Added --trace_idle_notification_verbose which prints out the idle notificatino heap state.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/732473002

Cr-Commit-Position: refs/heads/master@{#25369}

src/flag-definitions.h

@@ -542,6 +542,8 @@ DEFINE_BOOL(trace_gc_ignore_scavenger, false,
             "do not print trace line after scavenger collection")
 DEFINE_BOOL(trace_idle_notification, false,
             "print one trace line following each idle notification")
+DEFINE_BOOL(trace_idle_notification_verbose, false,
+            "prints the heap state used by the idle notification")
 DEFINE_BOOL(print_cumulative_gc_stat, false,
             "print cumulative GC statistics in name=value format on exit")
 DEFINE_BOOL(print_max_heap_committed, false,

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

@@ -41,6 +41,25 @@ void GCIdleTimeAction::Print() {
 }
 
 
+void GCIdleTimeHandler::HeapState::Print() {
+  PrintF("contexts_disposed=%d ", contexts_disposed);
+  PrintF("contexts_disposal_rate=%f ", contexts_disposal_rate);
+  PrintF("size_of_objects=%" V8_PTR_PREFIX "d ", size_of_objects);
+  PrintF("incremental_marking_stopped=%d ", incremental_marking_stopped);
+  PrintF("can_start_incremental_marking=%d ", can_start_incremental_marking);
+  PrintF("sweeping_in_progress=%d ", sweeping_in_progress);
+  PrintF("mark_compact_speed=%" V8_PTR_PREFIX "d ",
+         mark_compact_speed_in_bytes_per_ms);
+  PrintF("incremental_marking_speed=%" V8_PTR_PREFIX "d ",
+         incremental_marking_speed_in_bytes_per_ms);
+  PrintF("scavenge_speed=%" V8_PTR_PREFIX "d ", scavenge_speed_in_bytes_per_ms);
+  PrintF("new_space_size=%" V8_PTR_PREFIX "d ", used_new_space_size);
+  PrintF("new_space_capacity=%" V8_PTR_PREFIX "d ", new_space_capacity);
+  PrintF("new_space_allocation_throughput=%" V8_PTR_PREFIX "d",
+         new_space_allocation_throughput_in_bytes_per_ms);
+}
+
+
 size_t GCIdleTimeHandler::EstimateMarkingStepSize(
     size_t idle_time_in_ms, size_t marking_speed_in_bytes_per_ms) {
   DCHECK(idle_time_in_ms > 0);

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

@@ -116,7 +116,10 @@ class GCIdleTimeHandler {
   // If contexts are disposed at a higher rate a full gc is triggered.
   static const double kHighContextDisposalRate;
 
-  struct HeapState {
+  class HeapState {
+   public:
+    void Print();
+
     int contexts_disposed;
     double contexts_disposal_rate;
     size_t size_of_objects;

src/heap/heap.cc

@@ -4485,7 +4485,13 @@ bool Heap::IdleNotification(int idle_time_in_ms) {
     PrintF("Idle notification: requested idle time %d ms, actual time %d ms [",
            idle_time_in_ms, actual_time_in_ms);
     action.Print();
-    PrintF("]\n");
+    PrintF("]");
+    if (FLAG_trace_idle_notification_verbose) {
+      PrintF("[");
+      heap_state.Print();
+      PrintF("]");
+    }
+    PrintF("\n");
   }
 
   contexts_disposed_ = 0;