Trace idle notification.

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;
 const size_t GCIdleTimeHandler::kMinTimeForFinalizeSweeping = 100;
 const int GCIdleTimeHandler::kMaxMarkCompactsInIdleRound = 7;
 const int GCIdleTimeHandler::kIdleScavengeThreshold = 5;
 
 
+void GCIdleTimeAction::Print() {
+  switch (type) {
+    case DO_NOTHING:
+      PrintF("no action");
+      break;
+    case DO_INCREMENTAL_MARKING:
+      PrintF("incremental marking with step %" V8_PTR_PREFIX "d", parameter);
+      break;
+    case DO_SCAVENGE:
+      PrintF("scavenge");
+      break;
+    case DO_FULL_GC:
+      PrintF("full GC");
+      break;
+    case DO_FINALIZE_SWEEPING:
+      PrintF("finalize sweeping");
+      break;
+  }
+}
+
+
 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 = 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) {
@@ skipping 52 matching lines @@
       idle_time_in_ms >= kMinTimeForFinalizeSweeping) {
     return GCIdleTimeAction::FinalizeSweeping();
   }
 
   size_t step_size = EstimateMarkingStepSize(
       idle_time_in_ms, heap_state.incremental_marking_speed_in_bytes_per_ms);
   return GCIdleTimeAction::IncrementalMarking(step_size);
 }
 }
 }