Start incremental marking only if there are enough promoted objects since the last GC.

src/heap.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 99 matching lines @@
       allocation_allowed_(true),
       allocation_timeout_(0),
       disallow_allocation_failure_(false),
       debug_utils_(NULL),
 #endif  // DEBUG
       new_space_high_promotion_mode_active_(false),
       old_gen_promotion_limit_(kMinimumPromotionLimit),
       old_gen_allocation_limit_(kMinimumAllocationLimit),
       old_gen_limit_factor_(1),
       size_of_old_gen_at_last_old_space_gc_(0),
+      total_promoted_at_last_old_space_gc_(0),
       external_allocation_limit_(0),
       amount_of_external_allocated_memory_(0),
       amount_of_external_allocated_memory_at_last_global_gc_(0),
       old_gen_exhausted_(false),
       store_buffer_rebuilder_(store_buffer()),
       hidden_symbol_(NULL),
       global_gc_prologue_callback_(NULL),
       global_gc_epilogue_callback_(NULL),
       gc_safe_size_of_old_object_(NULL),
       total_regexp_code_generated_(0),
@@ skipping 659 matching lines @@
   if (collector == MARK_COMPACTOR) {
     // Perform mark-sweep with optional compaction.
     MarkCompact(tracer);
     sweep_generation_++;
     bool high_survival_rate_during_scavenges = IsHighSurvivalRate() &&
         IsStableOrIncreasingSurvivalTrend();
 
     UpdateSurvivalRateTrend(start_new_space_size);
 
     size_of_old_gen_at_last_old_space_gc_ = PromotedSpaceSize();
+    total_promoted_at_last_old_space_gc_ = PromotedTotalSizeOfObjects();
 
     if (high_survival_rate_during_scavenges &&
         IsStableOrIncreasingSurvivalTrend()) {
       // Stable high survival rates of young objects both during partial and
       // full collection indicate that mutator is either building or modifying
       // a structure with a long lifetime.
       // In this case we aggressively raise old generation memory limits to
       // postpone subsequent mark-sweep collection and thus trade memory
       // space for the mutation speed.
       old_gen_limit_factor_ = 2;
@@ skipping 6158 matching lines @@
   } else {
     p ^= 0x1d1ed & (Page::kPageSize - 1);  // I died.
   }
   remembered_unmapped_pages_[remembered_unmapped_pages_index_] =
       reinterpret_cast<Address>(p);
   remembered_unmapped_pages_index_++;
   remembered_unmapped_pages_index_ %= kRememberedUnmappedPages;
 }
 
 } }  // namespace v8::internal