[Devel] Re: [PATCH v4 19/25] memcg: disable kmem code when not in use.

[Glauber Costa]

>>
>>    static void drain_all_stock_async(struct mem_cgroup *memcg);
>> @@ -4344,8 +4358,13 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
>>    			 *
>>    			 * But it is not worth the trouble
>>    			 */
>> -			if (!memcg->kmem_accounted&&  val != RESOURCE_MAX)
>> +			mutex_lock(&set_limit_mutex);
>> +			if (!memcg->kmem_accounted&&  val != RESOURCE_MAX
>> +			&&  !memcg->kmem_accounted) {
> 
> I'm sorry why you check the value twice ?
> 

Hi Kame,

For no reason, it should be removed. I never noticed this because 1)
This is the kind of thing testing will never reveal, and 2), this
actually goes away in a later patch (memcg: propagate kmem limiting
information to children)

In any case, I will update my tree here.

Thanks for spotting this