Uncommit and shrink semi-spaces only on low allocation rate.

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 {
@@ skipping 40 matching lines @@
   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",
+  PrintF("new_space_allocation_throughput=%" V8_PTR_PREFIX "d ",
          new_space_allocation_throughput_in_bytes_per_ms);
+  PrintF("current_new_space_allocation_throughput=%" V8_PTR_PREFIX "d",
+         current_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);
 
   if (marking_speed_in_bytes_per_ms == 0) {
     marking_speed_in_bytes_per_ms = kInitialConservativeMarkingSpeed;
   }
@@ skipping 332 matching lines @@
       }
       if (mutator_gcs > idle_mark_compacts_) {
         return kReduceLatency;
       }
       break;
   }
   return mode_;
 }
 }
 }