linux-kernel - Re: [RFC Patch V1 07/30] mm: Use cpu_to_mem()/numa_mem

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Date:	Wed, 23 Jul 2014 11:16:53 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Christoph Lameter <cl@...two.org>, Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Jianyu Zhan <nasa4836@...il.com>, malc <av1474@...tv.ru>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Fabian Frederick <fabf@...net.be>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC Patch V1 07/30] mm: Use cpu_to_mem()/numa_mem_id() to support
 memoryless node

Hi Tejun and Christoph,
	Thanks for your suggestions and discussion. Tejun really
gives a good point to hide memoryless node interface from normal
slab users. I will rework the patch set to go that direction.
Regards!
Gerry

On 2014/7/12 3:11, Christoph Lameter wrote:
> On Fri, 11 Jul 2014, Tejun Heo wrote:
> 
>> On Fri, Jul 11, 2014 at 12:29:30PM -0500, Christoph Lameter wrote:
>>> GFP_THISNODE is mostly used by allocators that need memory from specific
>>> nodes. The use of numa_mem_id() there is useful because one will not
>>> get any memory at all when attempting to allocate from a memoryless
>>> node using GFP_THISNODE.
>>
>> As long as it's in allocator proper, it doesn't matter all that much
>> but the changes are clearly not contained, are they?
> 
> Well there is a proliferation of memory allocators recently. NUMA is often
> a second thought in those.
> 
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