Revert 8133: Lower heap size limits on systems that are short of virtual memory.

src/heap.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 135 matching lines @@
       last_idle_notification_gc_count_init_(false),
       configured_(false),
       is_safe_to_read_maps_(true) {
   // Allow build-time customization of the max semispace size. Building
   // V8 with snapshots and a non-default max semispace size is much
   // easier if you can define it as part of the build environment.
 #if defined(V8_MAX_SEMISPACE_SIZE)
   max_semispace_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE;
 #endif
 
-  intptr_t max_virtual = OS::MaxVirtualMemory();
-
-  if (max_virtual > 0) {
-    intptr_t half = max_virtual >> 1;
-    intptr_t quarter = max_virtual >> 2;
-    // If we have limits on the amount of virtual memory we can use then we may
-    // be forced to lower the allocation limits.  We reserve one quarter of the
-    // memory for young space and off-heap data.  The rest is distributed as
-    // described below.
-    if (code_range_size_ > 0) {
-      // Reserve a quarter of the memory for the code range.  The old space
-      // heap gets the remaining half.  There is some unavoidable double
-      // counting going on here since the heap size is measured in committed
-      // virtual memory and the code range is only reserved virtual memory.
-      code_range_size_ = Min(code_range_size_, quarter);
-      max_old_generation_size_ = Min(max_old_generation_size_, half);
-    } else {
-      // Reserve three quarters of the memory for the old space heap including
-      // the executable code.
-      max_old_generation_size_ = Min(max_old_generation_size_, half + quarter);
-    }
-  }
-
   memset(roots_, 0, sizeof(roots_[0]) * kRootListLength);
   global_contexts_list_ = NULL;
   mark_compact_collector_.heap_ = this;
   external_string_table_.heap_ = this;
 }
 
 
 intptr_t Heap::Capacity() {
   if (!HasBeenSetup()) return 0;
 
@@ skipping 5761 matching lines @@
 }
 
 
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 } }  // namespace v8::internal