Cleanup allocation site pretenuring tracing, added new flag --trace-pretenuring-statistics.

src/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 530 matching lines @@
         i++;
       } else {
         list_element = site->weak_next();
       }
     }
 
     if (trigger_deoptimization) isolate_->stack_guard()->DeoptMarkedCode();
 
     allocation_sites_scratchpad_length = 0;
 
-    // TODO(mvstanton): Pretenure decisions are only made once for an allocation
-    // site. Find a sane way to decide about revisiting the decision later.
-
-    if (FLAG_trace_track_allocation_sites &&
+    if (FLAG_trace_pretenuring_statistics &&
         (allocation_mementos_found > 0 ||
          tenure_decisions > 0 ||
          dont_tenure_decisions > 0)) {
       PrintF("GC: (mode, #visited allocation sites, #active allocation sites, "
              "#mementos, #tenure decisions, #donttenure decisions) "
              "(%s, %d, %d, %d, %d, %d)\n",
              use_scratchpad ? "use scratchpad" : "use list",
              allocation_sites,
              active_allocation_sites,
              allocation_mementos_found,
@@ skipping 7100 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   OS::MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal