From: Kaiyang Zhao <kaiyang2@xxxxxxxxxx>
Add a counter for the number of pages migrated across zones in vmstat
Signed-off-by: Kaiyang Zhao <zh_kaiyang@xxxxxxxxxxx>
---
include/linux/vm_event_item.h | 1 +
mm/compaction.c | 2 ++
mm/vmstat.c | 1 +
3 files changed, 4 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 8abfa1240040..be88819085b6 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -79,6 +79,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
KCOMPACTD_WAKE,
KCOMPACTD_MIGRATE_SCANNED, KCOMPACTD_FREE_SCANNED,
+ COMPACT_CROSS_ZONE_MIGRATED,
#endif
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
diff --git a/mm/compaction.c b/mm/compaction.c
index 03b5c4debc17..dea10ad8ec64 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2552,6 +2552,8 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
count_compact_events(COMPACTMIGRATE_SCANNED, cc->total_migrate_scanned);
count_compact_events(COMPACTFREE_SCANNED, cc->total_free_scanned);
+ if (dst_zone != cc->zone)
+ count_compact_events(COMPACT_CROSS_ZONE_MIGRATED, nr_succeeded);
trace_mm_compaction_end(cc, start_pfn, end_pfn, sync, ret);
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c28046371b45..98af82e65ad9 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1324,6 +1324,7 @@ const char * const vmstat_text[] = {
"compact_daemon_wake",
"compact_daemon_migrate_scanned",
"compact_daemon_free_scanned",
+ "compact_cross_zone_migrated",
#endif
#ifdef CONFIG_HUGETLB_PAGE
--
2.40.1
