linux-kernel - Re: [PATCH v2 09/11] memcg: propagate kmem limiting information to children

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Message-ID: <5028B450.9080309@parallels.com>
Date:	Mon, 13 Aug 2012 12:01:20 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v2 09/11] memcg: propagate kmem limiting information to
 children

On 08/10/2012 09:51 PM, Kamezawa Hiroyuki wrote:
>> +		/*
>> +		 * Once enabled, can't be disabled. We could in theory disable
>> +		 * it if we haven't yet created any caches, or if we can shrink
>> +		 * them all to death. But it is not worth the trouble
>> +		 */
>>   		static_key_slow_inc(&memcg_kmem_enabled_key);
>> -		memcg->kmem_accounted = true;
>> +
>> +		if (!memcg->use_hierarchy)
>> +			goto out;
>> +
>> +		for_each_mem_cgroup_tree(iter, memcg) {
>> +			if (iter == memcg)
>> +				continue;
>> +			memcg_kmem_account_parent(iter);
>> +		}
> 
> Could you add an explanation comment ?
> 

Of course, Kame.
Thanks

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