Rename some things around incremental marking triggers

src/heap/incremental-marking.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/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 368 matching lines @@
   ActivateIncrementalWriteBarrier(heap_->new_space());
 
   LargePage* lop = heap_->lo_space()->first_page();
   while (lop->is_valid()) {
     SetOldSpacePageFlags(lop, true, is_compacting_);
     lop = lop->next_page();
   }
 }
 
 
-bool IncrementalMarking::ShouldActivate() {
-  return WorthActivating() &&
-         heap_->NextGCIsLikelyToBeFull(
+bool IncrementalMarking::ShouldActivateEvenWithoutIdleNotification() {
+  return CanBeActivated() &&
+         heap_->HeapIsFullEnoughToStartIncrementalMarking(
              heap_->old_generation_allocation_limit());
 }
 
 
 bool IncrementalMarking::WasActivated() { return was_activated_; }
 
 
-bool IncrementalMarking::WorthActivating() {
+bool IncrementalMarking::CanBeActivated() {
 #ifndef DEBUG
   static const intptr_t kActivationThreshold = 8 * MB;
 #else
   // TODO(gc) consider setting this to some low level so that some
   // debug tests run with incremental marking and some without.
   static const intptr_t kActivationThreshold = 0;
 #endif
   // Only start incremental marking in a safe state: 1) when incremental
   // marking is turned on, 2) when we are currently not in a GC, and
   // 3) when we are currently not serializing or deserializing the heap.
+  // Don't switch on for very small heaps.
   return FLAG_incremental_marking && FLAG_incremental_marking_steps &&
          heap_->gc_state() == Heap::NOT_IN_GC &&
          heap_->deserialization_complete() &&
          !heap_->isolate()->serializer_enabled() &&
          heap_->PromotedSpaceSizeOfObjects() > kActivationThreshold;
 }
 
 
 void IncrementalMarking::ActivateGeneratedStub(Code* stub) {
   DCHECK(RecordWriteStub::GetMode(stub) == RecordWriteStub::STORE_BUFFER_ONLY);
@@ skipping 387 matching lines @@
 
 
 void IncrementalMarking::Epilogue() {
   was_activated_ = false;
   weak_closure_was_overapproximated_ = false;
   weak_closure_approximation_rounds_ = 0;
 }
 
 
 void IncrementalMarking::OldSpaceStep(intptr_t allocated) {
-  if (IsStopped() && ShouldActivate()) {
+  if (IsStopped() && ShouldActivateEvenWithoutIdleNotification()) {
     Start();
   } else {
     Step(allocated * kOldSpaceAllocationMarkingFactor, GC_VIA_STACK_GUARD);
   }
 }
 
 
 void IncrementalMarking::SpeedUp() {
   bool speed_up = false;
 
@@ skipping 177 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }
 }  // namespace v8::internal