1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef ECMASCRIPT_MEM_SHARED_MEM_CONTROLLER_H
17 #define ECMASCRIPT_MEM_SHARED_MEM_CONTROLLER_H
18 
19 #include <chrono>
20 #include <cmath>
21 #include <limits>
22 
23 #include "ecmascript/base/gc_ring_buffer.h"
24 #include "ecmascript/mem/mem_controller_utils.h"
25 #include "ecmascript/mem/mem.h"
26 
27 namespace panda::ecmascript {
28 class SharedHeap;
29 
30 using Clock = std::chrono::high_resolution_clock;
31 using BytesAndDuration = std::pair<uint64_t, double>;
32 
33 class SharedMemController {
34 public:
SharedMemController(const SharedHeap* sheap)35     explicit SharedMemController(const SharedHeap* sheap):sheap_(sheap){};
36     SharedMemController() = default;
37     ~SharedMemController() = default;
38     NO_COPY_SEMANTIC(SharedMemController);
39     NO_MOVE_SEMANTIC(SharedMemController);
40 
41     void RecordAllocationForIdle();
42     bool CheckLowAllocationUsageState() const;
43     void UpdateAllocationAfterGC();
44 
GetIdleSharedSpaceAllocationThroughputPerMS() const45     double GetIdleSharedSpaceAllocationThroughputPerMS() const
46     {
47         return MemControllerUtils::CalculateAverageSpeed(recordedSharedSpaceAllocations_);
48     }
49 
GetLastGCOldSpaceObjectUsageRate() const50     double GetLastGCOldSpaceObjectUsageRate() const
51     {
52         return lastGCOldSpaceObjectUsageRate_;
53     }
54 
GetLastGCObjectUsageRate() const55     double GetLastGCObjectUsageRate() const
56     {
57         return lastGCObjectUsageRate_;
58     }
59 
60 private:
61     const SharedHeap *sheap_ {nullptr};
62 
63     double allocTimeMsSharedIdle_ {0.0};
64     size_t sharedSpaceAllocSizeSinceIdle_ {0};
65     double lastGCObjectUsageRate_ {1.0f};
66     double lastGCOldSpaceObjectUsageRate_ {1.0f};
67     base::GCRingBuffer<BytesAndDuration, MemControllerUtils::LENGTH> recordedSharedSpaceAllocations_;
68 };
69 
70 }  // namespace panda::ecmascript
71 #endif  // ECMASCRIPT_MEM_SHARED_MEM_CONTROLLER_H
72