1 files changed, 7 insertions, 0 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index a18201a8124e..570426edcadf 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1047,6 +1047,12 @@ typedef enum {
 } isolate_migrate_t;
 
 /*
+ * Allow userspace to control policy on scanning the unevictable LRU for
+ * compactable pages.
+ */
+int sysctl_compact_unevictable_allowed __read_mostly = 1;
+
+/*
  * Isolate all pages that can be migrated from the first suitable block,
  * starting at the block pointed to by the migrate scanner pfn within
  * compact_control.
@@ -1057,6 +1063,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
         unsigned long low_pfn, end_pfn;
         struct page *page;
         const isolate_mode_t isolate_mode =
+                (sysctl_compact_unevictable_allowed ? ISOLATE_UNEVICTABLE : 0) |
                 (cc->mode == MIGRATE_ASYNC ? ISOLATE_ASYNC_MIGRATE : 0);
 
         /*