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/*
* Copyright (C) 2015 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.
*/
#include "collectors/cpu_usage_collector.h"
#include <base/bind.h>
#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/message_loop/message_loop.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_split.h>
#include <base/strings/string_util.h>
#include <base/sys_info.h>
#include "metrics/metrics_library.h"
namespace {
const char kCpuUsagePercent[] = "Platform.CpuUsage.Percent";
const char kMetricsProcStatFileName[] = "/proc/stat";
const int kMetricsProcStatFirstLineItemsCount = 11;
// Collect every minute.
const int kCollectionIntervalSecs = 60;
} // namespace
using base::TimeDelta;
CpuUsageCollector::CpuUsageCollector(MetricsLibraryInterface* metrics_library) {
CHECK(metrics_library);
metrics_lib_ = metrics_library;
collect_interval_ = TimeDelta::FromSeconds(kCollectionIntervalSecs);
}
void CpuUsageCollector::Init() {
num_cpu_ = base::SysInfo::NumberOfProcessors();
// Get ticks per second (HZ) on this system.
// Sysconf cannot fail, so no sanity checks are needed.
ticks_per_second_ = sysconf(_SC_CLK_TCK);
CHECK_GT(ticks_per_second_, uint64_t(0))
<< "Number of ticks per seconds should be positive.";
latest_cpu_use_ = GetCumulativeCpuUse();
}
void CpuUsageCollector::CollectCallback() {
Collect();
Schedule();
}
void CpuUsageCollector::Schedule() {
base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
base::Bind(&CpuUsageCollector::CollectCallback, base::Unretained(this)),
collect_interval_);
}
void CpuUsageCollector::Collect() {
TimeDelta cpu_use = GetCumulativeCpuUse();
TimeDelta diff_per_cpu = (cpu_use - latest_cpu_use_) / num_cpu_;
latest_cpu_use_ = cpu_use;
// Report the cpu usage as a percentage of the total cpu usage possible.
int percent_use = diff_per_cpu.InMilliseconds() * 100 /
(kCollectionIntervalSecs * 1000);
metrics_lib_->SendEnumToUMA(kCpuUsagePercent, percent_use, 101);
}
TimeDelta CpuUsageCollector::GetCumulativeCpuUse() {
base::FilePath proc_stat_path(kMetricsProcStatFileName);
std::string proc_stat_string;
if (!base::ReadFileToString(proc_stat_path, &proc_stat_string)) {
LOG(WARNING) << "cannot open " << kMetricsProcStatFileName;
return TimeDelta();
}
uint64_t user_ticks, user_nice_ticks, system_ticks;
if (!ParseProcStat(proc_stat_string, &user_ticks, &user_nice_ticks,
&system_ticks)) {
return TimeDelta();
}
uint64_t total = user_ticks + user_nice_ticks + system_ticks;
return TimeDelta::FromMicroseconds(
total * 1000 * 1000 / ticks_per_second_);
}
bool CpuUsageCollector::ParseProcStat(const std::string& stat_content,
uint64_t *user_ticks,
uint64_t *user_nice_ticks,
uint64_t *system_ticks) {
std::vector<std::string> proc_stat_lines = base::SplitString(
stat_content, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
if (proc_stat_lines.empty()) {
LOG(WARNING) << "No lines found in " << kMetricsProcStatFileName;
return false;
}
std::vector<std::string> proc_stat_totals =
base::SplitString(proc_stat_lines[0], base::kWhitespaceASCII,
base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
if (proc_stat_totals.size() != kMetricsProcStatFirstLineItemsCount ||
proc_stat_totals[0] != "cpu" ||
!base::StringToUint64(proc_stat_totals[1], user_ticks) ||
!base::StringToUint64(proc_stat_totals[2], user_nice_ticks) ||
!base::StringToUint64(proc_stat_totals[3], system_ticks)) {
LOG(WARNING) << "cannot parse first line: " << proc_stat_lines[0];
return false;
}
return true;
}
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