---

yaml
---
r: 230715
b: refs/heads/master
c: 9927af7
h: refs/heads/master
i:
  230713: 3f83cc0
  230711: 005b693
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7f0f24967b0349798803260b2e4bf347cffa1990
+refs/heads/master: 9927af740b1b9b1e769310bd0b91425e8047b803

trunk/mm/compaction.c

@@ -240,6 +240,7 @@ static unsigned long isolate_migratepages(struct zone *zone,
 					struct compact_control *cc)
 {
 	unsigned long low_pfn, end_pfn;
+	unsigned long last_pageblock_nr = 0, pageblock_nr;
 	unsigned long nr_scanned = 0, nr_isolated = 0;
 	struct list_head *migratelist = &cc->migratepages;
 
@@ -280,6 +281,20 @@ static unsigned long isolate_migratepages(struct zone *zone,
 		if (PageBuddy(page))
 			continue;
 
+		/*
+		 * For async migration, also only scan in MOVABLE blocks. Async
+		 * migration is optimistic to see if the minimum amount of work
+		 * satisfies the allocation
+		 */
+		pageblock_nr = low_pfn >> pageblock_order;
+		if (!cc->sync && last_pageblock_nr != pageblock_nr &&
+				get_pageblock_migratetype(page) != MIGRATE_MOVABLE) {
+			low_pfn += pageblock_nr_pages;
+			low_pfn = ALIGN(low_pfn, pageblock_nr_pages) - 1;
+			last_pageblock_nr = pageblock_nr;
+			continue;
+		}
+
 		/* Try isolate the page */
 		if (__isolate_lru_page(page, ISOLATE_BOTH, 0) != 0)
 			continue;