[heap] Add a guard for restarting the memory reducer after mark-compact.

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, 1.0);
+  return MemoryReducer::State(MemoryReducer::kDone, 0, 0.0, 1.0, 0);
 }
 
+MemoryReducer::State DoneState(size_t committed_memory) {
+  return MemoryReducer::State(MemoryReducer::kDone, 0, 0.0, 1.0,
+                              committed_memory);
+}
 
 MemoryReducer::State WaitState(int started_gcs, double next_gc_start_ms) {
   return MemoryReducer::State(MemoryReducer::kWait, started_gcs,
-                              next_gc_start_ms, 1.0);
+                              next_gc_start_ms, 1.0, 0);
 }
 
 
 MemoryReducer::State RunState(int started_gcs, double next_gc_start_ms) {
   return MemoryReducer::State(MemoryReducer::kRun, started_gcs,
-                              next_gc_start_ms, 1.0);
+                              next_gc_start_ms, 1.0, 0);
 }
 
-
 MemoryReducer::Event MarkCompactEvent(double time_ms,
-                                      bool next_gc_likely_to_collect_more) {
+                                      bool next_gc_likely_to_collect_more,
+                                      size_t committed_memory) {
   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;
+  event.committed_memory = committed_memory;
   return event;
 }
 
+MemoryReducer::Event MarkCompactEventGarbageLeft(double time_ms,
+                                                 size_t committed_memory) {
+  return MarkCompactEvent(time_ms, true, committed_memory);
+}
 
-MemoryReducer::Event MarkCompactEventGarbageLeft(double time_ms) {
-  return MarkCompactEvent(time_ms, true);
+MemoryReducer::Event MarkCompactEventNoGarbageLeft(double time_ms,
+                                                   size_t committed_memory) {
+  return MarkCompactEvent(time_ms, false, committed_memory);
 }
 
 
-MemoryReducer::Event MarkCompactEventNoGarbageLeft(double time_ms) {
-  return MarkCompactEvent(time_ms, false);
-}
-
-
 MemoryReducer::Event TimerEvent(double time_ms,
                                 bool should_start_incremental_gc,
                                 bool can_start_incremental_gc) {
   MemoryReducer::Event event;
   event.type = MemoryReducer::kTimer;
   event.time_ms = time_ms;
   event.should_start_incremental_gc = should_start_incremental_gc;
   event.can_start_incremental_gc = can_start_incremental_gc;
   return event;
 }
@@ skipping 25 matching lines @@
   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);
+
+  state1 = MemoryReducer::Step(
+      state0,
+      MarkCompactEventGarbageLeft(0, MemoryReducer::kCommittedMemoryDelta - 1));
+  EXPECT_EQ(MemoryReducer::kDone, state1.action);
+
+  state0 = DoneState(1000 * MB);
+  state1 = MemoryReducer::Step(
+      state0, MarkCompactEventGarbageLeft(
+                  0, static_cast<size_t>(
+                         1000 * MB * MemoryReducer::kCommittedMemoryFactor) -
+                         1));
+  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(2));
+  state1 = MemoryReducer::Step(
+      state0,
+      MarkCompactEventGarbageLeft(2, MemoryReducer::kCommittedMemoryDelta));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
   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(2));
+  state1 = MemoryReducer::Step(
+      state0,
+      MarkCompactEventNoGarbageLeft(2, MemoryReducer::kCommittedMemoryDelta));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
   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, PossibleGarbageEvent(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);
+
+  state0 = DoneState(1000 * MB);
+  state1 = MemoryReducer::Step(
+      state0, MarkCompactEventGarbageLeft(
+                  2, static_cast<size_t>(
+                         1000 * MB * MemoryReducer::kCommittedMemoryFactor)));
+  EXPECT_EQ(MemoryReducer::kWait, state1.action);
+  EXPECT_EQ(MemoryReducer::kLongDelayMs + 2, state1.next_gc_start_ms);
+  EXPECT_EQ(0, state1.started_gcs);
+  EXPECT_EQ(2, 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, PossibleGarbageEvent(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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000, 0));
   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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000, 0));
   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);
 
   state0.last_gc_time_ms = 0;
   state1 = MemoryReducer::Step(
       state0,
       TimerEventHighAllocationRate(MemoryReducer::kWatchdogDelayMs + 1));
   EXPECT_EQ(MemoryReducer::kWait, state1.action);
@@ skipping 88 matching lines @@
   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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000, 0));
   EXPECT_EQ(MemoryReducer::kDone, state1.action);
   EXPECT_EQ(0, state1.next_gc_start_ms);
   EXPECT_EQ(MemoryReducer::kMaxNumberOfGCs, state1.started_gcs);
   EXPECT_EQ(2000, state1.last_gc_time_ms);
 
   state0.started_gcs = MemoryReducer::kMaxNumberOfGCs;
 
-  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000, 0));
   EXPECT_EQ(MemoryReducer::kDone, state1.action);
   EXPECT_EQ(0, state1.next_gc_start_ms);
   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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventGarbageLeft(2000, 0));
   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));
+  state1 = MemoryReducer::Step(state0, MarkCompactEventNoGarbageLeft(2000, 0));
   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