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, 51 insertions, 0 deletions

diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
new file mode 100644
index 000000000000..ec2a6ccfd7e5
--- /dev/null
+++ b/include/trace/events/migrate.h
@@ -0,0 +1,51 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM migrate
+
+#if !defined(_TRACE_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MIGRATE_H
+
+#define MIGRATE_MODE                                            \
+        {MIGRATE_ASYNC,         "MIGRATE_ASYNC"},               \
+        {MIGRATE_SYNC_LIGHT,    "MIGRATE_SYNC_LIGHT"},          \
+        {MIGRATE_SYNC,          "MIGRATE_SYNC"}         
+
+#define MIGRATE_REASON                                          \
+        {MR_COMPACTION,         "compaction"},                  \
+        {MR_MEMORY_FAILURE,     "memory_failure"},              \
+        {MR_MEMORY_HOTPLUG,     "memory_hotplug"},              \
+        {MR_SYSCALL,            "syscall_or_cpuset"},           \
+        {MR_MEMPOLICY_MBIND,    "mempolicy_mbind"},             \
+        {MR_CMA,                "cma"}
+
+TRACE_EVENT(mm_migrate_pages,
+
+        TP_PROTO(unsigned long succeeded, unsigned long failed,
+                 enum migrate_mode mode, int reason),
+
+        TP_ARGS(succeeded, failed, mode, reason),
+
+        TP_STRUCT__entry(
+                __field(        unsigned long,          succeeded)
+                __field(        unsigned long,          failed)
+                __field(        enum migrate_mode,      mode)
+                __field(        int,                    reason)
+        ),
+
+        TP_fast_assign(
+                __entry->succeeded      = succeeded;
+                __entry->failed         = failed;
+                __entry->mode           = mode;
+                __entry->reason         = reason;
+        ),
+
+        TP_printk("nr_succeeded=%lu nr_failed=%lu mode=%s reason=%s",
+                __entry->succeeded,
+                __entry->failed,
+                __print_symbolic(__entry->mode, MIGRATE_MODE),
+                __print_symbolic(__entry->reason, MIGRATE_REASON))
+);
+
+#endif /* _TRACE_MIGRATE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>