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#include "ecmascript/mem/mem_controller_utils.h"
17
18#include "ecmascript/mem/mem_common.h"
19
20namespace panda::ecmascript {
21
22double MemControllerUtils::CalculateAverageSpeed(const base::GCRingBuffer<BytesAndDuration, LENGTH> &buffer)
23{
24    return CalculateAverageSpeed(buffer, MakeBytesAndDuration(0, 0), 0);
25}
26
27double MemControllerUtils::CalculateAverageSpeed(const base::GCRingBuffer<BytesAndDuration, LENGTH> &buffer,
28    const BytesAndDuration &initial, const double timeMs)
29{
30    BytesAndDuration sum = buffer.Sum(
31        [timeMs](BytesAndDuration a, BytesAndDuration b) {
32            if (timeMs != 0 && a.second >= timeMs) {
33                return a;
34            }
35            return std::make_pair(a.first + b.first, a.second + b.second);
36        },
37        initial);
38    uint64_t bytes = sum.first;
39    double durations = sum.second;
40    if (fabs(durations) <= 1e-6) {
41        return 0;
42    }
43    double speed = bytes / durations;
44    const int maxSpeed = static_cast<int>(1_GB);
45    const int minSpeed = 1;
46    if (speed >= maxSpeed) {
47        return maxSpeed;
48    }
49    if (speed <= minSpeed) {
50        return minSpeed;
51    }
52    return speed;
53}
54
55}