Make sure that idle scavenges are just performed when enough objects are allocated in new space.

test/unittests/heap/gc-idle-time-handler-unittest.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 <limits>
 
 #include "src/heap/gc-idle-time-handler.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
@@ skipping 201 matching lines @@
   heap_state.used_new_space_size = kNewSpaceCapacity;
   heap_state.scavenge_speed_in_bytes_per_ms = kNewSpaceCapacity;
   int idle_time_ms = 16;
   EXPECT_TRUE(GCIdleTimeHandler::ShouldDoScavenge(
       idle_time_ms, heap_state.new_space_capacity,
       heap_state.used_new_space_size, heap_state.scavenge_speed_in_bytes_per_ms,
       heap_state.new_space_allocation_throughput_in_bytes_per_ms));
 }
 
 
+TEST_F(GCIdleTimeHandlerTest, DoNotScavengeSmallNewSpaceSize) {
+  GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
+  heap_state.used_new_space_size = (MB / 2) - 1;
+  heap_state.scavenge_speed_in_bytes_per_ms = kNewSpaceCapacity;
+  int idle_time_ms = 16;
+  EXPECT_FALSE(GCIdleTimeHandler::ShouldDoScavenge(
+      idle_time_ms, heap_state.new_space_capacity,
+      heap_state.used_new_space_size, heap_state.scavenge_speed_in_bytes_per_ms,
+      heap_state.new_space_allocation_throughput_in_bytes_per_ms));
+}
+
+
 TEST_F(GCIdleTimeHandlerTest, ShouldDoMarkCompact) {
   size_t idle_time_ms = GCIdleTimeHandler::kMaxScheduledIdleTime;
   EXPECT_TRUE(GCIdleTimeHandler::ShouldDoMarkCompact(idle_time_ms, 0, 0));
 }
 
 
 TEST_F(GCIdleTimeHandlerTest, DontDoMarkCompact) {
   size_t idle_time_ms = 1;
   EXPECT_FALSE(GCIdleTimeHandler::ShouldDoMarkCompact(
       idle_time_ms, kSizeOfObjects, kMarkingSpeed));
@@ skipping 394 matching lines @@
     handler()->NotifyMarkCompact();
     handler()->NotifyIdleMarkCompact();
   }
   action = handler()->Compute(idle_time_ms, heap_state);
   EXPECT_EQ(DONE, action.type);
 }
 
 
 }  // namespace internal
 }  // namespace v8