memory tiering: count PGPROMOTE_SUCCESS when mem tiering is enabled.

memory tiering can be enabled/disabled at runtime and
sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING is used to
check it.  In migrate_misplaced_folio(), the check is missing when
PGPROMOTE_SUCCESS is incremented.  Add the missing check.

Link: https://lkml.kernel.org/r/20240724130115.793641-4-ziy@nvidia.com
Fixes: 33024536bafd ("memory tiering: hot page selection with hint page fault latency")
Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Closes: https://lore.kernel.org/linux-mm/f4ae2c9c-fe40-4807-bdb2-64cf2d716c1a@huawei.com/
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/migrate.c b/mm/migrate.c
index 923ea80ba7442b82c58f4a1680a77562ee154f98..8578a930cad1e3ac9c7aff72ba1461c179654852 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2636,7 +2636,9 @@ int migrate_misplaced_folio(struct folio *folio, struct vm_area_struct *vma,
                putback_movable_pages(&migratepages);
        if (nr_succeeded) {
                count_vm_numa_events(NUMA_PAGE_MIGRATE, nr_succeeded);
-               if (!node_is_toptier(folio_nid(folio)) && node_is_toptier(node))
+               if ((sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING)
+                   && !node_is_toptier(folio_nid(folio))
+                   && node_is_toptier(node))
                        mod_node_page_state(pgdat, PGPROMOTE_SUCCESS,
                                            nr_succeeded);
        }