minix/commands/profile/profile.c

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/* profile - profile operating system
*
* The profile command is used to control Statistical and Call Profiling.
* It writes the profiling data collected by the kernel to a file.
*
* Changes:
* 14 Aug, 2006 Created (Rogier Meurs)
*/
#define SPROFILE 1
#define CPROFILE 1
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <minix/profile.h>
#define EHELP 1
#define ESYNTAX 2
#define EMEM 3
#define EOUTFILE 4
#define EFREQ 5
#define EACTION 6
#define START 1
#define STOP 2
#define GET 3
#define RESET 4
#define SPROF (action==START||action==STOP)
#define CPROF (!SPROF)
#define DEF_OUTFILE_S "profile.stat.out"
#define DEF_OUTFILE_C "profile.call.out"
#define DEF_OUTFILE (SPROF?DEF_OUTFILE_S:DEF_OUTFILE_C)
#define NPIPE "/tmp/profile.npipe"
#define MIN_MEMSIZE 1
#define DEF_MEMSIZE 64
#define MIN_FREQ 3
#define MAX_FREQ 15
#define DEF_FREQ 6
#define BUFSIZE 1024
#define MB (1024*1024)
#define SYNCING "SYNC"
#define DEV_LOG "/dev/log"
int action = 0;
int mem_size = 0;
int mem_used = 0;
int freq = 0;
char *outfile = "";
char *mem_ptr;
int outfile_fd, npipe_fd;
struct sprof_info_s sprof_info;
struct cprof_info_s cprof_info;
_PROTOTYPE(int handle_args, (int argc, char *argv[]));
_PROTOTYPE(int start, (void));
_PROTOTYPE(int stop, (void));
_PROTOTYPE(int get, (void));
_PROTOTYPE(int reset, (void));
_PROTOTYPE(int create_named_pipe, (void));
_PROTOTYPE(int alloc_mem, (void));
_PROTOTYPE(int init_outfile, (void));
_PROTOTYPE(int write_outfile, (void));
_PROTOTYPE(int detach, (void));
int main(int argc, char *argv[])
{
int res;
if (res = handle_args(argc, argv)) {
switch(res) {
case ESYNTAX:
printf("Error in parameters.\n");
return 1;
break;
case EACTION:
printf("Specify one of start|stop|get|reset.\n");
return 1;
break;
case EMEM:
printf("Incorrect memory size.\n");
return 1;
break;
case EFREQ:
printf("Incorrect frequency.\n");
return 1;
break;
case EOUTFILE:
printf("Output filename missing.\n");
return 1;
break;
default:
break;
}
printf("Statistical Profiling:\n");
printf(" profile start [-m memsize] [-o outfile] [-f frequency]\n");
printf(" profile stop\n\n");
printf("Call Profiling:\n");
printf(" profile get [-m memsize] [-o outfile]\n");
printf(" profile reset\n\n");
printf(" - memsize in MB, default: %u\n", DEF_MEMSIZE);
printf(" - default output file: profile.{stat|call}.out\n");
printf( " - sample frequencies (default: %u):\n", DEF_FREQ);
printf(" 3 8192 Hz 10 64 Hz\n");
printf(" 4 4096 Hz 11 32 Hz\n");
printf(" 5 2048 Hz 12 16 Hz\n");
printf(" 6 1024 Hz 13 8 Hz\n");
printf(" 7 512 Hz 14 4 Hz\n");
printf(" 8 256 Hz 15 2 Hz\n");
printf(" 9 128 Hz\n\n");
printf("Use [sc]profalyze.pl to analyze output file.\n");
return 1;
}
switch(action) {
case START:
if (start()) return 1;
break;
case STOP:
if (stop()) return 1;
break;
case GET:
if (get()) return 1;
break;
case RESET:
if (reset()) return 1;
break;
default:
break;
}
return 0;
}
int handle_args(int argc, char *argv[])
{
while (--argc) {
++argv;
if (strcmp(*argv, "-h") == 0 || strcmp(*argv, "help") == 0 ||
strcmp(*argv, "--help") == 0) {
return EHELP;
} else
if (strcmp(*argv, "-m") == 0) {
if (--argc == 0) return ESYNTAX;
if (sscanf(*++argv, "%u", &mem_size) != 1 ||
mem_size < MIN_MEMSIZE ) return EMEM;
} else
if (strcmp(*argv, "-f") == 0) {
if (--argc == 0) return ESYNTAX;
if (sscanf(*++argv, "%u", &freq) != 1 ||
freq < MIN_FREQ || freq > MAX_FREQ) return EFREQ;
} else
if (strcmp(*argv, "-o") == 0) {
if (--argc == 0) return ESYNTAX;
outfile = *++argv;
} else
if (strcmp(*argv, "start") == 0) {
if (action) return EACTION;
action = START;
} else
if (strcmp(*argv, "stop") == 0) {
if (action) return EACTION;
action = STOP;
} else
if (strcmp(*argv, "get") == 0) {
if (action) return EACTION;
action = GET;
} else
if (strcmp(*argv, "reset") == 0) {
if (action) return EACTION;
action = RESET;
}
}
/* No action specified. */
if (!action) return EHELP;
/* Init unspecified parameters. */
if (action == START || action == GET) {
if (strcmp(outfile, "") == 0) outfile = DEF_OUTFILE;
if (mem_size == 0) mem_size = DEF_MEMSIZE;
mem_size *= MB; /* mem_size in bytes */
}
if (action == START) {
mem_size -= mem_size % sizeof(sprof_sample); /* align to sample size */
if (freq == 0) freq = DEF_FREQ; /* default frequency */
}
return 0;
}
int start()
{
/* This is the "starter process" for statistical profiling.
*
* Create output file for profiling data. Create named pipe to
* synchronize with stopper process. Fork so the parent can exit.
* Allocate memory for profiling data. Start profiling in kernel.
* Complete detachment from terminal. Write known string to named
* pipe, which blocks until read by stopper process. Redirect
* stdout/stderr to the named pipe. Write profiling data to file.
* Clean up.
*/
int log_fd;
if (init_outfile() || create_named_pipe()) return 1;
printf("Starting statistical profiling.\n");
if (fork() != 0) exit(0);
if (alloc_mem()) return 1;
if (sprofile(PROF_START, mem_size, freq, &sprof_info, mem_ptr)) {
perror("sprofile");
printf("Error starting profiling.\n");
return 1;
}
detach();
/* Temporarily redirect to system log to catch errors. */
log_fd = open(DEV_LOG, O_WRONLY);
dup2(log_fd, 1);
dup2(log_fd, 2);
if ((npipe_fd = open(NPIPE, O_WRONLY)) < 0) {
printf("Unable to open named pipe %s.\n", NPIPE);
return 1;
} else
/* Synchronize with stopper process. */
write(npipe_fd, SYNCING, strlen(SYNCING));
/* Now redirect to named pipe. */
dup2(npipe_fd, 1);
dup2(npipe_fd, 2);
mem_used = sprof_info.mem_used;
if (mem_used == -1) {
printf("WARNING: Profiling was stopped prematurely due to ");
printf("insufficient memory.\n");
printf("Try increasing available memory using the -m switch.\n");
}
if (write_outfile()) return 1;
close(log_fd);
close(npipe_fd);
unlink(NPIPE);
close(outfile_fd);
free(mem_ptr);
return 0;
}
int stop()
{
/* This is the "stopper" process for statistical profiling.
*
* Stop profiling in kernel. Read known string from named pipe
* to synchronize with starter proces. Read named pipe until EOF
* and write to stdout, this allows feedback from started process
* to be printed.
*/
int n;
char buf[BUFSIZE];
if (sprofile(PROF_STOP, 0, 0, 0, 0)) {
perror("sprofile");
printf("Error stopping profiling.\n");
return 1;
} else printf("Statistical profiling stopped.\n");
if ((npipe_fd = open(NPIPE, O_RDONLY)) < 0) {
printf("Unable to open named pipe %s.\n", NPIPE);
return 1;
} else
/* Synchronize with starter process. */
read(npipe_fd, buf, strlen(SYNCING));
while ((n = read(npipe_fd, buf, BUFSIZE)) > 0)
write(1, buf, n);
close(npipe_fd);
return 0;
}
int get()
{
/* Get function for call profiling.
*
* Create output file. Allocate memory. Perform system call to get
* profiling table and write it to file. Clean up.
*/
if (init_outfile()) return 1;
printf("Getting call profiling data.\n");
if (alloc_mem()) return 1;
if (cprofile(PROF_GET, mem_size, &cprof_info, mem_ptr)) {
perror("cprofile");
printf("Error getting data.\n");
return 1;
}
mem_used = cprof_info.mem_used;
if (mem_used == -1) {
printf("ERROR: unable to get data due to insufficient memory.\n");
printf("Try increasing available memory using the -m switch.\n");
} else
if (cprof_info.err) {
printf("ERROR: the following error(s) happened during profiling:\n");
if (cprof_info.err & CPROF_CPATH_OVERRUN)
printf(" call path overrun\n");
if (cprof_info.err & CPROF_STACK_OVERRUN)
printf(" call stack overrun\n");
if (cprof_info.err & CPROF_TABLE_OVERRUN)
printf(" hash table overrun\n");
printf("Try changing values in /usr/src/include/minix/profile.h ");
printf("and then rebuild the system.\n");
} else
if (write_outfile()) return 1;
close(outfile_fd);
free(mem_ptr);
return 0;
}
int reset()
{
/* Reset function for call profiling.
*
* Perform system call to reset profiling table.
*/
printf("Resetting call profiling data.\n");
if (cprofile(PROF_RESET, 0, 0, 0)) {
perror("cprofile");
printf("Error resetting data.\n");
return 1;
}
return 0;
}
int alloc_mem()
{
if ((mem_ptr = malloc(mem_size)) == 0) {
printf("Unable to allocate memory.\n");
printf("Used chmem to increase available proces memory?\n");
return 1;
} else memset(mem_ptr, '\0', mem_size);
return 0;
}
int init_outfile()
{
if ((outfile_fd = open(outfile, O_CREAT | O_TRUNC | O_WRONLY)) <= 0) {
printf("Unable to create outfile %s.\n", outfile);
return 1;
} else chmod(outfile, S_IRUSR | S_IWUSR);
return 0;
}
int create_named_pipe()
{
if ((mkfifo(NPIPE, S_IRUSR | S_IWUSR) == -1) && (errno != EEXIST)) {
printf("Unable to create named pipe %s.\n", NPIPE);
return 1;
} else
return 0;
}
int detach()
{
setsid();
(void) chdir("/");
close(0);
close(1);
close(2);
}
int write_outfile()
{
int n, towrite, written = 0;
char *buf = mem_ptr;
char header[80];
printf("Writing to %s ...", outfile);
/* Write header. */
if (SPROF)
sprintf(header, "stat\n%d %d %d %d\n", sprof_info.total_samples,
sprof_info.idle_samples,
sprof_info.system_samples,
sprof_info.user_samples);
else
sprintf(header, "call\n%u %u\n",
CPROF_CPATH_MAX_LEN, CPROF_PROCNAME_LEN);
n = write(outfile_fd, header, strlen(header));
if (n < 0) { printf("Error writing to outfile %s.\n", outfile); return 1; }
/* Write data. */
towrite = mem_used == -1 ? mem_size : mem_used;
while (towrite > 0) {
n = write(outfile_fd, buf, towrite);
if (n < 0)
{ printf("Error writing to outfile %s.\n", outfile); return 1; }
towrite -= n;
buf += n;
written += n;
}
printf(" header %d bytes, data %d bytes.\n", strlen(header), written);
return 0;
}