On Fri, Jul 08, 2016 at 10:35:06AM +0100, Mel Gorman wrote:

If a page is about to be dirtied then the page allocator attempts to limit
the total number of dirty pages that exists in any given zone.  The call
to node_dirty_ok is expensive so this patch records if the last pgdat
examined hit the dirty limits.  In some cases, this reduces the number of
calls to node_dirty_ok().

Signed-off-by: Mel Gorman <redacted>
Acked-by: Vlastimil Babka <redacted>

I guess...

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

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