linux-kernel - Re: [PATCH v5 07/14] mm: Allocate kernel pages to the right memcg

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Message-Id: <20121018134457.5e7edd19.akpm@linux-foundation.org>
Date:	Thu, 18 Oct 2012 13:44:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<linux-mm@...ck.org>, <cgroups@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	<kamezawa.hiroyu@...fujitsu.com>, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v5 07/14] mm: Allocate kernel pages to the right memcg

On Thu, 18 Oct 2012 13:24:47 +0400
Glauber Costa <glommer@...allels.com> wrote:

> On 10/18/2012 02:12 AM, Andrew Morton wrote:
> > On Tue, 16 Oct 2012 14:16:44 +0400
> > Glauber Costa <glommer@...allels.com> wrote:
> > 
> >> When a process tries to allocate a page with the __GFP_KMEMCG flag, the
> >> page allocator will call the corresponding memcg functions to validate
> >> the allocation. Tasks in the root memcg can always proceed.
> >>
> >> To avoid adding markers to the page - and a kmem flag that would
> >> necessarily follow, as much as doing page_cgroup lookups for no reason,
> >> whoever is marking its allocations with __GFP_KMEMCG flag is responsible
> >> for telling the page allocator that this is such an allocation at
> >> free_pages() time.
> > 
> > Well, why?  Was that the correct decision?
> > 
> 
> I don't fully understand your question. Is this the same question you
> posed in patch 0, about marking some versus marking all? If so, I
> believe I should have answered it there.

Yes, it's the same question.  The one which has not yet been fully answered ;)
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