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

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Message-ID: <20140822040420.GA4756@kernel>
Date:	Fri, 22 Aug 2014 12:04:20 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.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

On Fri, Aug 22, 2014 at 09:34:30AM +0800, Zhang Yanfei wrote:
>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
>
>

Ah, thanks for your pointing out.

Regards,
Wanpeng Li 

>> 
>> Regards,
>> Wanpeng Li 
>> 
>>> -Andi
>>>
>>> --
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>> 
>
>
>-- 
>Thanks.
>Zhang Yanfei
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
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