ko1	2017-11-14 22:25:11 +0900 (Tue, 14 Nov 2017)

  New Revision: 60765

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60765

  Log:
    rewrite only if changed.
    
    * vm_trace.c (update_global_event_hook): rewrite ISeqs only when
      effective events are changed.

  Modified files:
    trunk/vm_trace.c
Index: vm_trace.c
===================================================================
--- vm_trace.c	(revision 60764)
+++ vm_trace.c	(revision 60765)
@@ -59,11 +59,22 @@ rb_vm_trace_mark_event_hooks(rb_hook_lis https://github.com/ruby/ruby/blob/trunk/vm_trace.c#L59
 
 /* ruby_vm_event_flags management */
 
+#define RUBY_EVENTS_TRACE_BY_ISEQ (RUBY_EVENT_LINE  | \
+				   RUBY_EVENT_CLASS | \
+				   RUBY_EVENT_END   | \
+				   RUBY_EVENT_CALL  | \
+				   RUBY_EVENT_RETURN| \
+				   RUBY_EVENT_B_CALL| \
+				   RUBY_EVENT_B_RETURN)
+
 static void
 update_global_event_hook(rb_event_flag_t vm_events)
 {
+    if ((vm_events & RUBY_EVENTS_TRACE_BY_ISEQ) !=
+	(ruby_vm_event_flags & RUBY_EVENTS_TRACE_BY_ISEQ)) {
+	rb_iseq_trace_set_all(vm_events);
+    }
     ruby_vm_event_flags = vm_events;
-    rb_iseq_trace_set_all(vm_events);
     rb_objspace_set_event_hook(vm_events);
 }
 

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