Move idle notification handling to GCIdleTimeHandler.

src/heap/gc-idle-time-handler.cc

 // Copyright 2014 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/heap/gc-idle-time-handler.h"
+#include "src/heap/gc-tracer.h"
+#include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
-
 const double GCIdleTimeHandler::kConservativeTimeRatio = 0.9;
+const size_t GCIdleTimeHandler::kMaxMarkCompactTimeInMs = 1000000;
 
 
 size_t GCIdleTimeHandler::EstimateMarkingStepSize(
     size_t idle_time_in_ms, size_t marking_speed_in_bytes_per_ms) {
   DCHECK(idle_time_in_ms > 0);
 
   if (marking_speed_in_bytes_per_ms == 0) {
-    marking_speed_in_bytes_per_ms =
-        GCIdleTimeHandler::kInitialConservativeMarkingSpeed;
+    marking_speed_in_bytes_per_ms = kInitialConservativeMarkingSpeed;
   }
 
   size_t marking_step_size = marking_speed_in_bytes_per_ms * idle_time_in_ms;
   if (marking_step_size / marking_speed_in_bytes_per_ms != idle_time_in_ms) {
     // In the case of an overflow we return maximum marking step size.
-    return GCIdleTimeHandler::kMaximumMarkingStepSize;
+    return kMaximumMarkingStepSize;
   }
 
   if (marking_step_size > kMaximumMarkingStepSize)
     return kMaximumMarkingStepSize;
 
   return static_cast<size_t>(marking_step_size *
                              GCIdleTimeHandler::kConservativeTimeRatio);
 }
+
+
+size_t GCIdleTimeHandler::EstimateMarkCompactTime(
+    size_t size_of_objects, size_t mark_compact_speed_in_bytes_per_ms) {
+  if (mark_compact_speed_in_bytes_per_ms == 0) {
+    mark_compact_speed_in_bytes_per_ms = kInitialConservativeMarkCompactSpeed;
+  }
+  size_t result = size_of_objects / mark_compact_speed_in_bytes_per_ms;
+  return Min(result, kMaxMarkCompactTimeInMs);
+}
+
+
+GCIdleTimeAction GCIdleTimeHandler::Compute(int idle_time_in_ms,
+                                            int contexts_disposed,
+                                            size_t size_of_objects,
+                                            bool incremental_marking_stopped,
+                                            GCTracer* gc_tracer) {
+  if (IsIdleRoundFinished()) {
+    if (EnoughGarbageSinceLastIdleRound() || contexts_disposed > 0) {
+      StartIdleRound();
+    } else {
+      return GCIdleTimeAction::Nothing();
+    }
+  }
+  if (incremental_marking_stopped) {
+    size_t speed =
+        static_cast<size_t>(gc_tracer->MarkCompactSpeedInBytesPerMillisecond());
+    if (idle_time_in_ms >=
+        static_cast<int>(EstimateMarkCompactTime(size_of_objects, speed))) {
+      // If there are no more than two GCs left in this idle round and we are
+      // allowed to do a full GC, then make those GCs full in order to compact
+      // the code space.
+      // TODO(ulan): Once we enable code compaction for incremental marking, we
+      // can get rid of this special case and always start incremental marking.
+      int remaining_mark_sweeps =
+          kMaxMarkCompactsInIdleRound - mark_compacts_since_idle_round_started_;
+      if (contexts_disposed > 0 || remaining_mark_sweeps <= 2) {
+        return GCIdleTimeAction::FullGC();
+      }
+    }
+  }
+  intptr_t speed = gc_tracer->IncrementalMarkingSpeedInBytesPerMillisecond();
+  size_t step_size =
+      static_cast<size_t>(EstimateMarkingStepSize(idle_time_in_ms, speed));
+  return GCIdleTimeAction::IncrementalMarking(step_size);
 }
 }
+}