linux-kernel - Re: [PATCH] page_alloc: skip cpuset enforcement for lower zone allocations (v3)

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Message-ID: <20140529184649.GA20609@amt.cnet>
Date:	Thu, 29 May 2014 15:46:49 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	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>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] page_alloc: skip cpuset enforcement for lower zone
 allocations (v3)


On Wed, May 28, 2014 at 06:45:04PM -0500, Christoph Lameter wrote:

<snip>

Much cleaner, sent v4 with your suggestions.

> Why call __alloc_pages_nodemask at all if you want to skip the node
> handling? Punt to alloc_pages()

- __alloc_pages_nodemask ignored GFP_DMA32 on older kernels, so the
interface should remain functional.
- There are others callers of alloc_pages(GFP_DMA) that can suffer
from the same problem.
- Mirrors mempolicy behaviour.


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