Reduce initial boot-up memory use. This is an other attempt at what

src/spaces.h

 // 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 619 matching lines @@
                                  Address base,
                                  size_t size,
                                  Address area_start,
                                  Address area_end,
                                  Executability executable,
                                  Space* owner);
 
   friend class MemoryAllocator;
 };
 
+
 STATIC_CHECK(sizeof(MemoryChunk) <= MemoryChunk::kHeaderSize);
 
+
 // -----------------------------------------------------------------------------
 // A page is a memory chunk of a size 1MB. Large object pages may be larger.
 //
 // The only way to get a page pointer is by calling factory methods:
 //   Page* p = Page::FromAddress(addr); or
 //   Page* p = Page::FromAllocationTop(top);
 class Page : public MemoryChunk {
  public:
   // Returns the page containing a given address. The address ranges
   // from [page_addr .. page_addr + kPageSize[
@@ skipping 291 matching lines @@
 class MemoryAllocator {
  public:
   explicit MemoryAllocator(Isolate* isolate);
 
   // Initializes its internal bookkeeping structures.
   // Max capacity of the total space and executable memory limit.
   bool SetUp(intptr_t max_capacity, intptr_t capacity_executable);
 
   void TearDown();
 
-  Page* AllocatePage(PagedSpace* owner, Executability executable);
+  Page* AllocatePage(
+      intptr_t size, PagedSpace* owner, Executability executable);
 
   LargePage* AllocateLargePage(intptr_t object_size,
                                       Executability executable,

[Michael Starzinger, 2012/04/02 08:25:05]

I know you didn't touch that line, but something is wrong with indentation here.

                                       Space* owner);
 
   void Free(MemoryChunk* chunk);
 
   // Returns the maximum available bytes of heaps.
   intptr_t Available() { return capacity_ < size_ ? 0 : capacity_ - size_; }
 
   // Returns allocated spaces in bytes.
   intptr_t Size() { return size_; }
 
@@ skipping 651 matching lines @@
   inline int AreaSize() {
     return area_size_;
   }
 
  protected:
   int area_size_;
 
   // Maximum capacity of this space.
   intptr_t max_capacity_;
 
+  intptr_t SizeOfFirstPage();
+
   // Accounting information for this space.
   AllocationStats accounting_stats_;
 
   // The dummy page that anchors the double linked list of pages.
   Page anchor_;
 
   // The space's free list.
   FreeList free_list_;
 
   // Normal allocation information.
@@ skipping 998 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_