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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/threading/platform_thread_metrics.h"
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include "base/check.h"
#include "base/containers/span.h"
#include "base/files/file_path.h"
#include "base/numerics/clamped_math.h"
#include "base/process/internal_linux.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
namespace base {
namespace {
// Get the total CPU from a proc stat buffer. Return value is a TimeDelta
// converted from a number of jiffies on success or nullopt if parsing failed.
std::optional<TimeDelta> ParseTotalCPUTimeFromStats(
span<std::string_view> proc_stats) {
const std::optional<int64_t> utime =
internal::GetProcStatsFieldAsOptionalInt64(proc_stats,
internal::VM_UTIME);
if (utime.value_or(-1) < 0) {
return std::nullopt;
}
const std::optional<int64_t> stime =
internal::GetProcStatsFieldAsOptionalInt64(proc_stats,
internal::VM_STIME);
if (stime.value_or(-1) < 0) {
return std::nullopt;
}
const TimeDelta cpu_time =
internal::ClockTicksToTimeDelta(ClampAdd(utime.value(), stime.value()));
CHECK(!cpu_time.is_negative());
return cpu_time;
}
} // namespace
std::optional<TimeDelta> PlatformThreadMetrics::GetCumulativeCPUUsage() {
TRACE_EVENT("base", "Thread::GetCumulativeCPUUsage");
const auto thread_stat_path = FilePath(internal::kProcDir)
.Append(NumberToString(tid_.raw()))
.Append(internal::kStatFile);
std::string buffer;
std::vector<std::string_view> proc_stats;
if (!internal::ReadProcFile(thread_stat_path, &buffer) ||
!internal::ParseProcStats(buffer, &proc_stats)) {
return std::nullopt;
}
return ParseTotalCPUTimeFromStats(proc_stats);
}
} // namespace base
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