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/*
* Copyright (C) 2008 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 "bootchart.h"
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <time.h>
#include <unistd.h>
#include <chrono>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <thread>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
using android::base::StringPrintf;
using namespace std::chrono_literals;
namespace android {
namespace init {
static std::thread* g_bootcharting_thread;
static std::mutex g_bootcharting_finished_mutex;
static std::condition_variable g_bootcharting_finished_cv;
static bool g_bootcharting_finished;
static long long get_uptime_jiffies() {
std::string uptime;
if (!android::base::ReadFileToString("/proc/uptime", &uptime)) return 0;
return 100LL * strtod(uptime.c_str(), NULL);
}
static std::unique_ptr<FILE, decltype(&fclose)> fopen_unique(const char* filename,
const char* mode) {
std::unique_ptr<FILE, decltype(&fclose)> result(fopen(filename, mode), fclose);
if (!result) PLOG(ERROR) << "bootchart: failed to open " << filename;
return result;
}
static void log_header() {
char date[32];
time_t now_t = time(NULL);
struct tm now = *localtime(&now_t);
strftime(date, sizeof(date), "%F %T", &now);
utsname uts;
if (uname(&uts) == -1) return;
std::string fingerprint = android::base::GetProperty("ro.build.fingerprint", "");
if (fingerprint.empty()) return;
std::string kernel_cmdline;
android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
auto fp = fopen_unique("/data/bootchart/header", "we");
if (!fp) return;
fprintf(&*fp, "version = Android init 0.8\n");
fprintf(&*fp, "title = Boot chart for Android (%s)\n", date);
fprintf(&*fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
fprintf(&*fp, "system.release = %s\n", fingerprint.c_str());
// TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
fprintf(&*fp, "system.cpu = %s\n", uts.machine);
fprintf(&*fp, "system.kernel.options = %s\n", kernel_cmdline.c_str());
}
static void log_uptime(FILE* log) {
fprintf(log, "%lld\n", get_uptime_jiffies());
}
static void log_file(FILE* log, const char* procfile) {
log_uptime(log);
std::string content;
if (android::base::ReadFileToString(procfile, &content)) {
fprintf(log, "%s\n", content.c_str());
}
}
static void log_processes(FILE* log) {
log_uptime(log);
std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir("/proc"), closedir);
struct dirent* entry;
while ((entry = readdir(dir.get())) != NULL) {
// Only match numeric values.
int pid = atoi(entry->d_name);
if (pid == 0) continue;
// /proc/<pid>/stat only has truncated task names, so get the full
// name from /proc/<pid>/cmdline.
std::string cmdline;
android::base::ReadFileToString(StringPrintf("/proc/%d/cmdline", pid), &cmdline);
const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
// Read process stat line.
std::string stat;
if (android::base::ReadFileToString(StringPrintf("/proc/%d/stat", pid), &stat)) {
if (!cmdline.empty()) {
// Substitute the process name with its real name.
size_t open = stat.find('(');
size_t close = stat.find_last_of(')');
if (open != std::string::npos && close != std::string::npos) {
stat.replace(open + 1, close - open - 1, full_name);
}
}
fputs(stat.c_str(), log);
}
}
fputc('\n', log);
}
static void bootchart_thread_main() {
LOG(INFO) << "Bootcharting started";
// Open log files.
auto stat_log = fopen_unique("/data/bootchart/proc_stat.log", "we");
if (!stat_log) return;
auto proc_log = fopen_unique("/data/bootchart/proc_ps.log", "we");
if (!proc_log) return;
auto disk_log = fopen_unique("/data/bootchart/proc_diskstats.log", "we");
if (!disk_log) return;
log_header();
while (true) {
{
std::unique_lock<std::mutex> lock(g_bootcharting_finished_mutex);
g_bootcharting_finished_cv.wait_for(lock, 200ms);
if (g_bootcharting_finished) break;
}
log_file(&*stat_log, "/proc/stat");
log_file(&*disk_log, "/proc/diskstats");
log_processes(&*proc_log);
}
LOG(INFO) << "Bootcharting finished";
}
static Result<Success> do_bootchart_start() {
// We don't care about the content, but we do care that /data/bootchart/enabled actually exists.
std::string start;
if (!android::base::ReadFileToString("/data/bootchart/enabled", &start)) {
LOG(VERBOSE) << "Not bootcharting";
return Success();
}
g_bootcharting_thread = new std::thread(bootchart_thread_main);
return Success();
}
static Result<Success> do_bootchart_stop() {
if (!g_bootcharting_thread) return Success();
// Tell the worker thread it's time to quit.
{
std::lock_guard<std::mutex> lock(g_bootcharting_finished_mutex);
g_bootcharting_finished = true;
g_bootcharting_finished_cv.notify_one();
}
g_bootcharting_thread->join();
delete g_bootcharting_thread;
g_bootcharting_thread = nullptr;
return Success();
}
Result<Success> do_bootchart(const BuiltinArguments& args) {
if (args[1] == "start") return do_bootchart_start();
return do_bootchart_stop();
}
} // namespace init
} // namespace android
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