vmscan: convert mm_vmscan_lru_isolate to DEFINE_EVENT

Mel Gorman recently added some vmscan tracepoints.  Unfortunately they are
covered only global reclaim.  But we want to trace memcg reclaim too.

Thus, this patch convert them to DEFINE_TRACE macro.  it help to reuse
tracepoint definition for other similar usage (i.e.  memcg).  This patch
have no functionally change.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/trace/events/vmscan.h

@@ -170,7 +170,7 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re
 );
 
 
-TRACE_EVENT(mm_vmscan_lru_isolate,
+DECLARE_EVENT_CLASS(mm_vmscan_lru_isolate_template,
 
 	TP_PROTO(int order,
 		unsigned long nr_requested,
@@ -216,6 +216,21 @@ TRACE_EVENT(mm_vmscan_lru_isolate,
 		__entry->nr_lumpy_failed)
 );
 
+DEFINE_EVENT(mm_vmscan_lru_isolate_template, mm_vmscan_lru_isolate,
+
+	TP_PROTO(int order,
+		unsigned long nr_requested,
+		unsigned long nr_scanned,
+		unsigned long nr_taken,
+		unsigned long nr_lumpy_taken,
+		unsigned long nr_lumpy_dirty,
+		unsigned long nr_lumpy_failed,
+		int isolate_mode),
+
+	TP_ARGS(order, nr_requested, nr_scanned, nr_taken, nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed, isolate_mode)
+
+);
+
 TRACE_EVENT(mm_vmscan_writepage,
 
 	TP_PROTO(struct page *page,