Reduce memory use immediately after boot.

test/cctest/test-spaces.cc

 // Copyright 2011 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 122 matching lines @@
 
   MemoryAllocator* memory_allocator = new MemoryAllocator(isolate);
   CHECK(memory_allocator->SetUp(heap->MaxReserved(),
                                 heap->MaxExecutableSize()));
 
   int total_pages = 0;
   OldSpace faked_space(heap,
                        heap->MaxReserved(),
                        OLD_POINTER_SPACE,
                        NOT_EXECUTABLE);
-  Page* first_page =
-      memory_allocator->AllocatePage(&faked_space, NOT_EXECUTABLE);
+  Page* first_page = memory_allocator->AllocatePage(
+      Page::kObjectAreaSize, &faked_space, NOT_EXECUTABLE);
 
   first_page->InsertAfter(faked_space.anchor()->prev_page());
   CHECK(first_page->is_valid());
   CHECK(first_page->next_page() == faked_space.anchor());
   total_pages++;
 
   for (Page* p = first_page; p != faked_space.anchor(); p = p->next_page()) {
     CHECK(p->owner() == &faked_space);
   }
 
   // Again, we should get n or n - 1 pages.
   Page* other =
-      memory_allocator->AllocatePage(&faked_space, NOT_EXECUTABLE);
+      memory_allocator->AllocatePage(
+          Page::kObjectAreaSize, &faked_space, NOT_EXECUTABLE);
   CHECK(other->is_valid());
   total_pages++;
   other->InsertAfter(first_page);
   int page_count = 0;
   for (Page* p = first_page; p != faked_space.anchor(); p = p->next_page()) {
     CHECK(p->owner() == &faked_space);
     page_count++;
   }
   CHECK(total_pages == page_count);
 
@@ skipping 89 matching lines @@
     { MaybeObject* maybe_obj = lo->AllocateRaw(lo_size, NOT_EXECUTABLE);
       if (!maybe_obj->ToObject(&obj)) break;
     }
     CHECK(lo->Available() < available);
   };
 
   CHECK(!lo->IsEmpty());
 
   CHECK(lo->AllocateRaw(lo_size, NOT_EXECUTABLE)->IsFailure());
 }