linux-kernel - Re: [PATCH -V4 04/10] memcg: Add HugeTLB extension

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Date:	Mon, 19 Mar 2012 16:00:35 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.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 -V4 04/10] memcg: Add HugeTLB extension

(2012/03/19 15:52), Aneesh Kumar K.V wrote:

> On Mon, 19 Mar 2012 11:38:38 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
>> (2012/03/17 2:39), 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.
>>>
>>
>>
>> If you write some details here, it will be helpful for review and
>> seeing log after merge.
> 
> Will add more info.
> 
>>
>>
>>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
>>> ---
>>>  include/linux/hugetlb.h    |    1 +
>>>  include/linux/memcontrol.h |   42 +++++++++++++
>>>  init/Kconfig               |    8 +++
>>>  mm/hugetlb.c               |    2 +-
>>>  mm/memcontrol.c            |  138 ++++++++++++++++++++++++++++++++++++++++++++
>>>  5 files changed, 190 insertions(+), 1 deletions(-)
> 
> ....
> 
>>> +#ifdef CONFIG_MEM_RES_CTLR_HUGETLB
>>> +static bool mem_cgroup_have_hugetlb_usage(struct mem_cgroup *memcg)
>>> +{
>>> +	int idx;
>>> +	for (idx = 0; idx < hugetlb_max_hstate; idx++) {
>>> +		if (memcg->hugepage[idx].usage > 0)
>>> +			return 1;
>>> +	}
>>> +	return 0;
>>> +}
>>
>>
>> Please use res_counter_read_u64() rather than reading the value directly.
>>
> 
> The open-coded variant is mostly derived from mem_cgroup_force_empty. I
> have updated the patch to use res_counter_read_u64. 
> 

Ah, ok. it's(maybe) my bad. I'll schedule a fix.


Thanks,
-Kame

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