linux-kernel - Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting

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Date:	Fri, 22 Aug 2014 09:34:30 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Michal Hocko <mhocko@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Hillf Danton <dhillf@...il.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting

Hello Wanpeng

On 08/22/2014 07:37 AM, Wanpeng Li wrote:
> Hi Andi,
> On Fri, Apr 12, 2013 at 05:22:37PM +0200, Andi Kleen wrote:
>> On Fri, Apr 12, 2013 at 07:29:07AM +0800, Wanpeng Li wrote:
>>> Ping Andi,
>>> On Thu, Apr 04, 2013 at 05:09:08PM +0800, Wanpeng Li wrote:
>>>> order >= MAX_ORDER pages are only allocated at boot stage using the 
>>>> bootmem allocator with the "hugepages=xxx" option. These pages are never 
>>>> free after boot by default since it would be a one-way street(>= MAX_ORDER
>>>> pages cannot be allocated later), but if administrator confirm not to 
>>>> use these gigantic pages any more, these pinned pages will waste memory
>>>> since other users can't grab free pages from gigantic hugetlb pool even
>>>> if OOM, it's not flexible.  The patchset add hugetlb gigantic page pools
>>>> shrink supporting. Administrator can enable knob exported in sysctl to
>>>> permit to shrink gigantic hugetlb pool.
>>
>>
>> I originally didn't allow this because it's only one way and it seemed
>> dubious.  I've been recently working on a new patchkit to allocate
>> GB pages from CMA. With that freeing actually makes sense, as 
>> the pages can be reallocated.
>>
> 
> More than one year past, If your allocate GB pages from CMA merged? 

commit 944d9fec8d7aee3f2e16573e9b6a16634b33f403
Author: Luiz Capitulino <lcapitulino@...hat.com>
Date:   Wed Jun 4 16:07:13 2014 -0700

    hugetlb: add support for gigantic page allocation at runtime


> 
> Regards,
> Wanpeng Li 
> 
>> -Andi
>>
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-- 
Thanks.
Zhang Yanfei
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