linux-kernel - Re: [PATCH] memcg: fix memcg_cache_name() to use cgroup

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Message-ID: <514C14BF.3050009@parallels.com>
Date:	Fri, 22 Mar 2013 12:22:23 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Li Zefan <lizefan@...wei.com>
CC:	Michal Hocko <mhocko@...e.cz>, Tejun Heo <tj@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] memcg: fix memcg_cache_name() to use cgroup_name()

On 03/22/2013 12:17 PM, Li Zefan wrote:
>> GFP_TEMPORARY groups short lived allocations but the mem cache is not
>> > an ideal candidate of this type of allocations..
>> > 
> I'm not sure I'm following you...
> 
> char *memcg_cache_name()
> {
> 	char *name = alloc();
> 	return name;
> }
> 
> kmem_cache_dup()
> {
> 	name = memcg_cache_name();
> 	kmem_cache_create_memcg(name);
> 	free(name);
> }
> 
> Isn't this a short lived allocation?
> 

Hi,

Thanks for identifying and fixing this.

Li is right. The cache name will live long, but this is because the
slab/slub caches will strdup it internally. So the actual memcg
allocation is short lived.

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