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

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Message-ID: <507FEDC1.4010406@parallels.com>
Date:	Thu, 18 Oct 2012 15:53:37 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 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?
> 
>> This is done by the invocation of
>> __free_accounted_pages() and free_accounted_pages().
> 
> These are very general-sounding names.  I'd expect the identifiers to
> contain "memcg" and/or "kmem", to identify what's going on.
> 
I've just changed to free_memcg_kmem_pages.
Let me know if the name is better.

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