linux-kernel - Re: [PATCH -V5 07/14] memcg: Add HugeTLB extension

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Message-ID: <87zkalcn26.fsf@skywalker.in.ibm.com>
Date:	Mon, 09 Apr 2012 14:13:45 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V5 07/14] memcg: Add HugeTLB extension

KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:

> (2012/04/07 3:50), Aneesh Kumar K.V wrote:
>
>> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
>> 
>> This patch implements a memcg extension that allows us to control HugeTLB
>> allocations via memory controller. The extension allows to limit the
>> HugeTLB usage per control group and enforces the controller limit during
>> page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit
>> at page fault time implies that, the application will get SIGBUS signal if it
>> tries to access HugeTLB pages beyond its limit. This requires the application
>> to know beforehand how much HugeTLB pages it would require for its use.
>> 
>> The charge/uncharge calls will be added to HugeTLB code in later patch.
>> 
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
>
>
> Hmm, seems ok to me. please explain 'this patch doesn't include updates
> for memcg destroying, it will be in patch 12/14' or some...
>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>
>
> BTW, you don't put res_counter for hugeltb under CONFIG_MEM_RES_CTLR_HUGETLB...
> do you think we need the config ?


That results in more #ifdef CONFIG_MEM_RES_CTLR_HUGETLB in the
memcg code (mem_cgroup_create/mem_cgroup_read/write etc). I was not
sure we want to do that. Let me know if you think we really need to do this.


-aneesh

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