linux-kernel - Re: [PATCH v2 02/13] memcg: Kernel memory accounting infrastructure.

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Message-ID: <4F61CD63.4090007@parallels.com>
Date:	Thu, 15 Mar 2012 15:07:15 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Suleiman Souhlal <ssouhlal@...eBSD.org>, <cgroups@...r.kernel.org>,
	<suleiman@...gle.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 02/13] memcg: Kernel memory accounting infrastructure.

On 03/15/2012 04:48 AM, KAMEZAWA Hiroyuki wrote:
>>>    - What happens when a new cgroup created ?
>> >
>> >  mem_cgroup_create() is called =)
>> >  Heh, jokes apart, I don't really follow here. What exactly do you mean?
>> >  There shouldn't be anything extremely out of the ordinary.
>> >
>
> Sorry, too short words.
>
> Assume a cgroup with
> 	cgroup.memory.limit_in_bytes=1G
> 	cgroup.memory.kmem.limit_in_bytes=400M
>
> When a child cgroup is created, what should be the default values.
> 'unlimited' as current implementation ?
> Hmm..maybe yes.

I think so, yes. I see no reason to come up with any default values
in memcg. Yes, your allocations can fail due to your parent limits.
But since I never heard of any machine with
9223372036854775807 bytes of memory, that is true even for the root memcg =)

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