mm: introduce compaction and migration for ballooned pages
[~shefty/rdma-dev.git] / mm / compaction.c
index 694eaabaaebdc0827c93d81c97f200fc534a115e..470474c03b6123aa57876b1aac7006964aca9028 100644 (file)
@@ -14,6 +14,7 @@
 #include <linux/backing-dev.h>
 #include <linux/sysctl.h>
 #include <linux/sysfs.h>
+#include <linux/balloon_compaction.h>
 #include "internal.h"
 
 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
@@ -565,9 +566,24 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                        goto next_pageblock;
                }
 
-               /* Check may be lockless but that's ok as we recheck later */
-               if (!PageLRU(page))
+               /*
+                * Check may be lockless but that's ok as we recheck later.
+                * It's possible to migrate LRU pages and balloon pages
+                * Skip any other type of page
+                */
+               if (!PageLRU(page)) {
+                       if (unlikely(balloon_page_movable(page))) {
+                               if (locked && balloon_page_isolate(page)) {
+                                       /* Successfully isolated */
+                                       cc->finished_update_migrate = true;
+                                       list_add(&page->lru, migratelist);
+                                       cc->nr_migratepages++;
+                                       nr_isolated++;
+                                       goto check_compact_cluster;
+                               }
+                       }
                        continue;
+               }
 
                /*
                 * PageLRU is set. lru_lock normally excludes isolation
@@ -621,6 +637,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                cc->nr_migratepages++;
                nr_isolated++;
 
+check_compact_cluster:
                /* Avoid isolating too much */
                if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) {
                        ++low_pfn;