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, 4 insertions, 2 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index d04a8a54c294..66e90ecc2350 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -961,7 +961,8 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest,
 
         if (!list_empty(&pagelist)) {
                 err = migrate_pages(&pagelist, new_node_page, dest,
-                                                        false, MIGRATE_SYNC);
+                                                        false, MIGRATE_SYNC,
+                                                        MR_SYSCALL);
                 if (err)
                         putback_lru_pages(&pagelist);
         }
@@ -1202,7 +1203,8 @@ static long do_mbind(unsigned long start, unsigned long len,
                 if (!list_empty(&pagelist)) {
                         nr_failed = migrate_pages(&pagelist, new_vma_page,
                                                 (unsigned long)vma,
-                                                false, MIGRATE_SYNC);
+                                                false, MIGRATE_SYNC,
+                                                MR_MEMPOLICY_MBIND);
                         if (nr_failed)
                                 putback_lru_pages(&pagelist);
                 }