1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specic language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_LIBPERFMGR_NODE_H_
#define ANDROID_LIBPERFMGR_NODE_H_
#include <cstddef>
#include <string>
#include <vector>
#include <android-base/unique_fd.h>
#include "perfmgr/RequestGroup.h"
namespace android {
namespace perfmgr {
// The Node class provides an interface for adding and cancelling powerhint
// requests, as well as checking the next time that an in-progress powerhint
// request will expire. There are additional methods for getting the Node’s name
// and the index of a value, which may be used for initialization, debugging,
// and request management. The core of the Node class is a vector of
// RequestGroups named req_sorted_, which is used to track the in-progress
// requests on the node. Each entry in the vector corresponds to a possible
// value for the node, in priority order. For example, the first entry in the
// vector for the cpu0 cluster represents the in-progress requests to boost the
// cluster’s frequency to the highest available value. The next entry represents
// the in-progress requests to boost the cluster’s frequency to the next highest
// value. For each value, there may be multiple requests because different
// powerhints may request the same value, and the requests may have different
// expiration times. All of the in-progress powerhints for a given value are
// collected in a RequestGroup. Node class is not thread safe so it needs
// protection from caller e.g. NodeLooperThread.
class Node {
public:
Node(std::string name, std::string node_path,
std::vector<RequestGroup> req_sorted, std::size_t default_val_index,
bool reset_on_init, bool hold_fd = false);
// Return true if successfully add a request
bool AddRequest(std::size_t value_index, const std::string& hint_type,
ReqTime end_time);
// Return true if successfully remove a request
bool RemoveRequest(const std::string& hint_type);
// Return the nearest expire time of active requests; return
// std::chrono::milliseconds::max() if no active request on Node; update
// node's controlled file node value and the current value index based on
// active request.
std::chrono::milliseconds Update();
std::string GetName() const;
std::string GetPath() const;
std::vector<std::string> GetValues() const;
std::size_t GetDefaultIndex() const;
bool GetResetOnInit() const;
bool GetHoldFd() const;
bool GetValueIndex(const std::string value, std::size_t* index) const;
void DumpToFd(int fd);
private:
Node(const Node& other) = delete;
Node& operator=(Node const&) = delete;
const std::string name_;
const std::string node_path_;
// request vector, one entry per possible value, sorted by priority
std::vector<RequestGroup> req_sorted_;
const std::size_t default_val_index_;
std::size_t current_val_index_;
const bool reset_on_init_;
const bool hold_fd_;
android::base::unique_fd fd_;
};
} // namespace perfmgr
} // namespace android
#endif // ANDROID_LIBPERFMGR_NODE_H_
|
