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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120726100111.GA7447@shutemov.name>
Date:	Thu, 26 Jul 2012 13:01:11 +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 Thu, Jul 26, 2012 at 01:42:05PM +0400, Glauber Costa wrote:
> On 07/25/2012 10:10 PM, Kirill A. Shutemov wrote:
> > 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.
> > 
> ida_simple_get will not, and should never be called for !CONFIG_MEMCG_KMEM.

Okay. Is there an user for MAX_KMEM_CACHE_TYPES if !CONFIG_MEMCG_KMEM?

-- 
 Kirill A. Shutemov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/