[PATCH 15/15] fixup! mm, compaction: more reliably increase direct compaction priority

[Vlastimil Babka]

---
 mm/page_alloc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fa49eb4a5919..e8a0d33cfb67 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3268,6 +3268,14 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
 	}
 
 	/*
+	 * Compaction considers all the zones as unfixably fragmented and we
+	 * are on the highest priority, which means it can't be due to
+	 * heuristics and it doesn't really make much sense to retry.
+	 */
+	if (compaction_failed(compact_result))
+		return false;
+
+	/*
 	 * The remaining possibility is that compaction made progress and
 	 * created a high-order page, but it was allocated by somebody else.
 	 * To prevent thrashing, limit the number of retries in such case.
-- 
2.8.2