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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_HEAP_GC_IDLE_TIME_HANDLER_H_ | 5 #ifndef V8_HEAP_GC_IDLE_TIME_HANDLER_H_ |
6 #define V8_HEAP_GC_IDLE_TIME_HANDLER_H_ | 6 #define V8_HEAP_GC_IDLE_TIME_HANDLER_H_ |
7 | 7 |
8 #include "src/globals.h" | 8 #include "src/globals.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
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106 // An allocation throughput below kLowAllocationThroughput bytes/ms is | 106 // An allocation throughput below kLowAllocationThroughput bytes/ms is |
107 // considered low | 107 // considered low |
108 static const size_t kLowAllocationThroughput = 1000; | 108 static const size_t kLowAllocationThroughput = 1000; |
109 | 109 |
110 // If contexts are disposed at a higher rate a full gc is triggered. | 110 // If contexts are disposed at a higher rate a full gc is triggered. |
111 static const double kHighContextDisposalRate; | 111 static const double kHighContextDisposalRate; |
112 | 112 |
113 // Incremental marking step time. | 113 // Incremental marking step time. |
114 static const size_t kIncrementalMarkingStepTimeInMs = 1; | 114 static const size_t kIncrementalMarkingStepTimeInMs = 1; |
115 | 115 |
| 116 // Minimum incremental marking step time. |
| 117 static const size_t kMinIncrementalMarkingStepTimeInMs = |
| 118 kIncrementalMarkingStepTimeInMs + 1; |
| 119 |
116 static const size_t kMinTimeForOverApproximatingWeakClosureInMs; | 120 static const size_t kMinTimeForOverApproximatingWeakClosureInMs; |
117 | 121 |
118 // Number of times we will return a Nothing action in the current mode | 122 // Number of times we will return a Nothing action in the current mode |
119 // despite having idle time available before we returning a Done action to | 123 // despite having idle time available before we returning a Done action to |
120 // ensure we don't keep scheduling idle tasks and making no progress. | 124 // ensure we don't keep scheduling idle tasks and making no progress. |
121 static const int kMaxNoProgressIdleTimes = 10; | 125 static const int kMaxNoProgressIdleTimes = 10; |
122 | 126 |
123 GCIdleTimeHandler() : idle_times_which_made_no_progress_(0) {} | 127 GCIdleTimeHandler() : idle_times_which_made_no_progress_(0) {} |
124 | 128 |
125 GCIdleTimeAction Compute(double idle_time_in_ms, | 129 GCIdleTimeAction Compute(double idle_time_in_ms, |
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148 // Idle notifications with no progress. | 152 // Idle notifications with no progress. |
149 int idle_times_which_made_no_progress_; | 153 int idle_times_which_made_no_progress_; |
150 | 154 |
151 DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler); | 155 DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler); |
152 }; | 156 }; |
153 | 157 |
154 } // namespace internal | 158 } // namespace internal |
155 } // namespace v8 | 159 } // namespace v8 |
156 | 160 |
157 #endif // V8_HEAP_GC_IDLE_TIME_HANDLER_H_ | 161 #endif // V8_HEAP_GC_IDLE_TIME_HANDLER_H_ |
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