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Subject[PATCH 5/5] mm/migrate: Add page movement trace event
Date
Trace the source and destination node of a page migration to help debug
memory usage.

Signed-off-by: Keith Busch <keith.busch@intel.com>
---
include/trace/events/migrate.h | 26 ++++++++++++++++++++++++++
mm/migrate.c | 1 +
2 files changed, 27 insertions(+)

diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
index d25de0cc8714..3d4b7131e547 100644
--- a/include/trace/events/migrate.h
+++ b/include/trace/events/migrate.h
@@ -6,6 +6,7 @@
#define _TRACE_MIGRATE_H

#include <linux/tracepoint.h>
+#include <trace/events/mmflags.h>

#define MIGRATE_MODE \
EM( MIGRATE_ASYNC, "MIGRATE_ASYNC") \
@@ -71,6 +72,31 @@ TRACE_EVENT(mm_migrate_pages,
__print_symbolic(__entry->mode, MIGRATE_MODE),
__print_symbolic(__entry->reason, MIGRATE_REASON))
);
+
+TRACE_EVENT(mm_migrate_move_page,
+
+ TP_PROTO(struct page *from, struct page *to, int status),
+
+ TP_ARGS(from, to, status),
+
+ TP_STRUCT__entry(
+ __field(struct page *, from)
+ __field(struct page *, to)
+ __field(int, status)
+ ),
+
+ TP_fast_assign(
+ __entry->from = from;
+ __entry->to = to;
+ __entry->status = status;
+ ),
+
+ TP_printk("node from=%d to=%d status=%d flags=%s refs=%d",
+ page_to_nid(__entry->from), page_to_nid(__entry->to),
+ __entry->status,
+ show_page_flags(__entry->from->flags & ((1UL << NR_PAGEFLAGS) - 1)),
+ page_ref_count(__entry->from))
+);
#endif /* _TRACE_MIGRATE_H */

/* This part must be outside protection */
diff --git a/mm/migrate.c b/mm/migrate.c
index 83fad87361bf..d97433da12c0 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -997,6 +997,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
page->mapping = NULL;
}
out:
+ trace_mm_migrate_move_page(page, newpage, rc);
return rc;
}

--
2.14.4
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