On Thu, Jul 21, 2016 at 03:11:01PM +0100, Mel Gorman wrote:

Page reclaim determines whether a pgdat is unreclaimable by examining how
many pages have been scanned since a page was freed and comparing that to
the LRU sizes. Skipped pages are not reclaim candidates but contribute to
scanned. This can prematurely mark a pgdat as unreclaimable and trigger
an OOM kill.

This patch accounts for skipped pages as a partial scan so that an
unreclaimable pgdat will still be marked as such but by scaling the cost
of a skip, it'll avoid the pgdat being marked prematurely.

Signed-off-by: Mel Gorman <redacted>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>

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