Check the growth of the old generation before expanding the paged...

src/heap.h

 // Copyright 2006-2008 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 726 matching lines @@
         amount_of_external_allocated_memory_ = amount;
       }
     }
     ASSERT(amount_of_external_allocated_memory_ >= 0);
     return amount_of_external_allocated_memory_;
   }
 
   // Allocate unitialized fixed array (pretenure == NON_TENURE).
   static Object* AllocateRawFixedArray(int length);
 
+  // True if we have reached the allocation limit in the old generation that
+  // should force the next GC (caused normally) to be a full one.
+  static bool OldGenerationPromotionLimitReached() {
+    return (PromotedSpaceSize() + PromotedExternalMemorySize())
+           > old_gen_promotion_limit_;
+  }
+
+  // True if we have reached the allocation limit in the old generation that
+  // should artificially cause a GC right now.
+  static bool OldGenerationAllocationLimitReached() {
+    return (PromotedSpaceSize() + PromotedExternalMemorySize())
+           > old_gen_allocation_limit_;
+  }
+
  private:
   static int semispace_size_;
   static int initial_semispace_size_;
   static int young_generation_size_;
   static int old_generation_size_;
 
   static int new_space_growth_limit_;
   static int scavenge_count_;
 
   static const int kMaxMapSpaceSize = 8*MB;
@@ skipping 21 matching lines @@
   // If the --gc-interval flag is set to a positive value, this
   // variable holds the value indicating the number of allocations
   // remain until the next failure and garbage collection.
   static int allocation_timeout_;
 
   // Do we expect to be able to handle allocation failure at this
   // time?
   static bool disallow_allocation_failure_;
 #endif  // DEBUG
 
-  // Promotion limit that trigger a global GC
-  static int promoted_space_limit_;
+  // Limit that triggers a global GC on the next (normally caused) GC.  This
+  // is checked when we have already decided to do a GC to help determine
+  // which collector to invoke.
+  static int old_gen_promotion_limit_;
+
+  // Limit that triggers a global GC as soon as is reasonable.  This is
+  // checked before expanding a paged space in the old generation and on
+  // every allocation in large object space.
+  static int old_gen_allocation_limit_;
 
   // The amount of external memory registered through the API kept alive
   // by global handles
   static int amount_of_external_allocated_memory_;
 
   // Caches the amount of external memory registered at the last global gc.
   static int amount_of_external_allocated_memory_at_last_global_gc_;
 
   // Indicates that an allocation has failed in the old generation since the
   // last GC.
@@ skipping 398 matching lines @@
   int marked_count_;
 
   // The count from the end of the previous full GC.  Will be zero if there
   // was no previous full GC.
   int previous_marked_count_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_