Slow down incremental marking on main thread when idle notification is active.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 102 matching lines @@
       nodes_died_in_new_space_(0),
       nodes_copied_in_new_space_(0),
       nodes_promoted_(0),
       maximum_size_scavenges_(0),
       max_gc_pause_(0.0),
       total_gc_time_ms_(0.0),
       max_alive_after_gc_(0),
       min_in_mutator_(kMaxInt),
       marking_time_(0.0),
       sweeping_time_(0.0),
+      last_idle_notification_time_(0.0),
       mark_compact_collector_(this),
       store_buffer_(this),
       marking_(this),
       incremental_marking_(this),
       gc_count_at_last_idle_gc_(0),
       full_codegen_bytes_generated_(0),
       crankshaft_codegen_bytes_generated_(0),
       gcs_since_last_deopt_(0),
 #ifdef VERIFY_HEAP
       no_weak_object_verification_scope_depth_(0),
@@ skipping 4390 matching lines @@
       CollectGarbage(NEW_SPACE, "idle notification: scavenge");
       break;
     case DO_FINALIZE_SWEEPING:
       mark_compact_collector()->EnsureSweepingCompleted();
       break;
     case DO_NOTHING:
       break;
   }
 
   double current_time = MonotonicallyIncreasingTimeInMs();
+  last_idle_notification_time_ = current_time;
   double deadline_difference = deadline_in_ms - current_time;
 
   if (deadline_difference >= 0) {
     if (action.type != DONE && action.type != DO_NOTHING) {
       isolate()->counters()->gc_idle_time_limit_undershot()->AddSample(
           static_cast<int>(deadline_difference));
     }
   } else {
     isolate()->counters()->gc_idle_time_limit_overshot()->AddSample(
         static_cast<int>(-deadline_difference));
@@ skipping 14 matching lines @@
       PrintF("]");
     }
     PrintF("\n");
   }
 
   contexts_disposed_ = 0;
   return result;
 }
 
 
+bool Heap::RecentIdleNotifcationHappened() {
+  return (last_idle_notification_time_ +
+          GCIdleTimeHandler::kMaxFrameRenderingIdleTime) >
+         MonotonicallyIncreasingTimeInMs();
+}
+
+
 #ifdef DEBUG
 
 void Heap::Print() {
   if (!HasBeenSetUp()) return;
   isolate()->PrintStack(stdout);
   AllSpaces spaces(this);
   for (Space* space = spaces.next(); space != NULL; space = spaces.next()) {
     space->Print();
   }
 }
@@ skipping 1799 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal