Bertrand SIMONNET | 0ada2ca | 2015-11-02 14:08:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "collectors/cpu_usage_collector.h" |
| 18 | |
| 19 | #include <base/bind.h> |
| 20 | #include <base/files/file_path.h> |
| 21 | #include <base/files/file_util.h> |
| 22 | #include <base/message_loop/message_loop.h> |
| 23 | #include <base/strings/string_number_conversions.h> |
| 24 | #include <base/strings/string_split.h> |
| 25 | #include <base/strings/string_util.h> |
| 26 | #include <base/sys_info.h> |
| 27 | |
| 28 | #include "metrics/metrics_library.h" |
| 29 | |
| 30 | namespace { |
| 31 | |
| 32 | const char kCpuUsagePercent[] = "Platform.CpuUsage.Percent"; |
| 33 | const char kMetricsProcStatFileName[] = "/proc/stat"; |
| 34 | const int kMetricsProcStatFirstLineItemsCount = 11; |
| 35 | |
| 36 | // Collect every minute. |
| 37 | const int kCollectionIntervalSecs = 60; |
| 38 | |
| 39 | } // namespace |
| 40 | |
| 41 | using base::TimeDelta; |
| 42 | |
| 43 | CpuUsageCollector::CpuUsageCollector(MetricsLibraryInterface* metrics_library) { |
| 44 | CHECK(metrics_library); |
| 45 | metrics_lib_ = metrics_library; |
| 46 | collect_interval_ = TimeDelta::FromSeconds(kCollectionIntervalSecs); |
| 47 | } |
| 48 | |
| 49 | void CpuUsageCollector::Init() { |
| 50 | num_cpu_ = base::SysInfo::NumberOfProcessors(); |
| 51 | |
| 52 | // Get ticks per second (HZ) on this system. |
| 53 | // Sysconf cannot fail, so no sanity checks are needed. |
| 54 | ticks_per_second_ = sysconf(_SC_CLK_TCK); |
| 55 | CHECK_GT(ticks_per_second_, uint64_t(0)) |
| 56 | << "Number of ticks per seconds should be positive."; |
| 57 | |
| 58 | latest_cpu_use_ = GetCumulativeCpuUse(); |
| 59 | } |
| 60 | |
| 61 | void CpuUsageCollector::CollectCallback() { |
| 62 | Collect(); |
| 63 | Schedule(); |
| 64 | } |
| 65 | |
| 66 | void CpuUsageCollector::Schedule() { |
| 67 | base::MessageLoop::current()->PostDelayedTask(FROM_HERE, |
| 68 | base::Bind(&CpuUsageCollector::CollectCallback, base::Unretained(this)), |
| 69 | collect_interval_); |
| 70 | } |
| 71 | |
| 72 | void CpuUsageCollector::Collect() { |
| 73 | TimeDelta cpu_use = GetCumulativeCpuUse(); |
| 74 | TimeDelta diff_per_cpu = (cpu_use - latest_cpu_use_) / num_cpu_; |
| 75 | latest_cpu_use_ = cpu_use; |
| 76 | |
| 77 | // Report the cpu usage as a percentage of the total cpu usage possible. |
| 78 | int percent_use = diff_per_cpu.InMilliseconds() * 100 / |
| 79 | (kCollectionIntervalSecs * 1000); |
| 80 | |
| 81 | metrics_lib_->SendEnumToUMA(kCpuUsagePercent, percent_use, 101); |
| 82 | } |
| 83 | |
| 84 | TimeDelta CpuUsageCollector::GetCumulativeCpuUse() { |
| 85 | base::FilePath proc_stat_path(kMetricsProcStatFileName); |
| 86 | std::string proc_stat_string; |
| 87 | if (!base::ReadFileToString(proc_stat_path, &proc_stat_string)) { |
| 88 | LOG(WARNING) << "cannot open " << kMetricsProcStatFileName; |
| 89 | return TimeDelta(); |
| 90 | } |
| 91 | |
| 92 | uint64_t user_ticks, user_nice_ticks, system_ticks; |
| 93 | if (!ParseProcStat(proc_stat_string, &user_ticks, &user_nice_ticks, |
| 94 | &system_ticks)) { |
| 95 | return TimeDelta(); |
| 96 | } |
| 97 | |
| 98 | uint64_t total = user_ticks + user_nice_ticks + system_ticks; |
| 99 | return TimeDelta::FromMicroseconds( |
| 100 | total * 1000 * 1000 / ticks_per_second_); |
| 101 | } |
| 102 | |
| 103 | bool CpuUsageCollector::ParseProcStat(const std::string& stat_content, |
| 104 | uint64_t *user_ticks, |
| 105 | uint64_t *user_nice_ticks, |
| 106 | uint64_t *system_ticks) { |
Alex Vakulenko | ea05ff9 | 2016-01-20 07:53:57 -0800 | [diff] [blame] | 107 | std::vector<std::string> proc_stat_lines = base::SplitString( |
| 108 | stat_content, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL); |
Bertrand SIMONNET | 0ada2ca | 2015-11-02 14:08:44 -0800 | [diff] [blame] | 109 | if (proc_stat_lines.empty()) { |
| 110 | LOG(WARNING) << "No lines found in " << kMetricsProcStatFileName; |
| 111 | return false; |
| 112 | } |
Alex Vakulenko | ea05ff9 | 2016-01-20 07:53:57 -0800 | [diff] [blame] | 113 | std::vector<std::string> proc_stat_totals = |
| 114 | base::SplitString(proc_stat_lines[0], base::kWhitespaceASCII, |
| 115 | base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY); |
Bertrand SIMONNET | 0ada2ca | 2015-11-02 14:08:44 -0800 | [diff] [blame] | 116 | |
| 117 | if (proc_stat_totals.size() != kMetricsProcStatFirstLineItemsCount || |
| 118 | proc_stat_totals[0] != "cpu" || |
| 119 | !base::StringToUint64(proc_stat_totals[1], user_ticks) || |
| 120 | !base::StringToUint64(proc_stat_totals[2], user_nice_ticks) || |
| 121 | !base::StringToUint64(proc_stat_totals[3], system_ticks)) { |
| 122 | LOG(WARNING) << "cannot parse first line: " << proc_stat_lines[0]; |
| 123 | return false; |
| 124 | } |
| 125 | return true; |
| 126 | } |