---

yaml
---
r: 336115
b: refs/heads/master
c: 782fd30
h: refs/heads/master
i:
  336113: 078aedd
  336111: 86fa201
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a50915394f1fc02c2861d3b7ce7014788aa5066e
+refs/heads/master: 782fd30406ecb9d9b082816abe0c6008fc72a7b0

trunk/mm/page_alloc.c

@@ -2378,6 +2378,15 @@ bool gfp_pfmemalloc_allowed(gfp_t gfp_mask)
 	return !!(gfp_to_alloc_flags(gfp_mask) & ALLOC_NO_WATERMARKS);
 }
 
+/* Returns true if the allocation is likely for THP */
+static bool is_thp_alloc(gfp_t gfp_mask, unsigned int order)
+{
+	if (order == pageblock_order &&
+	    (gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE)
+		return true;
+	return false;
+}
+
 static inline struct page *
 __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 	struct zonelist *zonelist, enum zone_type high_zoneidx,
@@ -2416,7 +2425,9 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 		goto nopage;
 
 restart:
-	wake_all_kswapd(order, zonelist, high_zoneidx,
+	/* The decision whether to wake kswapd for THP is made later */
+	if (!is_thp_alloc(gfp_mask, order))
+		wake_all_kswapd(order, zonelist, high_zoneidx,
 					zone_idx(preferred_zone));
 
 	/*
@@ -2487,15 +2498,21 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 		goto got_pg;
 	sync_migration = true;
 
-	/*
-	 * If compaction is deferred for high-order allocations, it is because
-	 * sync compaction recently failed. In this is the case and the caller
-	 * requested a movable allocation that does not heavily disrupt the
-	 * system then fail the allocation instead of entering direct reclaim.
-	 */
-	if ((deferred_compaction || contended_compaction) &&
-	    (gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE)
-		goto nopage;
+	if (is_thp_alloc(gfp_mask, order)) {
+		/*
+		 * If compaction is deferred for high-order allocations, it is
+		 * because sync compaction recently failed. If this is the case
+		 * and the caller requested a movable allocation that does not
+		 * heavily disrupt the system then fail the allocation instead
+		 * of entering direct reclaim.
+		 */
+		if (deferred_compaction || contended_compaction)
+			goto nopage;
+
+		/* If process is willing to reclaim/compact then wake kswapd */
+		wake_all_kswapd(order, zonelist, high_zoneidx,
+					zone_idx(preferred_zone));
+	}
 
 	/* Try direct reclaim and then allocating */
 	page = __alloc_pages_direct_reclaim(gfp_mask, order,