[PATCH 6/9] mm: zone_reclaim: compaction: increase the high order pages in the watermarks

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Prevent the scaling down to reduce the watermarks too much.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4401983..b32ecde 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1665,7 +1665,8 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
 		free_pages -= z->free_area[o].nr_free << o;
 
 		/* Require fewer higher order pages to be free */
-		min >>= 1;
+		if (o < (pageblock_order >> 2))
+			min >>= 1;
 
 		if (free_pages <= min)
 			return false;

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