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