--- a/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -574,16 +574,10 @@
 }
 
 void ParallelScavengeHeap::print_tracing_info() const {
-  if (TraceYoungGenTime) {
-    double time = PSScavenge::accumulated_time()->seconds();
-    tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time);
-  }
-  if (TraceOldGenTime) {
-    double time = UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds();
-    tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time);
-  }
-
   AdaptiveSizePolicyOutput::print();
+  log_debug(gc, heap, exit)("Accumulated young generation GC time %3.7f secs", PSScavenge::accumulated_time()->seconds());
+  log_debug(gc, heap, exit)("Accumulated old generation GC time %3.7f secs",
+      UseParallelOldGC ? PSParallelCompact::accumulated_time()->seconds() : PSMarkSweep::accumulated_time()->seconds());
 }
 
 

--- a/src/hotspot/share/gc/parallel/psMarkSweep.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/parallel/psMarkSweep.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -173,7 +173,9 @@
     TraceCollectorStats tcs(counters());
     TraceMemoryManagerStats tms(true /* Full GC */,gc_cause);
 
-    if (TraceOldGenTime) accumulated_time()->start();
+    if (log_is_enabled(Debug, gc, heap, exit)) {
+      accumulated_time()->start();
+    }
 
     // Let the size policy know we're starting
     size_policy->major_collection_begin();
@@ -342,7 +344,9 @@
     // We collected the heap, recalculate the metaspace capacity
     MetaspaceGC::compute_new_size();
 
-    if (TraceOldGenTime) accumulated_time()->stop();
+    if (log_is_enabled(Debug, gc, heap, exit)) {
+      accumulated_time()->stop();
+    }
 
     young_gen->print_used_change(young_gen_prev_used);
     old_gen->print_used_change(old_gen_prev_used);

--- a/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/parallel/psParallelCompact.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -1778,7 +1778,9 @@
     TraceCollectorStats tcs(counters());
     TraceMemoryManagerStats tms(true /* Full GC */,gc_cause);
 
-    if (TraceOldGenTime) accumulated_time()->start();
+    if (log_is_enabled(Debug, gc, heap, exit)) {
+      accumulated_time()->start();
+    }
 
     // Let the size policy know we're starting
     size_policy->major_collection_begin();
@@ -1897,7 +1899,7 @@
     // Resize the metaspace capacity after a collection
     MetaspaceGC::compute_new_size();
 
-    if (TraceOldGenTime) {
+    if (log_is_enabled(Debug, gc, heap, exit)) {
       accumulated_time()->stop();
     }
 

--- a/src/hotspot/share/gc/parallel/psScavenge.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/parallel/psScavenge.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -306,7 +306,9 @@
     TraceCollectorStats tcs(counters());
     TraceMemoryManagerStats tms(false /* not full GC */,gc_cause);
 
-    if (TraceYoungGenTime) accumulated_time()->start();
+    if (log_is_enabled(Debug, gc, heap, exit)) {
+      accumulated_time()->start();
+    }
 
     // Let the size policy know we're starting
     size_policy->minor_collection_begin();
@@ -607,7 +609,9 @@
       CardTableExtension::verify_all_young_refs_imprecise();
     }
 
-    if (TraceYoungGenTime) accumulated_time()->stop();
+    if (log_is_enabled(Debug, gc, heap, exit)) {
+      accumulated_time()->stop();
+    }
 
     young_gen->print_used_change(pre_gc_values.young_gen_used());
     old_gen->print_used_change(pre_gc_values.old_gen_used());

--- a/src/hotspot/share/gc/shared/genCollectedHeap.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/shared/genCollectedHeap.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -1157,11 +1157,10 @@
 }
 
 void GenCollectedHeap::print_tracing_info() const {
-  if (TraceYoungGenTime) {
-    _young_gen->print_summary_info();
-  }
-  if (TraceOldGenTime) {
-    _old_gen->print_summary_info();
+  if (log_is_enabled(Debug, gc, heap, exit)) {
+    LogStreamHandle(Debug, gc, heap, exit) lsh;
+    _young_gen->print_summary_info_on(&lsh);
+    _old_gen->print_summary_info_on(&lsh);
   }
 }
 

--- a/src/hotspot/share/gc/shared/generation.cpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/shared/generation.cpp	Thu Sep 21 14:32:05 2017 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -94,22 +94,14 @@
               p2i(_virtual_space.high_boundary()));
 }
 
-void Generation::print_summary_info() { print_summary_info_on(tty); }
-
 void Generation::print_summary_info_on(outputStream* st) {
   StatRecord* sr = stat_record();
   double time = sr->accumulated_time.seconds();
-  // I didn't want to change the logging when removing the level concept,
-  // but I guess this logging could say young/old or something instead of 0/1.
-  uint level;
-  if (GenCollectedHeap::heap()->is_young_gen(this)) {
-    level = 0;
-  } else {
-    level = 1;
-  }
-  st->print_cr("[Accumulated GC generation %d time %3.7f secs, "
-               "%u GC's, avg GC time %3.7f]",
-               level, time, sr->invocations,
+  st->print_cr("Accumulated %s generation GC time %3.7f secs, "
+               "%u GC's, avg GC time %3.7f",
+               GenCollectedHeap::heap()->is_young_gen(this) ? "young" : "old" ,
+               time,
+               sr->invocations,
                sr->invocations > 0 ? time / sr->invocations : 0.0);
 }
 

--- a/src/hotspot/share/gc/shared/generation.hpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/gc/shared/generation.hpp	Thu Sep 21 14:32:05 2017 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -549,7 +549,6 @@
 public:
   StatRecord* stat_record() { return &_stat_record; }
 
-  virtual void print_summary_info();
   virtual void print_summary_info_on(outputStream* st);
 
   // Performance Counter support

--- a/src/hotspot/share/runtime/globals.hpp	Tue Sep 26 19:31:06 2017 -0700
+++ b/src/hotspot/share/runtime/globals.hpp	Thu Sep 21 14:32:05 2017 +0200
@@ -2344,12 +2344,6 @@
           range(30*K, max_uintx/BytesPerWord)                               \
           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
                                                                             \
-  product(bool, TraceYoungGenTime, false,                                   \
-          "Trace accumulated time for young collection")                    \
-                                                                            \
-  product(bool, TraceOldGenTime, false,                                     \
-          "Trace accumulated time for old collection")                      \
-                                                                            \
   product(bool, PrintHeapAtSIGBREAK, true,                                  \
           "Print heap layout in response to SIGBREAK")                      \
                                                                             \