Replace reduce-memory mode in idle notification with delayed clean-up GC.

test/unittests/heap/memory-reducer-unittest.cc

Index: test/unittests/heap/memory-reducer-unittest.cc
diff --git a/test/unittests/heap/memory-reducer-unittest.cc b/test/unittests/heap/memory-reducer-unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7f6785d5093ea8e85a6d8f48f3c45de40653e756
--- /dev/null
+++ b/test/unittests/heap/memory-reducer-unittest.cc
@@ -0,0 +1,237 @@
+// 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/flags.h"
+#include "src/heap/memory-reducer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace internal {
+
+MemoryReducer::State DoneState() {
+  return MemoryReducer::State(MemoryReducer::kDone, 0, 0.0);
+}
+
+
+MemoryReducer::State WaitState(int started_gcs, double next_gc_start_ms) {
+  return MemoryReducer::State(MemoryReducer::kWait, started_gcs,
+                              next_gc_start_ms);
+}
+
+
+MemoryReducer::State RunState(int started_gcs, double next_gc_start_ms) {
+  return MemoryReducer::State(MemoryReducer::kRun, started_gcs,
+                              next_gc_start_ms);
+}
+
+
+MemoryReducer::Event MarkCompactEvent(double time_ms,
+                                      bool next_gc_likely_to_collect_more) {
+  MemoryReducer::Event event;
+  event.type = MemoryReducer::kMarkCompact;
+  event.time_ms = time_ms;
+  event.next_gc_likely_to_collect_more = next_gc_likely_to_collect_more;
+  return event;
+}
+
+
+MemoryReducer::Event MarkCompactEventGarbageLeft(double time_ms) {
+  return MarkCompactEvent(time_ms, true);
+}
+
+
+MemoryReducer::Event MarkCompactEventNoGarbageLeft(double time_ms) {
+  return MarkCompactEvent(time_ms, false);
+}
+
+
+MemoryReducer::Event TimerEvent(double time_ms, bool low_allocation_rate,
+                                bool can_start_incremental_gc) {
+  MemoryReducer::Event event;
+  event.type = MemoryReducer::kTimer;
+  event.time_ms = time_ms;
+  event.low_allocation_rate = low_allocation_rate;
+  event.can_start_incremental_gc = can_start_incremental_gc;
+  return event;
+}
+
+
+MemoryReducer::Event TimerEventLowAllocationRate(double time_ms) {
+  return TimerEvent(time_ms, true, true);
+}
+
+
+MemoryReducer::Event TimerEventHighAllocationRate(double time_ms) {
+  return TimerEvent(time_ms, false, true);
+}
+
+
+MemoryReducer::Event TimerEventPendingGC(double time_ms) {
+  return TimerEvent(time_ms, true, false);
+}
+
+
+MemoryReducer::Event ContextDisposedEvent(double time_ms) {
+  MemoryReducer::Event event;
+  event.type = MemoryReducer::kContextDisposed;
+  event.time_ms = time_ms;
+  return event;
+}
+
+
+TEST(MemoryReducer, FromDoneToDone) {
+  MemoryReducer::State state0(DoneState()), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, TimerEventLowAllocationRate(0));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+
+  state1 = MemoryReducer::Step(state0, TimerEventHighAllocationRate(0));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+
+  state1 = MemoryReducer::Step(state0, TimerEventPendingGC(0));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+}
+
+
+TEST(MemoryReducer, FromDoneToWait) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(DoneState()), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(0));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(0));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, ContextDisposedEvent(0));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+}
+
+
+TEST(MemoryReducer, FromWaitToWait) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(WaitState(2, 1000.0)), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, ContextDisposedEvent(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(
+      state0, TimerEventLowAllocationRate(state0.next_gc_start_ms - 1));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, TimerEventHighAllocationRate(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, TimerEventPendingGC(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+}
+
+
+TEST(MemoryReducer, FromWaitToRun) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(WaitState(0, 1000.0)), state1(DoneState());
+
+  state1 = MemoryReducer::Step(
+      state0, TimerEventLowAllocationRate(state0.next_gc_start_ms + 1));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(0, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs + 1, state1.started_gcs);
+}
+
+
+TEST(MemoryReducer, FromRunToRun) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(RunState(1, 0.0)), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, TimerEventLowAllocationRate(2000));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, TimerEventHighAllocationRate(2000));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, TimerEventPendingGC(2000));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state1 = MemoryReducer::Step(state0, ContextDisposedEvent(2000));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(state0.next_gc_start_ms, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+}
+
+
+TEST(MemoryReducer, FromRunToDone) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(RunState(2, 0.0)), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+  EXPECT_EQ(0, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+
+  state0.started_gcs = MemoryReducer::kMaxNumberOfGCs;
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+  EXPECT_EQ(0, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+}
+
+
+TEST(MemoryReducer, FromRunToWait) {
+  if (!FLAG_incremental_marking) return;
+
+  MemoryReducer::State state0(RunState(2, 0.0)), state1(DoneState());
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kShortDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+
+  state0.started_gcs = 1;
+
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(2000 + MemoryReducer::kShortDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+}
+
+}  // namespace internal
+}  // namespace v8