[PATCH 1/3] kswapd: use reclaim order in background reclaim

[Andy Whitcroft <apw@shadowen.org>]

When an allocator has to dip below the low water mark for a
zone, kswapd is awoken to start background reclaim.  The highest
order of these dipping allocations are accumulated on the zone.
With this patch kswapd uses this hint to force reclaim at that
order via balance_pgdat().

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
---
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 428da1a..466435f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1212,6 +1212,7 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
 		.may_swap = 1,
 		.swap_cluster_max = SWAP_CLUSTER_MAX,
 		.swappiness = vm_swappiness,
+		.order = order,
 	};
 	/*
 	 * temp_priority is used to remember the scanning priority at which
-
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