mm: numa: Structures for Migrate On Fault per NUMA migration rate limiting

This defines the per-node data used by Migrate On Fault in order to
rate limit the migration. The rate limiting is applied independently
to each destination node.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a23923ba8263..28601fdfcdb2 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -717,6 +717,19 @@ typedef struct pglist_data {
         struct task_struct *kswapd;     /* Protected by lock_memory_hotplug() */
         int kswapd_max_order;
         enum zone_type classzone_idx;
+#ifdef CONFIG_NUMA_BALANCING
+        /*
+         * Lock serializing the per destination node AutoNUMA memory
+         * migration rate limiting data.
+         */
+        spinlock_t numabalancing_migrate_lock;
+
+        /* Rate limiting time interval */
+        unsigned long numabalancing_migrate_next_window;
+
+        /* Number of pages migrated during the rate limiting time interval */
+        unsigned long numabalancing_migrate_nr_pages;
+#endif
 } pg_data_t;
 
 #define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)