-
Notifications
You must be signed in to change notification settings - Fork 116
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Optimistically read from /proc for process stats.
b/341774149
- Loading branch information
1 parent
515d982
commit 4dfe9e7
Showing
8 changed files
with
505 additions
and
10 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| // 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. | ||
|
|
||
| #include "cobalt/base/process/process_metrics_helper.h" | ||
|
|
||
| #include <atomic> | ||
| #include <memory> | ||
| #include <string> | ||
| #include <utility> | ||
| #include <vector> | ||
|
|
||
| #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" | ||
|
|
||
| namespace base { | ||
|
|
||
| namespace { | ||
|
|
||
| static std::atomic<int> clock_ticks_per_s{0}; | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| } // namespace | ||
|
|
||
| // static | ||
| int ProcessMetricsHelper::GetClockTicksPerS() { | ||
| return clock_ticks_per_s.load(); | ||
| } | ||
|
|
||
| // static | ||
| int ProcessMetricsHelper::GetClockTicksPerS(ReadCallback uptime_callback, | ||
| ReadCallback stat_callback) { | ||
| double 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], &uptime) || | ||
| uptime == 0.0) { | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| auto fields = GetProcStatFields(std::move(stat_callback), | ||
| {internal::ProcStatsFields::VM_STARTTIME}); | ||
| if (fields.size() != 1) return 0; | ||
| double starttime; | ||
| if (!StringToDouble(fields[0], &starttime) || starttime == 0.0) return 0; | ||
| int ticks_per_s = static_cast<int>(starttime / uptime); | ||
| int nearest_tens = 10 * ((ticks_per_s + 5) / 10); | ||
| return nearest_tens; | ||
| } | ||
|
|
||
| // 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")))); | ||
| } | ||
|
|
||
| // 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); | ||
| } | ||
|
|
||
| // 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)); | ||
| } | ||
|
|
||
| // 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(); | ||
|
|
||
| std::vector<std::string> proc_stats; | ||
| if (!internal::ParseProcStats(*contents, &proc_stats)) return Fields(); | ||
|
|
||
| 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); | ||
| } | ||
|
|
||
| // static | ||
| ProcessMetricsHelper::Fields ProcessMetricsHelper::GetProcStatFields( | ||
| const FilePath& path, std::initializer_list<int> indices) { | ||
| return ProcessMetricsHelper::GetProcStatFields( | ||
| GetReadCallback(path.Append("stat")), indices); | ||
| } | ||
|
|
||
| // 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)); | ||
| } | ||
|
|
||
| // static | ||
| TimeDelta ProcessMetricsHelper::GetCPUUsage(const FilePath& path, | ||
| int ticks_per_s) { | ||
| return ProcessMetricsHelper::GetCPUUsage(GetReadCallback(path.Append("stat")), | ||
| ticks_per_s); | ||
| } | ||
|
|
||
| } // namespace base |
Oops, something went wrong.