8275334: Move class loading Events to a separate section in hs_err files

Backport-of: bb7dacdc78ad50797900e7e9610a1ed8e7ab1b00

Author: MBaesken

src/hotspot/share/classfile/classLoader.cpp

@@ -1141,7 +1141,7 @@ InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TR
 
   const char* const class_name = name->as_C_string();
 
-  EventMark m("loading class %s", class_name);
+  EventMarkClassLoading m("Loading class %s", class_name);
 
   const char* const file_name = file_name_for_class_name(class_name,
                                                          name->utf8_length());

src/hotspot/share/utilities/events.cpp

@@ -39,6 +39,7 @@ StringEventLog* Events::_vm_operations = NULL;
 ExceptionsEventLog* Events::_exceptions = NULL;
 StringEventLog* Events::_redefinitions = NULL;
 UnloadingEventLog* Events::_class_unloading = NULL;
+StringEventLog* Events::_class_loading = NULL;
 StringEventLog* Events::_deopt_messages = NULL;
 StringEventLog* Events::_dll_messages = NULL;
 
@@ -97,6 +98,7 @@ void Events::init() {
     _exceptions = new ExceptionsEventLog("Internal exceptions", "exc");
     _redefinitions = new StringEventLog("Classes redefined", "redef");
     _class_unloading = new UnloadingEventLog("Classes unloaded", "unload");
+    _class_loading = new StringEventLog("Classes loaded", "load");
     _deopt_messages = new StringEventLog("Deoptimization events", "deopt");
     _dll_messages = new StringEventLog("Dll operation events", "dll");
   }

src/hotspot/share/utilities/events.hpp

@@ -238,6 +238,9 @@ class Events : AllStatic {
 
   // Class unloading events
   static UnloadingEventLog* _class_unloading;
+
+  // Class loading events
+  static StringEventLog* _class_loading;
  public:
 
   // Print all event logs; limit number of events per event log to be printed with max
@@ -263,6 +266,8 @@ class Events : AllStatic {
 
   static void log_class_unloading(Thread* thread, InstanceKlass* ik);
 
+  static void log_class_loading(Thread* thread, const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
+
   static void log_deopt_message(Thread* thread, const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
 
   static void log_dll_message(Thread* thread, const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
@@ -319,6 +324,15 @@ inline void Events::log_class_unloading(Thread* thread, InstanceKlass* ik) {
   }
 }
 
+inline void Events::log_class_loading(Thread* thread, const char* format, ...) {
+  if (LogEvents && _class_loading != NULL) {
+    va_list ap;
+    va_start(ap, format);
+    _class_loading->logv(thread, format, ap);
+    va_end(ap);
+  }
+}
+
 inline void Events::log_deopt_message(Thread* thread, const char* format, ...) {
   if (LogEvents && _deopt_messages != NULL) {
     va_list ap;
@@ -487,4 +501,7 @@ typedef EventMarkWithLogFunction<Events::log> EventMark;
 // These end up in the vm_operation log.
 typedef EventMarkWithLogFunction<Events::log_vm_operation> EventMarkVMOperation;
 
+// These end up in the class loading log.
+typedef EventMarkWithLogFunction<Events::log_class_loading> EventMarkClassLoading;
+
 #endif // SHARE_UTILITIES_EVENTS_HPP