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/compaction.c b/mm/compaction.c
index 00ad88395216..2c077a78487c 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -990,7 +990,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
                 nr_migrate = cc->nr_migratepages;
                 err = migrate_pages(&cc->migratepages, compaction_alloc,
                                 (unsigned long)cc, false,
-                                cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC);
+                                cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC,
+                                MR_COMPACTION);
                 update_nr_listpages(cc);
                 nr_remaining = cc->nr_migratepages;