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platform_system_core
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platform_system_core/init/bootchart.c

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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.
*/
/* this code is used to generate a boot sequence profile that can be used
* with the 'bootchart' graphics generation tool. see www.bootchart.org
* note that unlike the original bootchartd, this is not a Bash script but
* some C code that is run right from the init script.
*/
#include <stdio.h>
#include <time.h>
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "bootchart.h"
#define VERSION "0.8"
#define SAMPLE_PERIOD 0.2
#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 "/data/bootchart-start"
#define LOG_STOPFILE "/data/bootchart-stop"
static int
unix_read(int fd, void* buff, int len)
{
int ret;
do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR);
return ret;
}
static int
unix_write(int fd, const void* buff, int len)
{
int ret;
do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR);
return ret;
}
static int
proc_read(const char* filename, char* buff, size_t buffsize)
{
int len = 0;
int fd = open(filename, O_RDONLY);
if (fd >= 0) {
len = unix_read(fd, buff, buffsize-1);
close(fd);
}
buff[len > 0 ? len : 0] = 0;
return len;
}
#define FILE_BUFF_SIZE 65536
typedef struct {
int count;
int fd;
char data[FILE_BUFF_SIZE];
} FileBuffRec, *FileBuff;
static void
file_buff_open( FileBuff buff, const char* path )
{
buff->count = 0;
buff->fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0755);
}
static void
file_buff_write( FileBuff buff, const void* src, int len )
{
while (len > 0) {
int avail = sizeof(buff->data) - buff->count;
if (avail > len)
avail = len;
memcpy( buff->data + buff->count, src, avail );
len -= avail;
src = (char*)src + avail;
buff->count += avail;
if (buff->count == FILE_BUFF_SIZE) {
unix_write( buff->fd, buff->data, buff->count );
buff->count = 0;
}
}
}
static void
file_buff_done( FileBuff buff )
{
if (buff->count > 0) {
unix_write( buff->fd, buff->data, buff->count );
buff->count = 0;
}
}
static long long
get_uptime_jiffies()
{
char buff[64];
long long jiffies = 0;
if (proc_read("/proc/uptime", buff, sizeof(buff)) > 0)
jiffies = 100LL*strtod(buff,NULL);
return jiffies;
}
static void
log_header(void)
{
FILE* out;
char cmdline[1024];
char uname[128];
char cpuinfo[128];
char* cpu;
char date[32];
time_t now_t = time(NULL);
struct tm now = *localtime(&now_t);
strftime(date, sizeof(date), "%x %X", &now);
out = fopen( LOG_HEADER, "w" );
if (out == NULL)
return;
proc_read("/proc/cmdline", cmdline, sizeof(cmdline));
proc_read("/proc/version", uname, sizeof(uname));
proc_read("/proc/cpuinfo", cpuinfo, sizeof(cpuinfo));
cpu = strchr( cpuinfo, ':' );
if (cpu) {
char* p = strchr(cpu, '\n');
cpu += 2;
if (p)
*p = 0;
}
fprintf(out, "version = %s\n", VERSION);
fprintf(out, "title = Boot chart for Android ( %s )\n", date);
fprintf(out, "system.uname = %s\n", uname);
fprintf(out, "system.release = 0.0\n");
fprintf(out, "system.cpu = %s\n", cpu);
fprintf(out, "system.kernel.options = %s\n", cmdline);
fclose(out);
}
static void
close_on_exec(int fd)
{
fcntl(fd, F_SETFD, FD_CLOEXEC);
}
static void
open_log_file(int* plogfd, const char* logfile)
{
int logfd = *plogfd;
/* create log file if needed */
if (logfd < 0)
{
logfd = open(logfile,O_WRONLY|O_CREAT|O_TRUNC,0755);
if (logfd < 0) {
*plogfd = -2;
return;
}
close_on_exec(logfd);
*plogfd = logfd;
}
}
static void
do_log_uptime(FileBuff log)
{
char buff[65];
int len;
snprintf(buff,sizeof(buff),"%lld\n",get_uptime_jiffies());
len = strlen(buff);
file_buff_write(log, buff, len);
}
static void
do_log_ln(FileBuff log)
{
file_buff_write(log, "\n", 1);
}
static void
do_log_file(FileBuff log, const char* procfile)
{
char buff[1024];
int fd;
do_log_uptime(log);
/* append file content */
fd = open(procfile,O_RDONLY);
if (fd >= 0) {
close_on_exec(fd);
for (;;) {
int ret;
ret = unix_read(fd, buff, sizeof(buff));
if (ret <= 0)
break;
file_buff_write(log, buff, ret);
if (ret < (int)sizeof(buff))
break;
}
close(fd);
}
do_log_ln(log);
}
static void
do_log_procs(FileBuff log)
{
DIR* dir = opendir("/proc");
struct dirent* entry;
do_log_uptime(log);
while ((entry = readdir(dir)) != 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];
char buff[1024];
char cmdline[1024];
int len;
int fd;
/* read command line and extract program name */
snprintf(filename,sizeof(filename),"/proc/%d/cmdline",pid);
proc_read(filename, cmdline, sizeof(cmdline));
/* read process stat line */
snprintf(filename,sizeof(filename),"/proc/%d/stat",pid);
fd = open(filename,O_RDONLY);
if (fd >= 0) {
len = unix_read(fd, buff, sizeof(buff)-1);
close(fd);
if (len > 0) {
int len2 = strlen(cmdline);
if (len2 > 0) {
/* we want to substitute the process name with its real name */
const char* p1;
const char* p2;
buff[len] = 0;
p1 = strchr(buff, '(');
p2 = strchr(p1, ')');
file_buff_write(log, buff, p1+1-buff);
file_buff_write(log, cmdline, strlen(cmdline));
file_buff_write(log, p2, strlen(p2));
} else {
/* no substitution */
file_buff_write(log,buff,len);
}
}
}
}
}
closedir(dir);
do_log_ln(log);
}
static FileBuffRec log_stat[1];
static FileBuffRec log_procs[1];
static FileBuffRec log_disks[1];
/* called to setup bootcharting */
int bootchart_init( void )
{
int ret;
char buff[4];
int timeout = 0, count = 0;
buff[0] = 0;
proc_read( LOG_STARTFILE, buff, sizeof(buff) );
if (buff[0] != 0) {
timeout = atoi(buff);
}
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
*/
char cmdline[1024];
char* s;
#define KERNEL_OPTION "androidboot.bootchart="
proc_read( "/proc/cmdline", cmdline, sizeof(cmdline) );
s = strstr(cmdline, KERNEL_OPTION);
if (s) {
s += sizeof(KERNEL_OPTION)-1;
timeout = atoi(s);
}
}
if (timeout == 0)
return 0;
if (timeout > BOOTCHART_MAX_TIME_SEC)
timeout = BOOTCHART_MAX_TIME_SEC;
count = (timeout*1000 + BOOTCHART_POLLING_MS-1)/BOOTCHART_POLLING_MS;
do {ret=mkdir(LOG_ROOT,0755);}while (ret < 0 && errno == EINTR);
file_buff_open(log_stat, LOG_STAT);
file_buff_open(log_procs, LOG_PROCS);
file_buff_open(log_disks, LOG_DISK);
/* create kernel process accounting file */
{
int fd = open( LOG_ACCT, O_WRONLY|O_CREAT|O_TRUNC,0644);
if (fd >= 0) {
close(fd);
acct( LOG_ACCT );
}
}
log_header();
return count;
}
/* called each time you want to perform a bootchart sampling op */
int bootchart_step( void )
{
do_log_file(log_stat, "/proc/stat");
do_log_file(log_disks, "/proc/diskstats");
do_log_procs(log_procs);
/* we stop when /data/bootchart-stop contains 1 */
{
char buff[2];
if (proc_read(LOG_STOPFILE,buff,sizeof(buff)) > 0 && buff[0] == '1') {
return -1;
}
}
return 0;
}
void bootchart_finish( void )
{
unlink( LOG_STOPFILE );
file_buff_done(log_stat);
file_buff_done(log_disks);
file_buff_done(log_procs);
acct(NULL);
}
/* called to get time (in ms) used by bootchart */
long long bootchart_gettime( void )
{
return 10LL*get_uptime_jiffies();
}
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