--- a/hotspot/src/share/vm/logging/logConfiguration.cpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logConfiguration.cpp	Fri Dec 04 20:04:59 2015 +0000
@@ -39,6 +39,7 @@
 
 LogOutput** LogConfiguration::_outputs = NULL;
 size_t      LogConfiguration::_n_outputs = 0;
+bool        LogConfiguration::_post_initialized = false;
 
 void LogConfiguration::post_initialize() {
   assert(LogConfiguration_lock != NULL, "Lock must be initialized before post-initialization");
@@ -51,6 +52,8 @@
     MutexLocker ml(LogConfiguration_lock);
     describe(log.trace_stream());
   }
+
+  _post_initialized = true;
 }
 
 void LogConfiguration::initialize(jlong vm_start_time) {
@@ -422,3 +425,12 @@
               "\t Turn off all logging, including warnings and errors,\n"
               "\t and then enable messages tagged with 'rt' using 'trace' level to file 'rttrace.txt'.\n");
 }
+
+void LogConfiguration::rotate_all_outputs() {
+  for (size_t idx = 0; idx < _n_outputs; idx++) {
+    if (_outputs[idx]->is_rotatable()) {
+      _outputs[idx]->rotate(true);
+    }
+  }
+}
+

--- a/hotspot/src/share/vm/logging/logConfiguration.hpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logConfiguration.hpp	Fri Dec 04 20:04:59 2015 +0000
@@ -40,6 +40,7 @@
  private:
   static LogOutput**  _outputs;
   static size_t       _n_outputs;
+  static bool         _post_initialized;
 
   // Create a new output. Returns NULL if failed.
   static LogOutput* new_output(char* name, const char* options = NULL);
@@ -94,6 +95,13 @@
 
   // Prints usage help for command line log configuration.
   static void print_command_line_help(FILE* out);
+
+  static bool is_post_initialized() {
+    return _post_initialized;
+  }
+
+  // Rotates all LogOutput
+  static void rotate_all_outputs();
 };
 
 #endif // SHARE_VM_LOGGING_LOGCONFIGURATION_HPP

--- a/hotspot/src/share/vm/logging/logDiagnosticCommand.cpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logDiagnosticCommand.cpp	Fri Dec 04 20:04:59 2015 +0000
@@ -35,13 +35,15 @@
     _what("what", "Configures what tags to log.", "STRING", false),
     _decorators("decorators", "Configures which decorators to use. Use 'none' or an empty value to remove all.", "STRING", false),
     _disable("disable", "Turns off all logging and clears the log configuration.", "BOOLEAN", false),
-    _list("list", "Lists current log configuration.", "BOOLEAN", false) {
+    _list("list", "Lists current log configuration.", "BOOLEAN", false),
+    _rotate("rotate", "Rotates all logs.", "BOOLEAN", false) {
   _dcmdparser.add_dcmd_option(&_output);
   _dcmdparser.add_dcmd_option(&_output_options);
   _dcmdparser.add_dcmd_option(&_what);
   _dcmdparser.add_dcmd_option(&_decorators);
   _dcmdparser.add_dcmd_option(&_disable);
   _dcmdparser.add_dcmd_option(&_list);
+  _dcmdparser.add_dcmd_option(&_rotate);
 }
 
 int LogDiagnosticCommand::num_arguments() {
@@ -86,6 +88,11 @@
     any_command = true;
   }
 
+  if (_rotate.has_value()) {
+    LogConfiguration::rotate_all_outputs();
+    any_command = true;
+  }
+
   if (!any_command) {
     // If no argument was provided, print usage
     print_help(LogDiagnosticCommand::name());

--- a/hotspot/src/share/vm/logging/logDiagnosticCommand.hpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logDiagnosticCommand.hpp	Fri Dec 04 20:04:59 2015 +0000
@@ -43,6 +43,7 @@
   DCmdArgument<char *> _decorators;
   DCmdArgument<bool> _disable;
   DCmdArgument<bool> _list;
+  DCmdArgument<bool> _rotate;
 
  public:
   LogDiagnosticCommand(outputStream* output, bool heap_allocated);
@@ -55,7 +56,7 @@
   }
 
   static const char* description() {
-    return "Lists, enables, disables or changes a log output configuration.";
+    return "Lists current log configuration, enables/disables/configures a log output, or rotates all logs.";
   }
 
   // Used by SecurityManager. This DCMD requires ManagementPermission = control.

--- a/hotspot/src/share/vm/logging/logFileOutput.cpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logFileOutput.cpp	Fri Dec 04 20:04:59 2015 +0000
@@ -155,12 +155,7 @@
   int written = LogFileStreamOutput::write(decorations, msg);
   _current_size += written;
 
-  if (should_rotate()) {
-    MutexLockerEx ml(&_rotation_lock, true /* no safepoint check */);
-    if (should_rotate()) {
-      rotate();
-    }
-  }
+  rotate(false);
 
   return written;
 }
@@ -182,7 +177,14 @@
   }
 }
 
-void LogFileOutput::rotate() {
+void LogFileOutput::rotate(bool force) {
+
+  if (!should_rotate(force)) {
+    return;
+  }
+
+  MutexLockerEx ml(&_rotation_lock, true /* no safepoint check */);
+
   // Archive the current log file
   archive();
 

--- a/hotspot/src/share/vm/logging/logFileOutput.hpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logFileOutput.hpp	Fri Dec 04 20:04:59 2015 +0000
@@ -58,13 +58,13 @@
   size_t  _current_size;
 
   void archive();
-  void rotate();
   bool configure_rotation(const char* options);
   char *make_file_name(const char* file_name, const char* pid_string, const char* timestamp_string);
   static size_t parse_value(const char* value_str);
 
-  bool should_rotate() const {
-    return _file_count > 0 && _rotate_size > 0 && _current_size >= _rotate_size;
+  bool should_rotate(bool force) {
+    return is_rotatable() &&
+             (force || (_rotate_size > 0 && _current_size >= _rotate_size));
   }
 
  public:
@@ -73,6 +73,12 @@
   virtual bool initialize(const char* options);
   virtual int write(const LogDecorations& decorations, const char* msg);
 
+  virtual bool is_rotatable() {
+    return LogConfiguration::is_post_initialized() && (_file_count > 0);
+  }
+
+  virtual void rotate(bool force);
+
   virtual const char* name() const {
     return _name;
   }

--- a/hotspot/src/share/vm/logging/logOutput.hpp	Fri Dec 04 16:19:09 2015 +0000
+++ b/hotspot/src/share/vm/logging/logOutput.hpp	Fri Dec 04 20:04:59 2015 +0000
@@ -75,6 +75,14 @@
   virtual const char* name() const = 0;
   virtual bool initialize(const char* options) = 0;
   virtual int write(const LogDecorations &decorations, const char* msg) = 0;
+
+  virtual bool is_rotatable() {
+    return false;
+  }
+
+  virtual void rotate(bool force) {
+    // Do nothing by default.
+  }
 };
 
 #endif // SHARE_VM_LOGGING_LOGOUTPUT_HPP