense here.

A cache won't go away while it still have objects, even after the memcg
is removed (it is marked as dead)

> F.e what about shm?
>
>>>> /proc/slabinfo reflects this information, by listing the memcg-specific
>>>> slabs.
>>>
>>> What about /sys/kernel/slab/*?
>>
>> From the PoV of the global system, what you'll see is something like:
>> dentry , dentry(2:memcg1), dentry(2:memcg2), etc.
>
> Hmmm.. Would be better to have a hierachy there. /proc/slabinfo is more
> legacy.

I can take a look at that then. Assuming you agree with all the rest, is
looking into that a pre-requisite for merging, or is something that can
be deferred for a phase2 ? (We still don't do shrinkers, for instance,
so this is sure to have a phase2)

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[Message index]

		[PATCH v2 00/29] kmem limitation for memcg By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 03/29] memcg: Always free struct memcg through schedule_work() By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 07/29] memcg: Reclaim when more than one page needed. By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 09/29] memcg: change defines to an enum By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 01/29] slab: dup name string By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 01/29] slab: dup name string By: David Rientjes on Tue, 15 May 2012 22:04
		Re: [PATCH v2 01/29] slab: dup name string By: Glauber Costa on Wed, 16 May 2012 06:12
		[PATCH v2 10/29] res_counter: don't force return value checking in res_counter_charge_nofail By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 02/29] slub: fix slab_state for slub By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 02/29] slub: fix slab_state for slub By: Christoph Lameter on Fri, 11 May 2012 17:51
		Re: [PATCH v2 02/29] slub: fix slab_state for slub By: David Rientjes on Tue, 15 May 2012 21:55
		Re: [PATCH v2 02/29] slub: fix slab_state for slub By: Glauber Costa on Wed, 16 May 2012 06:10
		Re: [PATCH v2 02/29] slub: fix slab_state for slub By: Glauber Costa on Thu, 17 May 2012 10:14
		[PATCH v2 06/29] memcg: Make it possible to use the stock for more than one page. By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 17:53
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 17:57
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 18:06
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 18:11
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 18:17
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 18:20
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 18:32
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 18:42
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 18:56
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 18:58
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 19:09
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 19:11
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Christoph Lameter on Fri, 11 May 2012 19:20
		Re: [PATCH v2 04/29] slub: always get the cache from its page in kfree By: Glauber Costa on Fri, 11 May 2012 19:24
		[PATCH v2 12/29] kmem slab accounting basic infrastructure By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 05/29] slab: rename gfpflags to allocflags By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 05/29] slab: rename gfpflags to allocflags By: Christoph Lameter on Fri, 11 May 2012 17:54
		Re: [PATCH v2 05/29] slab: rename gfpflags to allocflags By: David Rientjes on Tue, 15 May 2012 21:57
		[PATCH v2 11/29] cgroups: ability to stop res charge propagation on bounded ancestor By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 11/29] cgroups: ability to stop res charge propagation on bounded ancestor By: KAMEZAWA Hiroyuki on Tue, 15 May 2012 02:59
		Re: [PATCH v2 11/29] cgroups: ability to stop res charge propagation on bounded ancestor By: Glauber Costa on Wed, 16 May 2012 06:16
		[PATCH v2 08/29] slab: use obj_size field of struct kmem_cache when not debugging By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 13/29] slab/slub: struct memcg_params By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 14/29] slub: consider a memcg parameter in kmem_create_cache By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 15/29] slab: pass memcg parameter to kmem_cache_create By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 16/29] slub: create duplicate cache By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 25/29] memcg: Track all the memcg children of a kmem_cache. By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 17/29] slab: create duplicate cache By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 26/29] memcg: Per-memcg memory.kmem.slabinfo file. By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: KAMEZAWA Hiroyuki on Tue, 15 May 2012 02:57
		Re: [PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: Glauber Costa on Wed, 16 May 2012 06:42
		Re: [PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: KAMEZAWA Hiroyuki on Wed, 16 May 2012 08:18
		Re: [PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: Glauber Costa on Wed, 16 May 2012 08:25
		Re: [PATCH v2 18/29] memcg: kmem controller charge/uncharge infrastructure By: KAMEZAWA Hiroyuki on Wed, 16 May 2012 09:15
		[PATCH v2 19/29] skip memcg kmem allocations in specified code regions By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 19/29] skip memcg kmem allocations in specified code regions By: KAMEZAWA Hiroyuki on Tue, 15 May 2012 02:46
		Re: [PATCH v2 19/29] skip memcg kmem allocations in specified code regions By: Glauber Costa on Wed, 16 May 2012 06:19
		Re: [PATCH v2 19/29] skip memcg kmem allocations in specified code regions By: KAMEZAWA Hiroyuki on Wed, 16 May 2012 07:55
		[PATCH v2 20/29] slub: charge allocation to a memcg By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 21/29] slab: per-memcg accounting of slab caches By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 22/29] memcg: disable kmem code when not in use. By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 23/29] memcg: destroy memcg caches By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 24/29] memcg/slub: shrink dead caches By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 27/29] slub: create slabinfo file for memcg By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 28/29] slub: track all children of a kmem cache By: Glauber Costa on Fri, 11 May 2012 17:44
		[PATCH v2 29/29] Documentation: add documentation for slab tracker for memcg By: Glauber Costa on Fri, 11 May 2012 17:44
		Re: [PATCH v2 00/29] kmem limitation for memcg By: Glauber Costa on Fri, 11 May 2012 18:05

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