Logger does not need to invoke the garbage collector to iterate the heap.

src/log.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/log.h"
 
 #include <cstdarg>
 #include <memory>
 #include <sstream>
 
@@ skipping 1528 matching lines @@
       break;
     case AbstractCode::NUMBER_OF_KINDS:
       UNIMPLEMENTED();
   }
   PROFILE(isolate_, CodeCreateEvent(tag, code_object, description));
 }
 
 
 void Logger::LogCodeObjects() {
   Heap* heap = isolate_->heap();
-  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "Logger::LogCodeObjects");
   HeapIterator iterator(heap);
   DisallowHeapAllocation no_gc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (obj->IsCode()) LogCodeObject(obj);
     if (obj->IsBytecodeArray()) LogCodeObject(obj);
   }
 }
 
 void Logger::LogBytecodeHandlers() {
   if (!FLAG_ignition) return;
@@ skipping 66 matching lines @@
     }
   } else {
     PROFILE(isolate_, CodeCreateEvent(CodeEventListener::LAZY_COMPILE_TAG,
                                       *code, *shared, *func_name));
   }
 }
 
 
 void Logger::LogCompiledFunctions() {
   Heap* heap = isolate_->heap();
-  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "Logger::LogCompiledFunctions");
   HandleScope scope(isolate_);
   const int compiled_funcs_count = EnumerateCompiledFunctions(heap, NULL, NULL);
   ScopedVector< Handle<SharedFunctionInfo> > sfis(compiled_funcs_count);
   ScopedVector<Handle<AbstractCode> > code_objects(compiled_funcs_count);
   EnumerateCompiledFunctions(heap, sfis.start(), code_objects.start());
 
   // During iteration, there can be heap allocation due to
   // GetScriptLineNumber call.
   for (int i = 0; i < compiled_funcs_count; ++i) {
     if (code_objects[i].is_identical_to(isolate_->builtins()->CompileLazy()))
       continue;
     LogExistingFunction(sfis[i], code_objects[i]);
   }
 }
 
 
 void Logger::LogAccessorCallbacks() {
   Heap* heap = isolate_->heap();
-  heap->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "Logger::LogAccessorCallbacks");
   HeapIterator iterator(heap);
   DisallowHeapAllocation no_gc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (!obj->IsAccessorInfo()) continue;
     AccessorInfo* ai = AccessorInfo::cast(obj);
     if (!ai->name()->IsName()) continue;
     Address getter_entry = v8::ToCData<Address>(ai->getter());
     Name* name = Name::cast(ai->name());
     if (getter_entry != 0) {
 #if USES_FUNCTION_DESCRIPTORS
@@ skipping 187 matching lines @@
 
   if (profiler_listener_.get() != nullptr) {
     removeCodeEventListener(profiler_listener_.get());
   }
 
   return log_->Close();
 }
 
 }  // namespace internal
 }  // namespace v8