src/share/vm/utilities/ostream.cpp

@@ -660,17 +660,17 @@
 // function directly. Currently, it is safe to rotate log at safepoint through VMThread.
 // That is, no mutator threads and concurrent GC threads run parallel with VMThread to
 // write to gc log file at safepoint. If in future, changes made for mutator threads or
 // concurrent GC threads to run parallel with VMThread at safepoint, write and rotate_log
 // must be synchronized.
-void gcLogFileStream::rotate_log() {
+void gcLogFileStream::rotate_log(bool force, outputStream* out) {
   char time_msg[FILENAMEBUFLEN];
   char time_str[EXTRACHARLEN];
   char current_file_name[FILENAMEBUFLEN];
   char renamed_file_name[FILENAMEBUFLEN];
 
-  if (_bytes_written < (jlong)GCLogFileSize) {
+  if (!should_rotate(force)) {
     return;
   }
 
 #ifdef ASSERT
   Thread *thread = Thread::current();

@@ -683,10 +683,15 @@
     rewind();
     _bytes_written = 0L;
     jio_snprintf(time_msg, sizeof(time_msg), "File  %s rotated at %s\n",
                  _file_name, os::local_time_string((char *)time_str, sizeof(time_str)));
     write(time_msg, strlen(time_msg));
+
+    if (out != NULL) {
+      out->print(time_msg);
+    }
+
     dump_loggc_header();
     return;
   }
 
 #if defined(_WINDOWS)

@@ -704,16 +709,22 @@
   if (_file != NULL) {
     jio_snprintf(renamed_file_name, filename_len + EXTRACHARLEN, "%s.%d",
                  _file_name, _cur_file_num);
     jio_snprintf(current_file_name, filename_len + EXTRACHARLEN, "%s.%d" CURRENTAPPX,
                  _file_name, _cur_file_num);
-    jio_snprintf(time_msg, sizeof(time_msg), "%s GC log file has reached the"
-                           " maximum size. Saved as %s\n",
+
+    const char* msg = force ? "GC log rotation request has been received."
+                            : "GC log file has reached the maximum size.";
+    jio_snprintf(time_msg, sizeof(time_msg), "%s %s Saved as %s\n",
                            os::local_time_string((char *)time_str, sizeof(time_str)),
-                           renamed_file_name);
+                                                         msg, renamed_file_name);
     write(time_msg, strlen(time_msg));
 
+    if (out != NULL) {
+      out->print(time_msg);
+    }
+
     fclose(_file);
     _file = NULL;
 
     bool can_rename = true;
     if (access(current_file_name, F_OK) != 0) {

@@ -750,10 +761,15 @@
                  "%s.%d", _file_name, _cur_file_num);
     jio_snprintf(time_msg, sizeof(time_msg), "%s GC log file created %s\n",
                            os::local_time_string((char *)time_str, sizeof(time_str)),
                            current_file_name);
     write(time_msg, strlen(time_msg));
+
+    if (out != NULL) {
+      out->print(time_msg);
+    }
+
     dump_loggc_header();
     // remove the existing file
     if (access(current_file_name, F_OK) == 0) {
       if (remove(current_file_name) != 0) {
         warning("Could not delete existing file %s\n", current_file_name);