linux-kernel - Re: [PATCH v2 03/13] memcg: Uncharge all kmem when deleting a cgroup.

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Message-ID: <4F608820.8080006@parallels.com>
Date:	Wed, 14 Mar 2012 15:59:28 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Suleiman Souhlal <suleiman@...gle.com>
CC:	Suleiman Souhlal <ssouhlal@...ebsd.org>, <cgroups@...r.kernel.org>,
	<kamezawa.hiroyu@...fujitsu.com>, <penberg@...nel.org>,
	<cl@...ux.com>, <yinghan@...gle.com>, <hughd@...gle.com>,
	<gthelen@...gle.com>, <peterz@...radead.org>,
	<dan.magenheimer@...cle.com>, <hannes@...xchg.org>,
	<mgorman@...e.de>, <James.Bottomley@...senpartnership.com>,
	<linux-mm@...ck.org>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/13] memcg: Uncharge all kmem when deleting a cgroup.


>>> @@ -3719,6 +3721,8 @@ move_account:
>>>                 /* This is for making all *used* pages to be on LRU. */
>>>                 lru_add_drain_all();
>>>                 drain_all_stock_sync(memcg);
>>> +               if (!free_all)
>>> +                       memcg_kmem_move(memcg);
>>
>> Any reason we're not moving kmem charges when free_all is set as well?
>
> Because the slab moving code expects to be synchronized with
> allocations (and itself). We can't call it when there are still tasks
> in the cgroup.

Ok.

Please add an explanation about that.
Oh boy, reading it all now, I started to believe that "free_all" is a 
really poor name =(


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