Track JS allocations as they arrive with no affection on performance when tracking is switched off

src/mark-compact.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 2724 matching lines @@
 // The second pass updates pointers to new space in all spaces.  It is possible
 // to encounter pointers to dead new space objects during traversal of pointers
 // to new space.  We should clear them to avoid encountering them during next
 // pointer iteration.  This is an issue if the store buffer overflows and we
 // have to scan the entire old space, including dead objects, looking for
 // pointers to new space.
 void MarkCompactCollector::MigrateObject(Address dst,
                                          Address src,
                                          int size,
                                          AllocationSpace dest) {
-  HEAP_PROFILE(heap(), ObjectMoveEvent(src, dst));
+  HEAP_PROFILE(heap(), ObjectMoveEvent(src, dst, size));
   // TODO(hpayer): Replace these checks with asserts.
   CHECK(heap()->AllowedToBeMigrated(HeapObject::FromAddress(src), dest));
   CHECK(dest != LO_SPACE && size <= Page::kMaxNonCodeHeapObjectSize);
   if (dest == OLD_POINTER_SPACE) {
     Address src_slot = src;
     Address dst_slot = dst;
     ASSERT(IsAligned(size, kPointerSize));
 
     for (int remaining = size / kPointerSize; remaining > 0; remaining--) {
       Object* value = Memory::Object_at(src_slot);
@@ skipping 163 matching lines @@
 bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
                                             int object_size) {
   // TODO(hpayer): Replace that check with an assert.
   CHECK(object_size <= Page::kMaxNonCodeHeapObjectSize);
 
   OldSpace* target_space = heap()->TargetSpace(object);
 
   ASSERT(target_space == heap()->old_pointer_space() ||
          target_space == heap()->old_data_space());
   Object* result;
-  MaybeObject* maybe_result = target_space->AllocateRaw(object_size);
+  MaybeObject* maybe_result = target_space->AllocateRawForMigration(object_size);

[loislo, 2013/08/27 09:04:57]

style: 80 symbols

[Alexandra Mikhaylova, 2013/09/19 16:03:38]

Done.

   if (maybe_result->ToObject(&result)) {
     HeapObject* target = HeapObject::cast(result);
     MigrateObject(target->address(),
                   object->address(),
                   object_size,
                   target_space->identity());
     heap()->mark_compact_collector()->tracer()->
         increment_promoted_objects_size(object_size);
     return true;
   }
@@ skipping 52 matching lines @@
     if (*cell == 0) continue;
 
     int live_objects = MarkWordToObjectStarts(*cell, offsets);
     for (int i = 0; i < live_objects; i++) {
       Address object_addr = cell_base + offsets[i] * kPointerSize;
       HeapObject* object = HeapObject::FromAddress(object_addr);
       ASSERT(Marking::IsBlack(Marking::MarkBitFrom(object)));
 
       int size = object->Size();
 
-      MaybeObject* target = space->AllocateRaw(size);
+      MaybeObject* target = space->AllocateRawForMigration(size);
       if (target->IsFailure()) {
         // OS refused to give us memory.
         V8::FatalProcessOutOfMemory("Evacuation");
         return;
       }
 
       Object* target_object = target->ToObjectUnchecked();
 
       MigrateObject(HeapObject::cast(target_object)->address(),
                     object_addr,
@@ skipping 1320 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal