linux-kernel - Re: [PATCH] page_alloc: skip cpuset enforcement for lower zone allocations (v5)

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Message-ID: <20140530211831.GN25366@two.firstfloor.org>
Date:	Fri, 30 May 2014 23:18:31 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...two.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Li Zefan <lizefan@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Lai Jiangshan <laijs@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] page_alloc: skip cpuset enforcement for lower zone
 allocations (v5)

On Fri, May 30, 2014 at 08:50:56AM -0500, Christoph Lameter wrote:
> On Thu, 29 May 2014, David Rientjes wrote:
> 
> > When I said that my point about mempolicies needs more thought, I wasn't
> > expecting that there would be no discussion -- at least _something_ that
> > would say why we don't care about the mempolicy case.
> 
> Lets get Andi involved here too.

I'm not fully sure about the use case for this. On the NUMA systems
I'm aware of usually only node 0 has <4GB, so mem policy
is pointless.

But anyways it seems ok to me to ignore mempolicies. Mempolicies
are primarily for user space, which doesn't use GFP_DMA32.

-ANdi
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