linux-kernel - Re: [PATCH 16/27] mm: Move page mapped accounting to the node

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Message-Id: <20160621153206.2d72954b22dddee7f1d8b9a5@linux-foundation.org>
Date:	Tue, 21 Jun 2016 15:32:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/27] mm: Move page mapped accounting to the node

On Tue, 21 Jun 2016 15:15:55 +0100 Mel Gorman <mgorman@...hsingularity.net> wrote:

> Reclaim makes decisions based on the number of pages that are mapped
> but it's mixing node and zone information. Account NR_FILE_MAPPED and
> NR_ANON_PAGES pages on the node.

<wading through rejects>

Boy, the difference between

	__mod_zone_page_state(page_zone(page), ...

and

	__mod_node_page_state(page_pgdat(page), ...

is looking subtle.  When and why to use one versus the other.  I'm not
seeing any explanation of this in there but haven't yet looked hard.