When context disposal rate is high and we cannot perform a full GC, we do nothing until the context…

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 251 matching lines @@
 TEST_F(GCIdleTimeHandlerTest, ContextDisposeHighRate) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   heap_state.contexts_disposed = 1;
   heap_state.contexts_disposal_rate =
       GCIdleTimeHandler::kHighContextDisposalRate - 1;
   heap_state.incremental_marking_stopped = true;
   double idle_time_ms = 0;
   for (int mode = 0; mode < 1; mode++) {
     GCIdleTimeAction action = handler()->Compute(idle_time_ms, heap_state);
     EXPECT_EQ(DO_FULL_GC, action.type);
+    heap_state.contexts_disposal_rate = 0.0;
     TransitionToReduceMemoryMode(heap_state);
   }
 }
 
 
 TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeZeroIdleTime) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   heap_state.contexts_disposed = 1;
   heap_state.contexts_disposal_rate = 1.0;
   heap_state.incremental_marking_stopped = true;
   double idle_time_ms = 0;
   for (int mode = 0; mode < 1; mode++) {
     GCIdleTimeAction action = handler()->Compute(idle_time_ms, heap_state);
     EXPECT_EQ(DO_FULL_GC, action.type);
+    heap_state.contexts_disposal_rate = 0.0;
     TransitionToReduceMemoryMode(heap_state);
   }
 }
 
 
 TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeSmallIdleTime1) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   heap_state.contexts_disposed = 1;
-  heap_state.contexts_disposal_rate = 1.0;
+  heap_state.contexts_disposal_rate =
+      GCIdleTimeHandler::kHighContextDisposalRate;
   heap_state.incremental_marking_stopped = true;
   size_t speed = heap_state.mark_compact_speed_in_bytes_per_ms;
   double idle_time_ms =
       static_cast<double>(heap_state.size_of_objects / speed - 1);
   for (int mode = 0; mode < 1; mode++) {
     GCIdleTimeAction action = handler()->Compute(idle_time_ms, heap_state);
     EXPECT_EQ(DO_INCREMENTAL_MARKING, action.type);
+    heap_state.contexts_disposal_rate = 0.0;
     TransitionToReduceMemoryMode(heap_state);
   }
 }
 
 
 TEST_F(GCIdleTimeHandlerTest, AfterContextDisposeSmallIdleTime2) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   heap_state.contexts_disposed = 1;
-  heap_state.contexts_disposal_rate = 1.0;
+  heap_state.contexts_disposal_rate =
+      GCIdleTimeHandler::kHighContextDisposalRate;
   size_t speed = heap_state.mark_compact_speed_in_bytes_per_ms;
   double idle_time_ms =
       static_cast<double>(heap_state.size_of_objects / speed - 1);
   for (int mode = 0; mode < 1; mode++) {
     GCIdleTimeAction action = handler()->Compute(idle_time_ms, heap_state);
     EXPECT_EQ(DO_INCREMENTAL_MARKING, action.type);
+    heap_state.contexts_disposal_rate = 0.0;
     TransitionToReduceMemoryMode(heap_state);
   }
 }
 
 
 TEST_F(GCIdleTimeHandlerTest, IncrementalMarking1) {
   GCIdleTimeHandler::HeapState heap_state = DefaultHeapState();
   size_t speed = heap_state.incremental_marking_speed_in_bytes_per_ms;
   double idle_time_ms = 10;
   for (int mode = 0; mode < 1; mode++) {
@@ skipping 293 matching lines @@
     handler()->NotifyMarkCompact();
     handler()->NotifyIdleMarkCompact();
   }
   action = handler()->Compute(idle_time_ms, heap_state);
   EXPECT_EQ(DONE, action.type);
 }
 
 
 }  // namespace internal
 }  // namespace v8