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/chrono_utils.h>
36 #include <android-base/file.h>
37 #include <android-base/logging.h>
38 #include <android-base/properties.h>
39 #include <android-base/stringprintf.h>
40
41 using android::base::StringPrintf;
42 using android::base::boot_clock;
43 using namespace std::chrono_literals;
44
45 namespace android {
46 namespace init {
47
48 static std::thread* g_bootcharting_thread;
49
50 static std::mutex g_bootcharting_finished_mutex;
51 static std::condition_variable g_bootcharting_finished_cv;
52 static bool g_bootcharting_finished;
53
get_uptime_jiffies()54 static long long get_uptime_jiffies() {
55 constexpr int64_t kNanosecondsPerJiffy = 10000000;
56 boot_clock::time_point uptime = boot_clock::now();
57 return uptime.time_since_epoch().count() / kNanosecondsPerJiffy;
58 }
59
fopen_unique(const char * filename,const char * mode)60 static std::unique_ptr<FILE, decltype(&fclose)> fopen_unique(const char* filename,
61 const char* mode) {
62 std::unique_ptr<FILE, decltype(&fclose)> result(fopen(filename, mode), fclose);
63 if (!result) PLOG(ERROR) << "bootchart: failed to open " << filename;
64 return result;
65 }
66
log_header()67 static void log_header() {
68 char date[32];
69 time_t now_t = time(NULL);
70 struct tm now = *localtime(&now_t);
71 strftime(date, sizeof(date), "%F %T", &now);
72
73 utsname uts;
74 if (uname(&uts) == -1) return;
75
76 std::string fingerprint = android::base::GetProperty("ro.build.fingerprint", "");
77 if (fingerprint.empty()) return;
78
79 std::string kernel_cmdline;
80 android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
81
82 auto fp = fopen_unique("/data/bootchart/header", "we");
83 if (!fp) return;
84 fprintf(&*fp, "version = Android init 0.8\n");
85 fprintf(&*fp, "title = Boot chart for Android (%s)\n", date);
86 fprintf(&*fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
87 fprintf(&*fp, "system.release = %s\n", fingerprint.c_str());
88 // TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
89 fprintf(&*fp, "system.cpu = %s\n", uts.machine);
90 fprintf(&*fp, "system.kernel.options = %s\n", kernel_cmdline.c_str());
91 }
92
log_uptime(FILE * log)93 static void log_uptime(FILE* log) {
94 fprintf(log, "%lld\n", get_uptime_jiffies());
95 }
96
log_file(FILE * log,const char * procfile)97 static void log_file(FILE* log, const char* procfile) {
98 log_uptime(log);
99
100 std::string content;
101 if (android::base::ReadFileToString(procfile, &content)) {
102 fprintf(log, "%s\n", content.c_str());
103 }
104 }
105
log_processes(FILE * log)106 static void log_processes(FILE* log) {
107 log_uptime(log);
108
109 std::unique_ptr<DIR, int(*)(DIR*)> dir(opendir("/proc"), closedir);
110 struct dirent* entry;
111 while ((entry = readdir(dir.get())) != NULL) {
112 // Only match numeric values.
113 int pid = atoi(entry->d_name);
114 if (pid == 0) continue;
115
116 // /proc/<pid>/stat only has truncated task names, so get the full
117 // name from /proc/<pid>/cmdline.
118 std::string cmdline;
119 android::base::ReadFileToString(StringPrintf("/proc/%d/cmdline", pid), &cmdline);
120 const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
121
122 // Read process stat line.
123 std::string stat;
124 if (android::base::ReadFileToString(StringPrintf("/proc/%d/stat", pid), &stat)) {
125 if (!cmdline.empty()) {
126 // Substitute the process name with its real name.
127 size_t open = stat.find('(');
128 size_t close = stat.find_last_of(')');
129 if (open != std::string::npos && close != std::string::npos) {
130 stat.replace(open + 1, close - open - 1, full_name);
131 }
132 }
133 fputs(stat.c_str(), log);
134 }
135 }
136
137 fputc('\n', log);
138 }
139
bootchart_thread_main()140 static void bootchart_thread_main() {
141 LOG(INFO) << "Bootcharting started";
142
143 // Open log files.
144 auto stat_log = fopen_unique("/data/bootchart/proc_stat.log", "we");
145 if (!stat_log) return;
146 auto proc_log = fopen_unique("/data/bootchart/proc_ps.log", "we");
147 if (!proc_log) return;
148 auto disk_log = fopen_unique("/data/bootchart/proc_diskstats.log", "we");
149 if (!disk_log) return;
150
151 log_header();
152
153 while (true) {
154 {
155 std::unique_lock<std::mutex> lock(g_bootcharting_finished_mutex);
156 g_bootcharting_finished_cv.wait_for(lock, 200ms);
157 if (g_bootcharting_finished) break;
158 }
159
160 log_file(&*stat_log, "/proc/stat");
161 log_file(&*disk_log, "/proc/diskstats");
162 log_processes(&*proc_log);
163 }
164
165 LOG(INFO) << "Bootcharting finished";
166 }
167
do_bootchart_start()168 static Result<void> do_bootchart_start() {
169 // We don't care about the content, but we do care that /data/bootchart/enabled actually exists.
170 std::string start;
171 if (!android::base::ReadFileToString("/data/bootchart/enabled", &start)) {
172 LOG(VERBOSE) << "Not bootcharting";
173 return {};
174 }
175
176 g_bootcharting_thread = new std::thread(bootchart_thread_main);
177 return {};
178 }
179
do_bootchart_stop()180 static Result<void> do_bootchart_stop() {
181 if (!g_bootcharting_thread) return {};
182
183 // Tell the worker thread it's time to quit.
184 {
185 std::lock_guard<std::mutex> lock(g_bootcharting_finished_mutex);
186 g_bootcharting_finished = true;
187 g_bootcharting_finished_cv.notify_one();
188 }
189
190 g_bootcharting_thread->join();
191 delete g_bootcharting_thread;
192 g_bootcharting_thread = nullptr;
193 return {};
194 }
195
do_bootchart(const BuiltinArguments & args)196 Result<void> do_bootchart(const BuiltinArguments& args) {
197 if (args[1] == "start") return do_bootchart_start();
198 return do_bootchart_stop();
199 }
200
201 } // namespace init
202 } // namespace android
203