--- a/hotspot/src/share/tools/LogCompilation/README	Thu Sep 12 18:13:28 2013 -0700
+++ b/hotspot/src/share/tools/LogCompilation/README	Fri Sep 13 04:16:54 2013 -0700
@@ -4,14 +4,14 @@
 requires a 1.5 JDK to build and simply typing make should build it.
 
 It produces a jar file, logc.jar, that can be run on the
-hotspot.log from LogCompilation output like this:
+HotSpot log (by default, hotspot_pid{pid}.log) from LogCompilation output like this:
 
-  java -jar logc.jar hotspot.log
+  java -jar logc.jar hotspot_pid1234.log
 
 This will produce something like the normal PrintCompilation output.
 Adding the -i option with also report inlining like PrintInlining.
 
-More information about the LogCompilation output can be found at 
+More information about the LogCompilation output can be found at
 
 https://wikis.oracle.com/display/HotSpotInternals/LogCompilation+overview
 https://wikis.oracle.com/display/HotSpotInternals/PrintCompilation

--- a/hotspot/src/share/vm/runtime/arguments.cpp	Thu Sep 12 18:13:28 2013 -0700
+++ b/hotspot/src/share/vm/runtime/arguments.cpp	Fri Sep 13 04:16:54 2013 -0700
@@ -3337,6 +3337,33 @@
   return shared_archive_path;
 }
 
+#ifndef PRODUCT
+// Determine whether LogVMOutput should be implicitly turned on.
+static bool use_vm_log() {
+  if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
+      PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
+      PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
+      PrintAssembly || TraceDeoptimization || TraceDependencies ||
+      (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
+    return true;
+  }
+
+#ifdef COMPILER1
+  if (PrintC1Statistics) {
+    return true;
+  }
+#endif // COMPILER1
+
+#ifdef COMPILER2
+  if (PrintOptoAssembly || PrintOptoStatistics) {
+    return true;
+  }
+#endif // COMPILER2
+
+  return false;
+}
+#endif // PRODUCT
+
 // Parse entry point called from JNI_CreateJavaVM
 
 jint Arguments::parse(const JavaVMInitArgs* args) {
@@ -3630,7 +3657,13 @@
       NmethodSweepFraction = 1;
     }
   }
-#endif
+
+  if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
+    if (use_vm_log()) {
+      LogVMOutput = true;
+    }
+  }
+#endif // PRODUCT
 
   if (PrintCommandLineFlags) {
     CommandLineFlags::printSetFlags(tty);

--- a/hotspot/src/share/vm/runtime/deoptimization.cpp	Thu Sep 12 18:13:28 2013 -0700
+++ b/hotspot/src/share/vm/runtime/deoptimization.cpp	Fri Sep 13 04:16:54 2013 -0700
@@ -1751,7 +1751,7 @@
   else    return trap_state & ~DS_RECOMPILE_BIT;
 }
 //---------------------------format_trap_state---------------------------------
-// This is used for debugging and diagnostics, including hotspot.log output.
+// This is used for debugging and diagnostics, including LogFile output.
 const char* Deoptimization::format_trap_state(char* buf, size_t buflen,
                                               int trap_state) {
   DeoptReason reason      = trap_state_reason(trap_state);
@@ -1828,7 +1828,7 @@
   return buf;
 }
 
-// This is used for debugging and diagnostics, including hotspot.log output.
+// This is used for debugging and diagnostics, including LogFile output.
 const char* Deoptimization::format_trap_request(char* buf, size_t buflen,
                                                 int trap_request) {
   jint unloaded_class_index = trap_request_index(trap_request);

--- a/hotspot/src/share/vm/runtime/globals.hpp	Thu Sep 12 18:13:28 2013 -0700
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Fri Sep 13 04:16:54 2013 -0700
@@ -880,7 +880,7 @@
           "stay alive at the expense of JVM performance")                   \
                                                                             \
   diagnostic(bool, LogCompilation, false,                                   \
-          "Log compilation activity in detail to hotspot.log or LogFile")   \
+          "Log compilation activity in detail to LogFile")                  \
                                                                             \
   product(bool, PrintCompilation, false,                                    \
           "Print compilations")                                             \
@@ -2498,16 +2498,17 @@
          "Print all VM flags with default values and descriptions and exit")\
                                                                             \
   diagnostic(bool, SerializeVMOutput, true,                                 \
-         "Use a mutex to serialize output to tty and hotspot.log")          \
+         "Use a mutex to serialize output to tty and LogFile")              \
                                                                             \
   diagnostic(bool, DisplayVMOutput, true,                                   \
          "Display all VM output on the tty, independently of LogVMOutput")  \
                                                                             \
-  diagnostic(bool, LogVMOutput, trueInDebug,                                \
-         "Save VM output to hotspot.log, or to LogFile")                    \
+  diagnostic(bool, LogVMOutput, false,                                      \
+         "Save VM output to LogFile")                                       \
                                                                             \
   diagnostic(ccstr, LogFile, NULL,                                          \
-         "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
+         "If LogVMOutput or LogCompilation is on, save VM output to "       \
+         "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)") \
                                                                             \
   product(ccstr, ErrorFile, NULL,                                           \
          "If an error occurs, save the error data to this file "            \

--- a/hotspot/src/share/vm/utilities/ostream.cpp	Thu Sep 12 18:13:28 2013 -0700
+++ b/hotspot/src/share/vm/utilities/ostream.cpp	Fri Sep 13 04:16:54 2013 -0700
@@ -592,7 +592,7 @@
 
 void defaultStream::init_log() {
   // %%% Need a MutexLocker?
-  const char* log_name = LogFile != NULL ? LogFile : "hotspot.log";
+  const char* log_name = LogFile != NULL ? LogFile : "hotspot_pid%p.log";
   const char* try_name = make_log_name(log_name, NULL);
   fileStream* file = new(ResourceObj::C_HEAP, mtInternal) fileStream(try_name);
   if (!file->is_open()) {
@@ -603,14 +603,15 @@
     // Note:  This feature is for maintainer use only.  No need for L10N.
     jio_print(warnbuf);
     FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
-    try_name = make_log_name("hs_pid%p.log", os::get_temp_directory());
+    try_name = make_log_name(log_name, os::get_temp_directory());
     jio_snprintf(warnbuf, sizeof(warnbuf),
                  "Warning:  Forcing option -XX:LogFile=%s\n", try_name);
     jio_print(warnbuf);
     delete file;
     file = new(ResourceObj::C_HEAP, mtInternal) fileStream(try_name);
-    FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
   }
+  FREE_C_HEAP_ARRAY(char, try_name, mtInternal);
+
   if (file->is_open()) {
     _log_file = file;
     xmlStream* xs = new(ResourceObj::C_HEAP, mtInternal) xmlStream(file);