[Devel] [PATCH 7/7] packet: Pre-account maximum socket buffer into cg memory (v2)

[Pavel Emelyanov]

On 06/04/2015 12:02 PM, Vladimir Davydov wrote:
> On Wed, Jun 03, 2015 at 04:35:35PM +0300, Pavel Emelyanov wrote:
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 4d0a756..45bc78d 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -534,6 +534,20 @@ void sock_update_memcg(struct sock *sk)
>>  }
>>  EXPORT_SYMBOL(sock_update_memcg);
>>  
>> +struct mem_cgroup *try_get_mem_cgroup_from_current(void)
>> +{
>> +	struct mem_cgroup *cg;
>> +
>> +	rcu_read_lock();
>> +	cg = mem_cgroup_from_task(current);
>> +	if (mem_cgroup_is_root(cg) || !css_tryget(&cg->css))
>> +		cg = NULL;
>> +	rcu_read_unlock();
>> +
>> +	return cg;
>> +}
>> +EXPORT_SYMBOL(try_get_mem_cgroup_from_current);
>> +
> 
> Why not use try_get_mem_cgroup_from_mm(current->mm) instead?

Because it's stupid, I don't need the steps it does when trying 
to pick the mm owner in a loop.

-- Pavel