Date: Fri, 11 Jul 2014 14:11:02 -0500 (CDT)
From: Christoph Lameter <cl@gentwo.org>
To: Tejun Heo <tj@kernel.org>
cc: Jiang Liu <jiang.liu@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, David Rientjes <rientjes@google.com>,
        Mike Galbraith <umgwanakikbuti@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Vladimir Davydov <vdavydov@parallels.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Rik van Riel <riel@redhat.com>, Wanpeng Li <liwanp@linux.vnet.ibm.com>,
        Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Jianyu Zhan <nasa4836@gmail.com>, malc <av1474@comtv.ru>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Fabian Frederick <fabf@skynet.be>, Tony Luck <tony.luck@intel.com>,
        linux-mm@kvack.org, linux-hotplug@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC Patch V1 07/30] mm: Use cpu_to_mem()/numa_mem_id() to
 support memoryless node
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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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