1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "bootchart.h"
18
19#include <dirent.h>
20#include <fcntl.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <sys/stat.h>
25#include <sys/utsname.h>
26#include <time.h>
27#include <unistd.h>
28
29#include <chrono>
30#include <condition_variable>
31#include <memory>
32#include <mutex>
33#include <thread>
34
35#include <android-base/file.h>
36#include <android-base/logging.h>
37#include <android-base/properties.h>
38#include <android-base/stringprintf.h>
39
40using android::base::StringPrintf;
41using namespace std::chrono_literals;
42
43namespace android {
44namespace init {
45
46static std::thread* g_bootcharting_thread;
47
48static std::mutex g_bootcharting_finished_mutex;
49static std::condition_variable g_bootcharting_finished_cv;
50static bool g_bootcharting_finished;
51
52static long long get_uptime_jiffies() {
53  std::string uptime;
54  if (!android::base::ReadFileToString("/proc/uptime", &uptime)) return 0;
55  return 100LL * strtod(uptime.c_str(), NULL);
56}
57
58static std::unique_ptr<FILE, decltype(&fclose)> fopen_unique(const char* filename,
59                                                             const char* mode) {
60  std::unique_ptr<FILE, decltype(&fclose)> result(fopen(filename, mode), fclose);
61  if (!result) PLOG(ERROR) << "bootchart: failed to open " << filename;
62  return result;
63}
64
65static void log_header() {
66  char date[32];
67  time_t now_t = time(NULL);
68  struct tm now = *localtime(&now_t);
69  strftime(date, sizeof(date), "%F %T", &now);
70
71  utsname uts;
72  if (uname(&uts) == -1) return;
73
74  std::string fingerprint = android::base::GetProperty("ro.build.fingerprint", "");
75  if (fingerprint.empty()) return;
76
77  std::string kernel_cmdline;
78  android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
79
80  auto fp = fopen_unique("/data/bootchart/header", "we");
81  if (!fp) return;
82  fprintf(&*fp, "version = Android init 0.8\n");
83  fprintf(&*fp, "title = Boot chart for Android (%s)\n", date);
84  fprintf(&*fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
85  fprintf(&*fp, "system.release = %s\n", fingerprint.c_str());
86  // TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
87  fprintf(&*fp, "system.cpu = %s\n", uts.machine);
88  fprintf(&*fp, "system.kernel.options = %s\n", kernel_cmdline.c_str());
89}
90
91static void log_uptime(FILE* log) {
92  fprintf(log, "%lld\n", get_uptime_jiffies());
93}
94
95static void log_file(FILE* log, const char* procfile) {
96  log_uptime(log);
97
98  std::string content;
99  if (android::base::ReadFileToString(procfile, &content)) {
100    fprintf(log, "%s\n", content.c_str());
101  }
102}
103
104static void log_processes(FILE* log) {
105  log_uptime(log);
106
107  std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir("/proc"), closedir);
108  struct dirent* entry;
109  while ((entry = readdir(dir.get())) != NULL) {
110    // Only match numeric values.
111    int pid = atoi(entry->d_name);
112    if (pid == 0) continue;
113
114    // /proc/<pid>/stat only has truncated task names, so get the full
115    // name from /proc/<pid>/cmdline.
116    std::string cmdline;
117    android::base::ReadFileToString(StringPrintf("/proc/%d/cmdline", pid), &cmdline);
118    const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
119
120    // Read process stat line.
121    std::string stat;
122    if (android::base::ReadFileToString(StringPrintf("/proc/%d/stat", pid), &stat)) {
123      if (!cmdline.empty()) {
124        // Substitute the process name with its real name.
125        size_t open = stat.find('(');
126        size_t close = stat.find_last_of(')');
127        if (open != std::string::npos && close != std::string::npos) {
128          stat.replace(open + 1, close - open - 1, full_name);
129        }
130      }
131      fputs(stat.c_str(), log);
132    }
133  }
134
135  fputc('\n', log);
136}
137
138static void bootchart_thread_main() {
139  LOG(INFO) << "Bootcharting started";
140
141  // Open log files.
142  auto stat_log = fopen_unique("/data/bootchart/proc_stat.log", "we");
143  if (!stat_log) return;
144  auto proc_log = fopen_unique("/data/bootchart/proc_ps.log", "we");
145  if (!proc_log) return;
146  auto disk_log = fopen_unique("/data/bootchart/proc_diskstats.log", "we");
147  if (!disk_log) return;
148
149  log_header();
150
151  while (true) {
152    {
153      std::unique_lock<std::mutex> lock(g_bootcharting_finished_mutex);
154      g_bootcharting_finished_cv.wait_for(lock, 200ms);
155      if (g_bootcharting_finished) break;
156    }
157
158    log_file(&*stat_log, "/proc/stat");
159    log_file(&*disk_log, "/proc/diskstats");
160    log_processes(&*proc_log);
161  }
162
163  LOG(INFO) << "Bootcharting finished";
164}
165
166static Result<Success> do_bootchart_start() {
167    // We don't care about the content, but we do care that /data/bootchart/enabled actually exists.
168    std::string start;
169    if (!android::base::ReadFileToString("/data/bootchart/enabled", &start)) {
170        LOG(VERBOSE) << "Not bootcharting";
171        return Success();
172    }
173
174    g_bootcharting_thread = new std::thread(bootchart_thread_main);
175    return Success();
176}
177
178static Result<Success> do_bootchart_stop() {
179    if (!g_bootcharting_thread) return Success();
180
181    // Tell the worker thread it's time to quit.
182    {
183        std::lock_guard<std::mutex> lock(g_bootcharting_finished_mutex);
184        g_bootcharting_finished = true;
185        g_bootcharting_finished_cv.notify_one();
186    }
187
188    g_bootcharting_thread->join();
189    delete g_bootcharting_thread;
190    g_bootcharting_thread = nullptr;
191    return Success();
192}
193
194Result<Success> do_bootchart(const BuiltinArguments& args) {
195    if (args[1] == "start") return do_bootchart_start();
196    return do_bootchart_stop();
197}
198
199}  // namespace init
200}  // namespace android
201