Re: [PATCH] memcg: fix memcg_cache_name() to use cgroup_name()

[Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>]

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.