mm: migrate: Add a tracepoint for migrate_pages

The pgmigrate_success and pgmigrate_fail vmstat counters tells the user
about migration activity but not the type or the reason. This patch adds
a tracepoint to identify the type of page migration and why the page is
being migrated.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6c5899b9034a..ddb68a169e45 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1558,7 +1558,8 @@ int soft_offline_page(struct page *page, int flags)
                                             page_is_file_cache(page));
                 list_add(&page->lru, &pagelist);
                 ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
-                                                        false, MIGRATE_SYNC);
+                                                        false, MIGRATE_SYNC,
+                                                        MR_MEMORY_FAILURE);
                 if (ret) {
                         putback_lru_pages(&pagelist);
                         pr_info("soft offline: %#lx: migration failed %d, type %lx\n",