mm: migrate: Account a transhuge page properly when rate limiting
If there is excessive migration due to NUMA balancing it gets rate
limited. It does this by counting the number of pages it has migrated
recently but counts a transhuge page as 1 page. Account for it properly.
Signed-off-by: Mel Gorman <mgorman@suse.de>
diff --git a/mm/migrate.c b/mm/migrate.c
index 26537c4..f24e9cc 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1492,7 +1492,7 @@
}
/* Returns true if the node is migrate rate-limited after the update */
-bool numamigrate_update_ratelimit(pg_data_t *pgdat)
+bool numamigrate_update_ratelimit(pg_data_t *pgdat, unsigned long nr_pages)
{
bool rate_limited = false;
@@ -1510,7 +1510,7 @@
if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages)
rate_limited = true;
else
- pgdat->numabalancing_migrate_nr_pages++;
+ pgdat->numabalancing_migrate_nr_pages += nr_pages;
spin_unlock(&pgdat->numabalancing_migrate_lock);
return rate_limited;
@@ -1579,7 +1579,7 @@
* Optimal placement is no good if the memory bus is saturated and
* all the time is being spent migrating!
*/
- if (numamigrate_update_ratelimit(pgdat)) {
+ if (numamigrate_update_ratelimit(pgdat, 1)) {
put_page(page);
goto out;
}
@@ -1630,7 +1630,7 @@
* Optimal placement is no good if the memory bus is saturated and
* all the time is being spent migrating!
*/
- if (numamigrate_update_ratelimit(pgdat))
+ if (numamigrate_update_ratelimit(pgdat, HPAGE_PMD_NR))
goto out_dropref;
new_page = alloc_pages_node(node,