linux-kernel - Re: [PATCH 02/10] consider a memcg parameter in kmem_create

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Message-ID: <20120725181018.GA4921@shutemov.name>
Date:	Wed, 25 Jul 2012 21:10:18 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Glauber Costa <glommer@...allels.com>
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 02/10] consider a memcg parameter in kmem_create_cache

On Wed, Jul 25, 2012 at 06:38:13PM +0400, Glauber Costa wrote:

...

> @@ -337,6 +341,12 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
>  	__kmalloc(size, flags)
>  #endif /* DEBUG_SLAB */
>  
> +#ifdef CONFIG_MEMCG_KMEM
> +#define MAX_KMEM_CACHE_TYPES 400
> +#else
> +#define MAX_KMEM_CACHE_TYPES 0
> +#endif /* CONFIG_MEMCG_KMEM */
> +
>  #ifdef CONFIG_NUMA
>  /*
>   * kmalloc_node_track_caller is a special version of kmalloc_node that

...

> @@ -527,6 +532,24 @@ static inline bool memcg_kmem_enabled(struct mem_cgroup *memcg)
>  		memcg->kmem_accounted;
>  }
>  
> +struct ida cache_types;
> +
> +void memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *cachep)
> +{
> +	int id = -1;
> +
> +	if (!memcg)
> +		id = ida_simple_get(&cache_types, 0, MAX_KMEM_CACHE_TYPES,
> +				    GFP_KERNEL);

MAX_KMEM_CACHE_TYPES is 0 if CONFIG_MEMCG_KMEM undefined.
If 'end' parameter of ida_simple_get() is 0 it will use default max value
which is 0x80000000.
I guess you want MAX_KMEM_CACHE_TYPES to be 1 for !CONFIG_MEMCG_KMEM.

-- 
 Kirill A. Shutemov
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