Ensure the memory reduces makes progress.

test/unittests/heap/memory-reducer-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/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);
+  return MemoryReducer::State(MemoryReducer::kDone, 0, 0.0, 1.0);
 }
 
 
 MemoryReducer::State WaitState(int started_gcs, double next_gc_start_ms) {
   return MemoryReducer::State(MemoryReducer::kWait, started_gcs,
-                              next_gc_start_ms);
+                              next_gc_start_ms, 1.0);
 }
 
 
 MemoryReducer::State RunState(int started_gcs, double next_gc_start_ms) {
   return MemoryReducer::State(MemoryReducer::kRun, started_gcs,
-                              next_gc_start_ms);
+                              next_gc_start_ms, 1.0);
 }
 
 
 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;
@@ skipping 69 matching lines @@
   state1 = MemoryReducer::Step(state0, BackgroundIdleNotificationEvent(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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
-  EXPECT_EQ(MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs + 2, state1.next_gc_start_ms);
   EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(2, state1.last_gc_time_ms);
 
-  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(0));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
-  EXPECT_EQ(MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs + 2, state1.next_gc_start_ms);
   EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(2, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 }
 
 
 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);
@@ skipping 13 matching lines @@
 
   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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 
   state1 = MemoryReducer::Step(state0, BackgroundIdleNotificationEvent(2000));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
   EXPECT_EQ(2000 + MemoryReducer::kLongDelayMs, state1.next_gc_start_ms);
   EXPECT_EQ(state0.started_gcs + 1, state1.started_gcs);
 
   state1 =
       MemoryReducer::Step(state0, BackgroundIdleNotificationEvent(2000, false));
   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);
 
+  state0.last_gc_time_ms = 0;
+  state1 = MemoryReducer::Step(
+      state0,
+      TimerEventHighAllocationRate(MemoryReducer::kWatchdogDelayMs + 1));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(MemoryReducer::kWatchdogDelayMs + 1 + MemoryReducer::kLongDelayMs,
+            state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs, state1.started_gcs);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
+
+  state0.last_gc_time_ms = 1;
+  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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
+
   state0.started_gcs = MemoryReducer::kMaxNumberOfGCs;
   state1 = MemoryReducer::Step(state0, BackgroundIdleNotificationEvent(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);
 }
 
 
 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);
+
+  state1 = MemoryReducer::Step(
+      state0,
+      TimerEventHighAllocationRate(MemoryReducer::kWatchdogDelayMs + 2));
+  EXPECT_EQ(MemoryReducer::kRun, state1.action);
+  EXPECT_EQ(0, state1.next_gc_start_ms);
+  EXPECT_EQ(state0.started_gcs + 1, state1.started_gcs);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 }
 
 
 TEST(MemoryReducer, FromWaitToDone) {
   if (!FLAG_incremental_marking) return;
 
   MemoryReducer::State state0(WaitState(2, 0.0)), state1(DoneState());
 
   state0.started_gcs = MemoryReducer::kMaxNumberOfGCs;
 
   state1 = MemoryReducer::Step(state0, TimerEventLowAllocationRate(2000));
   EXPECT_EQ(MemoryReducer::kDone, state1.action);
   EXPECT_EQ(0, state1.next_gc_start_ms);
   EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 
   state1 = MemoryReducer::Step(state0, TimerEventHighAllocationRate(2000));
   EXPECT_EQ(MemoryReducer::kDone, state1.action);
   EXPECT_EQ(0, state1.next_gc_start_ms);
   EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 
   state1 = MemoryReducer::Step(state0, TimerEventPendingGC(2000));
   EXPECT_EQ(MemoryReducer::kDone, state1.action);
   EXPECT_EQ(0, state1.next_gc_start_ms);
   EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 }
 
 
 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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(state0.last_gc_time_ms, state1.last_gc_time_ms);
 }
 
 
 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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 }
 
 
 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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 
   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);
+  EXPECT_EQ(2000, state1.last_gc_time_ms);
 }
 
 }  // namespace internal
 }  // namespace v8