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

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Date:	Fri, 11 Jul 2014 12:24:51 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...two.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	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

On Fri, Jul 11, 2014 at 11:19:14AM -0500, Christoph Lameter wrote:
> Yes that works. But if we want a consistent node to allocate from (and
> avoid the fallbacks) then we need this patch. I think this is up to those
> needing memoryless nodes to figure out what semantics they need.

I'm not following what you're saying.  Are you saying that we need to
spread numa_mem_id() all over the place for GFP_THISNODE users on
memless nodes?  There aren't that many users of GFP_THISNODE.
Wouldn't it make far more sense to just change them?  Or just
introduce a new GFP flag GFP_CLOSE_OR_BUST which allows falling back
to the nearest local node for memless nodes.  There's no reason to
leak this information outside allocator proper.

Thanks.

-- 
tejun
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