upload android base code part6

android/system/core/init/bootchart.cpp

@@ -0,0 +1,200 @@
+/*
+ * 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 int 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 0;
+  }
+
+  g_bootcharting_thread = new std::thread(bootchart_thread_main);
+  return 0;
+}
+
+static int do_bootchart_stop() {
+  if (!g_bootcharting_thread) return 0;
+
+  // 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 0;
+}
+
+int do_bootchart(const std::vector<std::string>& args) {
+  if (args[1] == "start") return do_bootchart_start();
+  return do_bootchart_stop();
+}
+
+}  // namespace init
+}  // namespace android