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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* Copyright (C) 2021 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 specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "powerhal-adaptivecpu"
#define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
#include "CpuLoadReaderProcStat.h"
#include <android-base/logging.h>
#include <inttypes.h>
#include <utils/Trace.h>
#include <array>
#include <fstream>
#include <sstream>
#include <string>
namespace aidl {
namespace google {
namespace hardware {
namespace power {
namespace impl {
namespace pixel {
bool CpuLoadReaderProcStat::Init() {
mPreviousCpuTimes.clear();
return ReadCpuTimes(&mPreviousCpuTimes);
}
bool CpuLoadReaderProcStat::GetRecentCpuLoads(
std::array<double, NUM_CPU_CORES> *cpuCoreIdleTimesPercentage) {
ATRACE_CALL();
if (cpuCoreIdleTimesPercentage == nullptr) {
LOG(ERROR) << "Got nullptr output in getRecentCpuLoads";
return false;
}
std::map<uint32_t, CpuTime> cpuTimes;
if (!ReadCpuTimes(&cpuTimes)) {
return false;
}
if (cpuTimes.empty()) {
LOG(ERROR) << "Failed to find any CPU times";
return false;
}
for (const auto &[cpuId, cpuTime] : cpuTimes) {
const auto previousCpuTime = mPreviousCpuTimes.find(cpuId);
if (previousCpuTime == mPreviousCpuTimes.end()) {
LOG(ERROR) << "Couldn't find CPU " << cpuId << " in previous CPU times";
return false;
}
const auto recentIdleTimeMs = cpuTime.idleTimeMs - previousCpuTime->second.idleTimeMs;
const auto recentTotalTimeMs = cpuTime.totalTimeMs - previousCpuTime->second.totalTimeMs;
if (recentIdleTimeMs > recentTotalTimeMs) {
LOG(ERROR) << "Found more recent idle time than total time: idle=" << recentIdleTimeMs
<< ", total=" << recentTotalTimeMs;
return false;
}
const double idleTimePercentage =
static_cast<double>(recentIdleTimeMs) / (recentTotalTimeMs);
LOG(VERBOSE) << "Read CPU idle time: cpuId=" << cpuId
<< ", idleTimePercentage=" << idleTimePercentage;
(*cpuCoreIdleTimesPercentage)[cpuId] = idleTimePercentage;
}
mPreviousCpuTimes = cpuTimes;
return true;
}
bool CpuLoadReaderProcStat::ReadCpuTimes(std::map<uint32_t, CpuTime> *result) {
ATRACE_CALL();
std::unique_ptr<std::istream> file;
if (!mFilesystem->ReadFileStream("/proc/stat", &file)) {
return false;
}
std::string line;
ATRACE_BEGIN("loop");
while (std::getline(*file, line)) {
ATRACE_NAME("parse");
uint32_t cpuId;
// Times reported when the CPU is active.
uint64_t user, nice, system, irq, softIrq, steal, guest, guestNice;
// Times reported when the CPU is idle.
uint64_t idle, ioWait;
// Order & values taken from `fs/proc/stat.c`.
if (std::sscanf(line.c_str(),
"cpu%d %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64
" %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64 " ",
&cpuId, &user, &nice, &system, &idle, &ioWait, &irq, &softIrq, &steal,
&guest, &guestNice) != 11) {
continue;
}
uint64_t idleTimeJiffies = idle + ioWait;
uint64_t totalTimeJiffies =
user + nice + system + irq + softIrq + steal + guest + guestNice + idleTimeJiffies;
(*result)[cpuId] = {.idleTimeMs = JiffiesToMs(idleTimeJiffies),
.totalTimeMs = JiffiesToMs(totalTimeJiffies)};
}
ATRACE_END();
return true;
}
void CpuLoadReaderProcStat::DumpToStream(std::stringstream &stream) const {
stream << "CPU loads from /proc/stat:\n";
for (const auto &[cpuId, cpuTime] : mPreviousCpuTimes) {
stream << "- CPU=" << cpuId << ", idleTime=" << cpuTime.idleTimeMs
<< "ms, totalTime=" << cpuTime.totalTimeMs << "ms\n";
}
}
uint64_t CpuLoadReaderProcStat::JiffiesToMs(uint64_t jiffies) {
return (jiffies * 1000) / sysconf(_SC_CLK_TCK);
}
} // namespace pixel
} // namespace impl
} // namespace power
} // namespace hardware
} // namespace google
} // namespace aidl
|
