On Wed, Feb 08, 2017 at 04:40:55PM +1100, Gavin Shan wrote:
> When @node_reclaim_node isn't 0, the page allocator tries to reclaim
> pages if the amount of free memory in the zones are below the low
> watermark. On Power platform, none of NUMA nodes are scanned for page
> reclaim because no nodes match the condition in zone_allows_reclaim().
> On Power platform, RECLAIM_DISTANCE is set to 10 which is the distance
> of Node-A to Node-A. So the preferred node even won't be scanned for
> page reclaim.
>
> Fixes: 5f7a75acdb24 ("mm: page_alloc: do not cache reclaim distances")
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.16+
> Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
--
Mel Gorman
SUSE Labs
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