Re: [PATCH 16/27] mm: Move page mapped accounting to the node
From: Andrew Morton
Date: Tue Jun 21 2016 - 18:41:28 EST
On Tue, 21 Jun 2016 15:15:55 +0100 Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> 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.