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Optimistically read from /proc for process stats. (youtube#3374)
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| // Copyright 2024 The Cobalt Authors. All Rights Reserved. | ||
| // | ||
| // 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. | ||
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| #include "cobalt/base/process/process_metrics_helper.h" | ||
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| #include <atomic> | ||
| #include <cmath> | ||
| #include <memory> | ||
| #include <string> | ||
| #include <utility> | ||
| #include <vector> | ||
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| #include "base/files/file_enumerator.h" | ||
| #include "base/files/file_path.h" | ||
| #include "base/files/file_util.h" | ||
| #include "base/memory/ptr_util.h" | ||
| #include "base/process/internal_linux.h" | ||
| #include "base/strings/string_number_conversions.h" | ||
| #include "base/strings/string_split.h" | ||
| #include "base/strings/string_util.h" | ||
| #include "base/time/time.h" | ||
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| namespace base { | ||
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| namespace { | ||
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| static std::atomic<int> clock_ticks_per_s{0}; | ||
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| ProcessMetricsHelper::ReadCallback GetReadCallback(const FilePath& path) { | ||
| return BindOnce( | ||
| [](const FilePath& path) -> absl::optional<std::string> { | ||
| std::string contents; | ||
| if (!ReadFileToString(path, &contents)) return absl::nullopt; | ||
| return std::move(contents); | ||
| }, | ||
| path); | ||
| } | ||
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| double CalculateCPUUsageSeconds(const std::string& utime_string, | ||
| const std::string& stime_string, | ||
| int ticks_per_s) { | ||
| DCHECK_NE(ticks_per_s, 0); | ||
| double utime; | ||
| if (!StringToDouble(utime_string, &utime)) return 0.0; | ||
| double stime; | ||
| if (!StringToDouble(stime_string, &stime)) return 0.0; | ||
| return (utime + stime) / static_cast<double>(ticks_per_s); | ||
| } | ||
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| } // namespace | ||
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| // static | ||
| int ProcessMetricsHelper::GetClockTicksPerS() { | ||
| return clock_ticks_per_s.load(); | ||
| } | ||
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| // static | ||
| int ProcessMetricsHelper::GetClockTicksPerS(ReadCallback uptime_callback, | ||
| ReadCallback stat_callback) { | ||
| double current_uptime = 0.0; | ||
| { | ||
| auto uptime_contents = std::move(uptime_callback).Run(); | ||
| if (!uptime_contents) return 0; | ||
| auto parts = SplitString(*uptime_contents, " ", TRIM_WHITESPACE, | ||
| SPLIT_WANT_NONEMPTY); | ||
| if (parts.size() == 0 || !StringToDouble(parts[0], ¤t_uptime) || | ||
| current_uptime == 0.0) { | ||
| return 0; | ||
| } | ||
| } | ||
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| auto fields = GetProcStatFields(std::move(stat_callback), | ||
| {internal::ProcStatsFields::VM_STARTTIME}); | ||
| if (fields.size() != 1) return 0; | ||
| double process_starttime; | ||
| if (!StringToDouble(fields[0], &process_starttime) || | ||
| process_starttime == 0.0) | ||
| return 0; | ||
| double ticks_per_s = process_starttime / current_uptime; | ||
| int rounded_up = 10 * static_cast<int>(std::ceil(ticks_per_s / 10.0)); | ||
| return rounded_up; | ||
| } | ||
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| // static | ||
| void ProcessMetricsHelper::PopulateClockTicksPerS() { | ||
| DCHECK_EQ(clock_ticks_per_s.load(), 0); | ||
| clock_ticks_per_s.store( | ||
| GetClockTicksPerS(GetReadCallback(FilePath("/proc/uptime")), | ||
| GetReadCallback(FilePath("/proc/self/stat")))); | ||
| } | ||
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| // static | ||
| TimeDelta ProcessMetricsHelper::GetCumulativeCPUUsage() { | ||
| int ticks_per_s = clock_ticks_per_s.load(); | ||
| if (ticks_per_s == 0) return TimeDelta(); | ||
| return GetCPUUsage(FilePath("/proc/self"), ticks_per_s); | ||
| } | ||
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| // static | ||
| Value ProcessMetricsHelper::GetCumulativeCPUUsagePerThread() { | ||
| int ticks_per_s = clock_ticks_per_s.load(); | ||
| if (ticks_per_s == 0) return Value(); | ||
| Value::List cpu_per_thread; | ||
| FileEnumerator file_enum(FilePath("/proc/self/task"), /*recursive=*/false, | ||
| FileEnumerator::DIRECTORIES); | ||
| for (FilePath path = file_enum.Next(); !path.empty(); | ||
| path = file_enum.Next()) { | ||
| Fields fields = | ||
| GetProcStatFields(path, {0, internal::ProcStatsFields::VM_COMM, | ||
| internal::ProcStatsFields::VM_UTIME, | ||
| internal::ProcStatsFields::VM_STIME}); | ||
| if (fields.size() != 4) continue; | ||
| int id; | ||
| if (!StringToInt(fields[0], &id)) continue; | ||
| Value::Dict entry = | ||
| Value::Dict() | ||
| .Set("id", id) | ||
| .Set("name", fields[1]) | ||
| .Set("utime", fields[2]) | ||
| .Set("stime", fields[3]) | ||
| .Set("usage_seconds", | ||
| CalculateCPUUsageSeconds(fields[2], fields[3], ticks_per_s)); | ||
| cpu_per_thread.Append(std::move(entry)); | ||
| } | ||
| return Value(std::move(cpu_per_thread)); | ||
| } | ||
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| // static | ||
| ProcessMetricsHelper::Fields ProcessMetricsHelper::GetProcStatFields( | ||
| ReadCallback read_callback, std::initializer_list<int> indices) { | ||
| absl::optional<std::string> contents = std::move(read_callback).Run(); | ||
| if (!contents) return Fields(); | ||
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| std::vector<std::string> proc_stats; | ||
| if (!internal::ParseProcStats(*contents, &proc_stats)) return Fields(); | ||
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| Fields fields; | ||
| for (int index : indices) { | ||
| if (index < 0 || index >= proc_stats.size()) return Fields(); | ||
| fields.push_back(std::move(proc_stats[index])); | ||
| } | ||
| return std::move(fields); | ||
| } | ||
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| // static | ||
| ProcessMetricsHelper::Fields ProcessMetricsHelper::GetProcStatFields( | ||
| const FilePath& path, std::initializer_list<int> indices) { | ||
| return ProcessMetricsHelper::GetProcStatFields( | ||
| GetReadCallback(path.Append("stat")), indices); | ||
| } | ||
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| // static | ||
| TimeDelta ProcessMetricsHelper::GetCPUUsage(ReadCallback read_callback, | ||
| int ticks_per_s) { | ||
| auto fields = ProcessMetricsHelper::GetProcStatFields( | ||
| std::move(read_callback), {internal::ProcStatsFields::VM_UTIME, | ||
| internal::ProcStatsFields::VM_STIME}); | ||
| if (fields.size() != 2) return TimeDelta(); | ||
| return TimeDelta::FromSecondsD( | ||
| CalculateCPUUsageSeconds(fields[0], fields[1], ticks_per_s)); | ||
| } | ||
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| // static | ||
| TimeDelta ProcessMetricsHelper::GetCPUUsage(const FilePath& path, | ||
| int ticks_per_s) { | ||
| return ProcessMetricsHelper::GetCPUUsage(GetReadCallback(path.Append("stat")), | ||
| ticks_per_s); | ||
| } | ||
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| } // namespace base |
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