linux-kernel - Re: [PART3 Patch v2 13/14] page_alloc: use N_MEMORY instead N_HIGH_MEMORY change the node

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Date:	Thu, 15 Nov 2012 16:29:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wen Congyang <wency@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-doc@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Lin feng <linfeng@...fujitsu.com>
Subject: Re: [PART3 Patch v2 13/14] page_alloc: use N_MEMORY instead
 N_HIGH_MEMORY change the node_states initialization

On Thu, 15 Nov 2012 16:57:36 +0800
Wen Congyang <wency@...fujitsu.com> wrote:

> N_HIGH_MEMORY stands for the nodes that has normal or high memory.
> N_MEMORY stands for the nodes that has any memory.
> 
> The code here need to handle with the nodes which have memory, we should
> use N_MEMORY instead.
> 
> Since we introduced N_MEMORY, we update the initialization of node_states.

reset_zone_present_pages() has been removed by the recently-queued
revert-mm-fix-up-zone-present-pages.patch, so I dropped that hunk.

We still have

akpm:/usr/src/25> grep N_HIGH_MEMORY mm/page_alloc.c
        [N_HIGH_MEMORY] = { { [0] = 1UL } },
                        node_set_state(nid, N_HIGH_MEMORY);
                        if (N_NORMAL_MEMORY != N_HIGH_MEMORY &&

which I hope is correct.  Can you please check it?
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