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

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Message-ID: <20140821233729.GB2420@kernel>
Date:	Fri, 22 Aug 2014 07:37:29 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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

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? 

Regards,
Wanpeng Li 

>-Andi
>
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