linux-kernel - Re: [PATCH 06/10] sl[au]b: Allocate objects from memcg cache

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Date:	Mon, 30 Jul 2012 17:11:06 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Greg Thelen <gthelen@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>, <devel@...nvz.org>,
	<cgroups@...r.kernel.org>, Pekka Enberg <penberg@...helsinki.fi>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH 06/10] sl[au]b: Allocate objects from memcg cache

On 07/30/2012 04:58 PM, Kirill A. Shutemov wrote:
> On Wed, Jul 25, 2012 at 06:38:17PM +0400, Glauber Costa wrote:
>> We are able to match a cache allocation to a particular memcg.  If the
>> task doesn't change groups during the allocation itself - a rare event,
>> this will give us a good picture about who is the first group to touch a
>> cache page.
>>
>> This patch uses the now available infrastructure by calling
>> memcg_kmem_get_cache() before all the cache allocations.
>>
>> Signed-off-by: Glauber Costa <glommer@...allels.com>
>> CC: Christoph Lameter <cl@...ux.com>
>> CC: Pekka Enberg <penberg@...helsinki.fi>
>> CC: Michal Hocko <mhocko@...e.cz>
>> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>> CC: Johannes Weiner <hannes@...xchg.org>
>> CC: Suleiman Souhlal <suleiman@...gle.com>
>> ---
>>  include/linux/slub_def.h |   18 +++++++++++++-----
>>  mm/memcontrol.c          |    2 ++
>>  mm/slab.c                |    4 ++++
>>  mm/slub.c                |    1 +
>>  4 files changed, 20 insertions(+), 5 deletions(-)
>>
>> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
>> index 8bb8ad2..148000a 100644
>> --- a/include/linux/slub_def.h
>> +++ b/include/linux/slub_def.h
>> @@ -13,6 +13,8 @@
>>  #include <linux/kobject.h>
>>  
>>  #include <linux/kmemleak.h>
>> +#include <linux/memcontrol.h>
>> +#include <linux/mm.h>
>>  
>>  enum stat_item {
>>  	ALLOC_FASTPATH,		/* Allocation from cpu slab */
>> @@ -209,14 +211,14 @@ static __always_inline int kmalloc_index(size_t size)
>>   * This ought to end up with a global pointer to the right cache
>>   * in kmalloc_caches.
>>   */
>> -static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
>> +static __always_inline struct kmem_cache *kmalloc_slab(gfp_t flags, size_t size)
>>  {
>>  	int index = kmalloc_index(size);
>>  
>>  	if (index == 0)
>>  		return NULL;
>>  
>> -	return kmalloc_caches[index];
>> +	return memcg_kmem_get_cache(kmalloc_caches[index], flags);
>>  }
>>  
>>  void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
>> @@ -225,7 +227,13 @@ void *__kmalloc(size_t size, gfp_t flags);
>>  static __always_inline void *
>>  kmalloc_order(size_t size, gfp_t flags, unsigned int order)
>>  {
>> -	void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
>> +	void *ret;
>> +
>> +	flags = __GFP_COMP;
>> +#ifdef CONFIG_MEMCG_KMEM
>> +	flags |= __GFP_KMEMCG;
>> +#endif
> 
> Em.. I don't see where __GFP_KMEMCG is defined.
> It should be 0 for !CONFIG_MEMCG_KMEM.
> 
It is not, sorry.

As I said, this is dependent on another patch series.
My main goal while sending this was to get the slab part - that will
eventually come ontop of that - discussed. Because they are both quite
complex, I believe they benefit from being discussed separately.

You can find the latest version of that here:

https://lkml.org/lkml/2012/6/25/251
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