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

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Date:	Fri, 17 Aug 2012 14:07:00 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<kamezawa.hiroyu@...fujitsu.com>, 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 08/17/2012 01:35 PM, Michal Hocko wrote:
>>> Above you said "Once enabled, can't be disabled." and now you can
>>> > > disable it? Say you are a leaf group with non accounted parents. This
>>> > > will clear the flag and so no further accounting is done. Shouldn't
>>> > > unlimited mean that we will never reach the limit? Or am I missing
>>> > > something?
>>> > >
>> > 
>> > You are missing something, and maybe I should be more clear about that.
>> > The static branches can't be disabled (it is only safe to disable them
>> > from disarm_static_branches(), when all references are gone). Note that
>> > when unlimited, we flip bits, do a transversal, but there is no mention
>> > to the static branch.
> My little brain still doesn't get this. I wasn't concerned about static
> branches. I was worried about memcg_can_account_kmem which will return
> false now, doesn't it.
> 

Yes, it will. If I got you right, you are concerned because I said that
can't happen. But it will.

But I never said that can't happen. I said (ok, I meant) the static
branches can't be disabled.

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