Improve the reporting of scavenger and free list reports.

runtime/vm/scavenger.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/scavenger.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 
@@ skipping 637 matching lines @@
   IterateWeakReferences(isolate, &visitor);
   ScavengerWeakVisitor weak_visitor(this);
   IterateWeakRoots(isolate, &weak_visitor, invoke_api_callbacks);
   visitor.Finalize();
   ProcessPeerReferents();
   Epilogue(isolate, invoke_api_callbacks);
   timer.Stop();
 
   if (FLAG_verbose_gc) {
     const intptr_t KB2 = KB / 2;
+    double survival = ((in_use() + visitor.bytes_promoted()) /
+                       static_cast<double>(in_use_before)) * 100.0;
+    double promoted = (visitor.bytes_promoted() /
+                       static_cast<double>(in_use() + visitor.bytes_promoted()))
+                      * 100.0;
     OS::PrintErr("Scavenge[%d]: %"Pd64"us (%"Pd"K -> %"Pd"K, %"Pd"K)\n"
-                 "Promoted %"Pd"K\n",
+                 "Surviving %"Pd"K %.1f%%\n"
+                 "Promoted survivors %"Pd"K %.1f%%\n",
                  count_,
                  timer.TotalElapsedTime(),
                  (in_use_before + KB2) / KB,
                  (in_use() + KB2) / KB,
                  (capacity() + KB2) / KB,
-                 (visitor.bytes_promoted() + KB2) / KB);
+                 (in_use() + visitor.bytes_promoted() + KB2) / KB,
+                 survival,
+                 (visitor.bytes_promoted() + KB2) / KB,
+                 promoted);
   }
 
   if (FLAG_verify_after_gc) {
     OS::PrintErr("Verifying after Scavenge...");
     heap_->Verify();
     OS::PrintErr(" done.\n");
   }
 
   count_++;
   // Done scavenging. Reset the marker.
@@ skipping 21 matching lines @@
   PeerTable::iterator it = peer_table_.find(raw_obj);
   return (it == peer_table_.end()) ? NULL : it->second;
 }
 
 
 int64_t Scavenger::PeerCount() const {
   return static_cast<int64_t>(peer_table_.size());
 }
 
 }  // namespace dart