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platform_system_core
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platform_system_core/init/bootchart.cpp

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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 "log.h"
#include "property_service.h"
#include <dirent.h>
#include <errno.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 <memory>
#include <string>
#include <vector>
#include <android-base/file.h>
#define LOG_ROOT "/data/bootchart"
#define LOG_STAT LOG_ROOT"/proc_stat.log"
#define LOG_PROCS LOG_ROOT"/proc_ps.log"
#define LOG_DISK LOG_ROOT"/proc_diskstats.log"
#define LOG_HEADER LOG_ROOT"/header"
#define LOG_ACCT LOG_ROOT"/kernel_pacct"
#define LOG_STARTFILE LOG_ROOT"/start"
#define LOG_STOPFILE LOG_ROOT"/stop"
// Polling period in ms.
static const int BOOTCHART_POLLING_MS = 200;
// Max polling time in seconds.
static const int BOOTCHART_MAX_TIME_SEC = 10*60;
static long long g_last_bootchart_time;
static int g_remaining_samples;
static FILE* log_stat;
static FILE* log_procs;
static FILE* log_disks;
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 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 = property_get("ro.build.fingerprint");
if (fingerprint.empty()) {
return;
}
std::string kernel_cmdline;
android::base::ReadFileToString("/proc/cmdline", &kernel_cmdline);
FILE* out = fopen(LOG_HEADER, "we");
if (out == NULL) {
return;
}
fprintf(out, "version = Android init 0.8\n");
fprintf(out, "title = Boot chart for Android (%s)\n", date);
fprintf(out, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, uts.version, uts.machine);
fprintf(out, "system.release = %s\n", fingerprint.c_str());
// TODO: use /proc/cpuinfo "model name" line for x86, "Processor" line for arm.
fprintf(out, "system.cpu = %s\n", uts.machine);
fprintf(out, "system.kernel.options = %s\n", kernel_cmdline.c_str());
fclose(out);
}
static void do_log_uptime(FILE* log) {
fprintf(log, "%lld\n", get_uptime_jiffies());
}
static void do_log_file(FILE* log, const char* procfile) {
do_log_uptime(log);
std::string content;
if (android::base::ReadFileToString(procfile, &content)) {
fprintf(log, "%s\n", content.c_str());
}
}
static void do_log_procs(FILE* log) {
do_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.
char* end;
int pid = strtol(entry->d_name, &end, 10);
if (end != NULL && end > entry->d_name && *end == 0) {
char filename[32];
// /proc/<pid>/stat only has truncated task names, so get the full
// name from /proc/<pid>/cmdline.
snprintf(filename, sizeof(filename), "/proc/%d/cmdline", pid);
std::string cmdline;
android::base::ReadFileToString(filename, &cmdline);
const char* full_name = cmdline.c_str(); // So we stop at the first NUL.
// Read process stat line.
snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
std::string stat;
if (android::base::ReadFileToString(filename, &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 int bootchart_init() {
int timeout = 0;
std::string start;
android::base::ReadFileToString(LOG_STARTFILE, &start);
if (!start.empty()) {
timeout = atoi(start.c_str());
} else {
// When running with emulator, androidboot.bootchart=<timeout>
// might be passed by as kernel parameters to specify the bootchart
// timeout. this is useful when using -wipe-data since the /data
// partition is fresh.
std::string cmdline;
const char* s;
android::base::ReadFileToString("/proc/cmdline", &cmdline);
#define KERNEL_OPTION "androidboot.bootchart="
if ((s = strstr(cmdline.c_str(), KERNEL_OPTION)) != NULL) {
timeout = atoi(s + sizeof(KERNEL_OPTION) - 1);
}
}
if (timeout == 0)
return 0;
if (timeout > BOOTCHART_MAX_TIME_SEC)
timeout = BOOTCHART_MAX_TIME_SEC;
int count = (timeout*1000 + BOOTCHART_POLLING_MS-1)/BOOTCHART_POLLING_MS;
log_stat = fopen(LOG_STAT, "we");
if (log_stat == NULL) {
return -1;
}
log_procs = fopen(LOG_PROCS, "we");
if (log_procs == NULL) {
fclose(log_stat);
return -1;
}
log_disks = fopen(LOG_DISK, "we");
if (log_disks == NULL) {
fclose(log_stat);
fclose(log_procs);
return -1;
}
// Create kernel process accounting file.
close(open(LOG_ACCT, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0644));
acct(LOG_ACCT);
log_header();
return count;
}
int do_bootchart_init(const std::vector<std::string>& args) {
g_remaining_samples = bootchart_init();
if (g_remaining_samples < 0) {
PLOG(ERROR) << "Bootcharting initialization failed";
} else if (g_remaining_samples > 0) {
LOG(INFO) << "Bootcharting started (will run for "
<< ((g_remaining_samples * BOOTCHART_POLLING_MS) / 1000) << " s).";
} else {
LOG(VERBOSE) << "Not bootcharting.";
}
return 0;
}
static int bootchart_step() {
do_log_file(log_stat, "/proc/stat");
do_log_file(log_disks, "/proc/diskstats");
do_log_procs(log_procs);
// Stop if /data/bootchart/stop contains 1.
std::string stop;
if (android::base::ReadFileToString(LOG_STOPFILE, &stop) && stop == "1") {
return -1;
}
return 0;
}
/* called to get time (in ms) used by bootchart */
static long long bootchart_gettime() {
return 10LL*get_uptime_jiffies();
}
static void bootchart_finish() {
unlink(LOG_STOPFILE);
fclose(log_stat);
fclose(log_disks);
fclose(log_procs);
acct(NULL);
}
void bootchart_sample(int* timeout) {
// Do we have any more bootcharting to do?
if (g_remaining_samples <= 0) {
return;
}
long long current_time = bootchart_gettime();
int elapsed_time = current_time - g_last_bootchart_time;
if (elapsed_time >= BOOTCHART_POLLING_MS) {
/* count missed samples */
while (elapsed_time >= BOOTCHART_POLLING_MS) {
elapsed_time -= BOOTCHART_POLLING_MS;
g_remaining_samples--;
}
/* count may be negative, take a sample anyway */
g_last_bootchart_time = current_time;
if (bootchart_step() < 0 || g_remaining_samples <= 0) {
bootchart_finish();
g_remaining_samples = 0;
}
}
if (g_remaining_samples > 0) {
int remaining_time = BOOTCHART_POLLING_MS - elapsed_time;
if (*timeout < 0 || *timeout > remaining_time) {
*timeout = remaining_time;
}
}
}
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