Esempio n. 1
0
pfm_instance::pfm_instance()
{
	int ret = pfm_initialize();
        if (ret != PFM_SUCCESS)
                errx(1, "cannot initialize library: %s", pfm_strerror(ret));
	return;
}
Esempio n. 2
0
void perfevent_initialize(char*events) {
  int i, ret;
  perfevent_events = strdup(events);

  /*
   * Initialize pfm library (required before we can use it)
   */
  ret = pfm_initialize();
  if (ret != PFM_SUCCESS)
    errx(1, "Cannot initialize library: %s", pfm_strerror(ret));

  ret = perf_setup_list_events(events, &perfevent_fds, &perfevent_num_fds);
  if (ret || !perfevent_num_fds)
    errx(1, "cannot setup events");

  perfevent_fds[0].fd = -1;
  for(i=0; i < perfevent_num_fds; i++) {
    /* request timing information necessary for scaling */
    perfevent_fds[i].hw.read_format = PERF_FORMAT_SCALE;

    perfevent_fds[i].hw.disabled = (i == 0); /* do not start now */
    perfevent_fds[i].hw.inherit = 1; /* pass on to child threads */

    /* each event is in an independent group (multiplexing likely) */
    perfevent_fds[i].fd = perf_event_open(&perfevent_fds[i].hw, 0, -1, perfevent_fds[0].fd, 0);
    if (perfevent_fds[i].fd == -1)
      err(1, "cannot open event %d", i);
  }
}
Esempio n. 3
0
int perf_event_open_pfm(const char *str,
                        int group_fd)
{
    struct perf_event_attr attr;
    pfm_perf_encode_arg_t arg;

    // Clear
    memset(&attr, 0, sizeof(attr));
    attr.size = sizeof(attr);
    memset(&arg, 0, sizeof(arg));
    arg.size = sizeof(arg);
    arg.attr = &attr;

    // Use pfm to populate "attr"
    if (!pfm_initialized) {
        if (pfm_initialize() != PFM_SUCCESS)
            return -2;
        pfm_initialized = 1;
    }
    if (pfm_get_os_event_encoding(str, PFM_PLM0 | PFM_PLM3, PFM_OS_PERF_EVENT, &arg)
          != PFM_SUCCESS)
        return -2;

#ifdef LOG_PFM_DECODE
    printf("PFM decode %s = %lx %lx %lx %lx\n", str,
           attr.type, attr.config, attr.config1, attr.config2);
#endif

    // Generate event
    return perf_event_open_gen(&attr, group_fd);
}
int
main(int argc, char **argv)
{
	pfmlib_options_t pfmlib_options;
	unsigned long delay;
	pid_t pid;
	int ret;

	if (argc < 2)
		fatal_error("usage: %s pid [timeout]\n", argv[0]);

	pid   = atoi(argv[1]);
	delay = argc > 2 ? strtoul(argv[2], NULL, 10) : 10;

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
	pfm_set_options(&pfmlib_options);

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	ret = pfm_initialize();
	if (ret != PFMLIB_SUCCESS)
		fatal_error("Cannot initialize library: %s\n", pfm_strerror(ret));

	return parent(pid, delay);
}
Esempio n. 5
0
int
main(int argc, char **argv)
{
	pfmlib_options_t pfmlib_options;

	if (argc < 2)
		fatal_error("You must specify a command to execute\n");

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		fatal_error("Can't initialize library\n");
	}

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug   = 0; /* set to 1 for debug */
	pfmlib_options.pfm_verbose = 0; /* set to 1 for verbose */
	pfm_set_options(&pfmlib_options);

	return mainloop(argv+1);
}
Esempio n. 6
0
int
measure(pid_t pid)
{
	perf_event_desc_t *fds = NULL;
	int i, ret, num_fds = 0;
	char fn[32];

	if (pfm_initialize() != PFM_SUCCESS)
		errx(1, "libpfm initialization failed\n");

	ret = perf_setup_list_events(options.events, &fds, &num_fds);
	if (ret || (num_fds == 0))
		exit(1);

	fds[0].fd = -1;
	for(i=0; i < num_fds; i++) {
		fds[i].hw.disabled = 0; /* start immediately */

		/* request timing information necessary for scaling counts */
		fds[i].hw.read_format = PERF_FORMAT_SCALE;
		fds[i].hw.pinned = !i && options.pinned;
		fds[i].fd = perf_event_open(&fds[i].hw, pid, -1, (options.group? fds[0].fd : -1), 0);
		if (fds[i].fd == -1)
			errx(1, "cannot attach event %s", fds[i].name);
	}
	/*
	 * no notification is generated by perf_counters
	 * when the monitored thread exits. Thus we need
	 * to poll /proc/ to detect it has disappeared,
	 * otherwise we have to wait until the end of the
	 * timeout
	 */
	sprintf(fn, "/proc/%d/status", pid);

	while(access(fn, F_OK) == 0 && options.delay) {
		sleep(1);
		options.delay--;
		if (options.print)
			print_counts(fds, num_fds, 1);
	}
	if (options.delay)
		warn("thread %d terminated before timeout", pid);

	if (!options.print)
		print_counts(fds, num_fds, 0);

	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	free(fds);

	/* free libpfm resources cleanly */
	pfm_terminate();

	return 0;
}
Esempio n. 7
0
void perf_init() {
  static int init = 0;
 
  if (init) return;
  init = 1;

  char* prof_envvar = getenv("MXPA_PROFILE");
  if (prof_envvar) {
    enabled = 1;
  } else {
    return;
  }

  pfm_initialize();
}
void perfctr_init() {
  int i;
  if (!initialized) {
    char *buf = malloc(64);
    printf("Initializing performance counters\n");
    printf("Stack address %p, heap %p\n", &buf, buf);
    free(buf);
    get_events();
    /*
     * Initialize libpfm library (required before we can use it)
     */
    int ret = pfm_initialize();
    if (ret != PFM_SUCCESS) errx(1, "cannot initialize library: %s", pfm_strerror(ret));
    for (i = 0; i < g_num_events; i++) {
      g_event_counts[i] = 0;
    }
    pthread_mutex_init(&count_lock, NULL);
    initialized = 1;
  }
}
Esempio n. 9
0
int
main(int argc, char **argv)
{
	unsigned int i, cnum = 0;
	pfarg_reg_t pc[NUM_PMCS];
	pfmlib_regmask_t impl_pmcs;
	unsigned int num_pmcs;

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		printf("Can't initialize library\n");
		exit(1);
	}

	memset(&impl_pmcs, 0, sizeof(impl_pmcs));
	memset(pc, 0, sizeof(pc));
	
	pfm_get_impl_pmcs(&impl_pmcs);
	pfm_get_num_pmcs(&num_pmcs);

	for(i=0; num_pmcs ; i++) {
		if (pfm_regmask_isset(&impl_pmcs, i) == 0) continue;
		pc[cnum++].reg_num = i;
		num_pmcs--;
	}

	if (perfmonctl(0, PFM_GET_PMC_RESET_VAL, pc, cnum) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("cannot get reset values: %s\n", strerror(errno));
	}

	for (i=0; i < cnum; i++) {
		printf("PMC%u 0x%lx\n", pc[i].reg_num, pc[i].reg_value);

	}
	return 0;
}
Esempio n. 10
0
  EXTERNAL void sysPerfEventInit(int numEvents)
  {
    int i;
    TRACE_PRINTF("%s: sysPerfEventInit\n", Me);
    int ret = pfm_initialize();
    if (ret != PFM_SUCCESS) {
      errx(1, "error in pfm_initialize: %s", pfm_strerror(ret));
    }

    perf_event_fds = (int*)checkCalloc(numEvents, sizeof(int));
    if (!perf_event_fds) {
      errx(1, "error allocating perf_event_fds");
    }
    perf_event_attrs = (struct perf_event_attr *)checkCalloc(numEvents, sizeof(struct perf_event_attr));
    if (!perf_event_attrs) {
      errx(1, "error allocating perf_event_attrs");
    }
    for(i = 0; i < numEvents; i++) {
      perf_event_attrs[i].size = sizeof(struct perf_event_attr);
    }
    enabled = 1;
  }
Esempio n. 11
0
File: lib.c Progetto: s-kanev/misc
int pfm_init_counters(const char** counters) {
#ifdef VERBOSE
    fprintf(stderr, "Initing counters\n");
#endif
    /* Initialize pfm library */
    int i,ret;

    ret = pfm_initialize();

    if (ret != PFM_SUCCESS) {
        fprintf(stderr, "Cannot initialize libpfm: %s\n", pfm_strerror(ret));
        return -1;
    }

    ret = perf_setup_argv_events(counters, &fds, &num_fds);
    if (ret || !num_fds) {
        fprintf(stderr, "Cannot setup events\n");
        return -1;
    }

    fds[0].fd = -1;
    for (i=0; i < num_fds; i++) {
        /* request timing information necessary for scaling */
        fds[i].hw.read_format = PERF_FORMAT_SCALE;
        fds[i].hw.disabled = 1; /* start paused */

        fds[i].fd = perf_event_open(&fds[i].hw, 0, -1, -1, 0);
        if (fds[i].fd == -1) {
            fprintf(stderr, "Cannot open event %d\n", i);
            return -1;
        }
    }

    counter_values = (uint64_t*) malloc(num_fds * sizeof(uint64_t));
    return 0;
}
Esempio n. 12
0
int
main(void)
{
	int ret;
	int type = 0;
	pid_t pid = getpid();
	pfmlib_ita2_param_t ita_param;
	pfarg_reg_t pd[NUM_PMDS];
	pfarg_context_t ctx[1];
	pfmlib_options_t pfmlib_options;
	struct sigaction act;

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		fatal_error("Can't initialize library\n");
	}

	/*
	 * Let's make sure we run this on the right CPU
	 */
	pfm_get_pmu_type(&type);
	if (type != PFMLIB_ITANIUM2_PMU) {
		char *model; 
		pfm_get_pmu_name(&model);
		fatal_error("this program does not work with %s PMU\n", model);
	}

	/*
	 * Install the overflow handler (SIGPROF)
	 */
	memset(&act, 0, sizeof(act));
	act.sa_handler = (sig_t)overflow_handler;
	sigaction (SIGPROF, &act, 0);


	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
	pfmlib_options.pfm_verbose = 0; /* set to 1 for debug */
	pfm_set_options(&pfmlib_options);



	memset(pd, 0, sizeof(pd));
	memset(ctx, 0, sizeof(ctx));

	/*
	 * prepare parameters to library. we don't use any Itanium
	 * specific features here. so the pfp_model is NULL.
	 */
	memset(&evt,0, sizeof(evt));
	memset(&ita_param,0, sizeof(ita_param));


	/*
	 * because we use a model specific feature, we must initialize the
	 * model specific pfmlib parameter structure and link it to the
	 * common structure.
	 * The magic number is a simple mechanism used by the library to check
	 * that the model specific data structure is decent. You must set it manually
	 * otherwise the model specific feature won't work.
	 */
	ita_param.pfp_magic = PFMLIB_ITA2_PARAM_MAGIC;
	evt.pfp_model       = &ita_param;

	/*
	 * Before calling pfm_find_dispatch(), we must specify what kind
	 * of branches we want to capture. We are interesteed in all the mispredicted branches, 
	 * therefore we program we set the various fields of the BTB config to:
	 */
	ita_param.pfp_ita2_btb.btb_used = 1;

	ita_param.pfp_ita2_btb.btb_ds  = 0;
	ita_param.pfp_ita2_btb.btb_tm  = 0x3;
	ita_param.pfp_ita2_btb.btb_ptm = 0x3;
	ita_param.pfp_ita2_btb.btb_ppm = 0x3;
	ita_param.pfp_ita2_btb.btb_brt = 0x0;
	ita_param.pfp_ita2_btb.btb_plm = PFM_PLM3;

	/*
	 * To count the number of occurence of this instruction, we must
	 * program a counting monitor with the IA64_TAGGED_INST_RETIRED_PMC8
	 * event.
	 */
	if (pfm_find_event_byname("BRANCH_EVENT", &evt.pfp_events[0].event) != PFMLIB_SUCCESS) {
		fatal_error("cannot find event BRANCH_EVENT\n");
	}

	/*
	 * set the (global) privilege mode:
	 * 	PFM_PLM3 : user level only
	 */
	evt.pfp_dfl_plm   = PFM_PLM3; 
	/*
	 * how many counters we use
	 */
	evt.pfp_event_count = 1;

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&evt)) != PFMLIB_SUCCESS) {
		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
	}
	/*
	 * for this example, we will get notified ONLY when the sampling
	 * buffer is full. The monitoring is not to be inherited
	 * in derived tasks
	 */
	ctx[0].ctx_flags        = PFM_FL_INHERIT_NONE;
	ctx[0].ctx_notify_pid   = getpid();
	ctx[0].ctx_smpl_entries = SMPL_BUF_NENTRIES;
	ctx[0].ctx_smpl_regs[0] = smpl_regs = BTB_REGS_MASK;


	/*
	 * now create the context for self monitoring/per-task
	 */
	if (perfmonctl(pid, PFM_CREATE_CONTEXT, ctx, 1) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("Can't create PFM context %s\n", strerror(errno));
	}

	printf("Sampling buffer mapped at %p\n", ctx[0].ctx_smpl_vaddr);

	smpl_vaddr = ctx[0].ctx_smpl_vaddr;

	/* 
	 * Must be done before any PMD/PMD calls (unfreeze PMU). Initialize
	 * PMC/PMD to safe values. psr.up is cleared.
	 */
	if (perfmonctl(pid, PFM_ENABLE, NULL, 0) == -1) {
		fatal_error("perfmonctl error PFM_ENABLE errno %d\n",errno);
	}

	/*
	 * indicate we want notification when buffer is full
	 */
	evt.pfp_pc[0].reg_flags |= PFM_REGFL_OVFL_NOTIFY;

	/*
	 * Now prepare the argument to initialize the PMD and the sampling period
	 */
	pd[0].reg_num         = evt.pfp_pc[0].reg_num;
	pd[0].reg_value       = (~0UL) - SMPL_PERIOD +1;
	pd[0].reg_long_reset  = (~0UL) - SMPL_PERIOD +1;
	pd[0].reg_short_reset = (~0UL) - SMPL_PERIOD +1;

	/*
	 * When our counter overflows, we want to BTB index to be reset, so that we keep
	 * in sync. This is required to make it possible to interpret pmd16 on overflow
	 * to avoid repeating the same branch several times.
	 */
	evt.pfp_pc[0].reg_reset_pmds[0] = M_PMD(16);

	/*
	 * reset pmd16, short and long reset value are set to zero as well
	 */
	pd[1].reg_num         = 16;
	pd[1].reg_value       = 0UL;

	/*
	 * Now program the registers
	 *
	 * We don't use the save variable to indicate the number of elements passed to
	 * the kernel because, as we said earlier, pc may contain more elements than
	 * the number of events we specified, i.e., contains more thann coutning monitors.
	 */
	if (perfmonctl(pid, PFM_WRITE_PMCS, evt.pfp_pc, evt.pfp_pc_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMCS errno %d\n",errno);
	}
	if (perfmonctl(pid, PFM_WRITE_PMDS, pd, 2) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}

	/*
	 * Let's roll now.
	 */

	do_test(100000);

	/*
	 * We must call the processing routine to cover the last entries recorded
	 * in the sampling buffer, i.e. which may not be full
	 */
	process_smpl_buffer();

	/* 
	 * let's stop this now
	 */
	if (perfmonctl(pid, PFM_DESTROY_CONTEXT, NULL, 0) == -1) {
		fatal_error("perfmonctl error PFM_DESTROY errno %d\n",errno);
	}
	return 0;
}
Esempio n. 13
0
static void
measure(void)
{
	perf_event_desc_t *fds = NULL;
	int num_fds = 0;
	uint64_t values[3];
	ssize_t n;
	int i, ret;
	int pr[2], pw[2];
	pid_t pid;
	char cc = '0';

	ret = pfm_initialize();
	if (ret != PFM_SUCCESS)
		err(1, "cannot initialize libpfm");

	if (options.cpu == -1) {
		srandom(getpid());
		options.cpu = random() % sysconf(_SC_NPROCESSORS_ONLN);
	}

	ret = pipe(pr);
	if (ret)
		err(1, "cannot create read pipe");

	ret = pipe(pw);
	if (ret)
		err(1, "cannot create write pipe");

	ret = perf_setup_list_events(options.events, &fds, &num_fds);
	if (ret || !num_fds)
		exit(1);

	for(i=0; i < num_fds; i++) {
		fds[i].hw.disabled = 1;
		fds[i].hw.read_format = PERF_FORMAT_SCALE;

		fds[i].fd = perf_event_open(&fds[i].hw, 0, -1, -1, 0);
		if (fds[i].fd == -1)
			err(1, "cannot open event %d", i);
	}

	/*
 	 * Pin to CPU0, inherited by child process. That will enforce
 	 * the ping-pionging and thus stress the PMU context switch 
 	 * which is what we want
 	 */
	ret = pin_cpu(getpid(), options.cpu);
	if (ret)
		err(1, "cannot pin to CPU%d", options.cpu);

	printf("Both processes pinned to CPU%d, running for %d seconds\n", options.cpu, options.delay);

	/*
 	 * create second process which is not monitoring at the moment
 	 */
	switch(pid=fork()) {
		case -1:
			err(1, "cannot create child\n");
		case 0:
			/* do not inherit session fd */
			for(i=0; i < num_fds; i++)
				close(fds[i].fd);
			/* pr[]: write master, read child */
			/* pw[]: read master, write child */
			close(pr[1]); close(pw[0]);
			do_child(pr[0], pw[1]);
			exit(1);
	}

	close(pr[0]);
	close(pw[1]);

	/*
	 * Let's roll now
	 */
	prctl(PR_TASK_PERF_EVENTS_ENABLE);
	signal(SIGALRM, sig_handler);
	alarm(options.delay);

	/*
	 * ping pong loop
	 */
	while(!quit) {
		n = write(pr[1], "c", 1);
		if (n < 1)
			err(1, "write failed");
		n = read(pw[0], &cc, 1);
		if (n < 1)
			err(1, "read failed");
	}

	prctl(PR_TASK_PERF_EVENTS_DISABLE);

	for(i=0; i < num_fds; i++) {
		uint64_t val;
		double ratio;

		ret = read(fds[i].fd, values, sizeof(values));
		if (ret == -1)
			err(1,"pfm_read error");
		if (ret != sizeof(values))
			errx(1, "did not read correct amount %d", ret);

		val = perf_scale(values);
		ratio = perf_scale_ratio(values);

		if (ratio == 1.0)
			printf("%20"PRIu64" %s\n", val, fds[i].name);
		else
			if (ratio == 0.0)
				printf("%20"PRIu64" %s (did not run: competing session)\n", val, fds[i].name);
			else
				printf("%20"PRIu64" %s (scaled from %.2f%% of time)\n", val, fds[i].name, ratio*100.0);
	}
	/*
	 * kill child process
	 */
	kill(SIGKILL, pid);

	/*
 	 * close pipes
 	 */
	close(pr[1]);
	close(pw[0]);
	/*
	 * and destroy our session
	 */
	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	perf_free_fds(fds, num_fds);

	/* free libpfm resources cleanly */
	pfm_terminate();
}
Esempio n. 14
0
int
mainloop(char **arg)
{
	static uint64_t ovfl_count; /* static to avoid setjmp issue */
	struct pollfd pollfds[1];
	sigset_t bmask;
	int go[2], ready[2];
	uint64_t *val;
	size_t sz, pgsz;
	size_t map_size = 0;
	pid_t pid;
	int status, ret;
	int i;
	char buf;

	if (pfm_initialize() != PFM_SUCCESS)
		errx(1, "libpfm initialization failed\n");

	pgsz = sysconf(_SC_PAGESIZE);
	map_size = (options.mmap_pages+1)*pgsz;

	/*
	 * does allocate fds
	 */
	ret  = perf_setup_list_events(options.events, &fds, &num_fds);
	if (ret || !num_fds)
		errx(1, "cannot setup event list");

	memset(pollfds, 0, sizeof(pollfds));

	ret = pipe(ready);
	if (ret)
		err(1, "cannot create pipe ready");

	ret = pipe(go);
	if (ret)
		err(1, "cannot create pipe go");

	/*
	 * Create the child task
	 */
	if ((pid=fork()) == -1)
		err(1, "cannot fork process\n");

	if (pid == 0) {
		close(ready[0]);
		close(go[1]);

		/*
		 * let the parent know we exist
		 */
		close(ready[1]);
		if (read(go[0], &buf, 1) == -1)
			err(1, "unable to read go_pipe");

		exit(child(arg));
	}
	close(ready[1]);
	close(go[0]);

	if (read(ready[0], &buf, 1) == -1)
		err(1, "unable to read child_ready_pipe");

	close(ready[0]);

	fds[0].fd = -1;

	if (!fds[0].hw.sample_period)
		errx(1, "need to set sampling period or freq on first event, use :period= or :freq=");

	for(i=0; i < num_fds; i++) {

		if (i == 0) {
			fds[i].hw.disabled = 1;
			fds[i].hw.enable_on_exec = 1; /* start immediately */
		} else
			fds[i].hw.disabled = 0;


		if (options.opt_inherit)
			fds[i].hw.inherit = 1;

		if (fds[i].hw.sample_period) {
			/*
			 * set notification threshold to be halfway through the buffer
			 */
			fds[i].hw.wakeup_watermark = (options.mmap_pages*pgsz) / 2;
			fds[i].hw.watermark = 1;

			fds[i].hw.sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_TID|PERF_SAMPLE_READ|PERF_SAMPLE_TIME|PERF_SAMPLE_PERIOD|PERF_SAMPLE_STREAM_ID;
			fprintf(options.output_file,"%s period=%"PRIu64" freq=%d\n", fds[i].name, fds[i].hw.sample_period, fds[i].hw.freq);

			fds[i].hw.read_format = PERF_FORMAT_SCALE;
			if (num_fds > 1)
				fds[i].hw.read_format |= PERF_FORMAT_GROUP|PERF_FORMAT_ID;

			if (fds[i].hw.freq)
				fds[i].hw.sample_type |= PERF_SAMPLE_PERIOD;
		}

		fds[i].fd = perf_event_open(&fds[i].hw, pid, options.cpu, fds[0].fd, 0);
		if (fds[i].fd == -1) {
			if (fds[i].hw.precise_ip)
				err(1, "cannot attach event %s: precise mode may not be supported", fds[i].name);
			err(1, "cannot attach event %s", fds[i].name);
		}
	}

	/*
	 * kernel adds the header page to the size of the mmapped region
	 */
	fds[0].buf = mmap(NULL, map_size, PROT_READ|PROT_WRITE, MAP_SHARED, fds[0].fd, 0);
	if (fds[0].buf == MAP_FAILED)
		err(1, "cannot mmap buffer");

	/* does not include header page */
	fds[0].pgmsk = (options.mmap_pages*pgsz)-1;

	/*
	 * send samples for all events to first event's buffer
	 */
	for (i = 1; i < num_fds; i++) {
		if (!fds[i].hw.sample_period)
			continue;
		ret = ioctl(fds[i].fd, PERF_EVENT_IOC_SET_OUTPUT, fds[0].fd);
		if (ret)
			err(1, "cannot redirect sampling output");
	}

	/*
	 * we are using PERF_FORMAT_GROUP, therefore the structure
	 * of val is as follows:
	 *
	 *      { u64           nr;
	 *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
	 *        { u64         time_running; } && PERF_FORMAT_RUNNING
	 *        { u64         value;
	 *          { u64       id;           } && PERF_FORMAT_ID
	 *        }             cntr[nr];
	 * We are skipping the first 3 values (nr, time_enabled, time_running)
	 * and then for each event we get a pair of values.
	 */
	if (num_fds > 1) {
		sz = (3+2*num_fds)*sizeof(uint64_t);
		val = malloc(sz);
		if (!val)
			err(1, "cannot allocate memory");

		ret = read(fds[0].fd, val, sz);
		if (ret == -1)
			err(1, "cannot read id %zu", sizeof(val));


		for(i=0; i < num_fds; i++) {
			fds[i].id = val[2*i+1+3];
			fprintf(options.output_file,"%"PRIu64"  %s\n", fds[i].id, fds[i].name);
		}
		free(val);
	}

	pollfds[0].fd = fds[0].fd;
	pollfds[0].events = POLLIN;
	
	for(i=0; i < num_fds; i++) {
		ret = ioctl(fds[i].fd, PERF_EVENT_IOC_ENABLE, 0);
		if (ret)
			err(1, "cannot enable event %s\n", fds[i].name);
	}
	signal(SIGCHLD, cld_handler);

	close(go[1]);

	if (setjmp(jbuf) == 1)
		goto terminate_session;

	sigemptyset(&bmask);
	sigaddset(&bmask, SIGCHLD);

	/*
	 * core loop
	 */
	for(;;) {
		ret = poll(pollfds, 1, -1);
		if (ret < 0 && errno == EINTR)
			break;
		ovfl_count++;
		ret = sigprocmask(SIG_SETMASK, &bmask, NULL);
		if (ret)
			err(1, "setmask");
		process_smpl_buf(&fds[0]);
		ret = sigprocmask(SIG_UNBLOCK, &bmask, NULL);
		if (ret)
			err(1, "unblock");
	}
terminate_session:
	/*
	 * cleanup child
	 */
	wait4(pid, &status, 0, NULL);

	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	/* check for partial event buffer */
	process_smpl_buf(&fds[0]);
	munmap(fds[0].buf, map_size);

	perf_free_fds(fds, num_fds);

	fprintf(options.output_file,
		"%"PRIu64" samples collected in %"PRIu64" poll events, %"PRIu64" lost samples\n",
		collected_samples,
		ovfl_count, lost_samples);

	/* free libpfm resources cleanly */
	pfm_terminate();

	fclose(options.output_file);

	return 0;
}
Esempio n. 15
0
int
parent(char **arg)
{
	perf_event_desc_t *fds = NULL;
	int status, ret, i, num_fds = 0, grp, group_fd;
	int ready[2], go[2];
	char buf;
	pid_t pid;

//        output_file = fopen(file_name, "w");

        //if (chroot("/home/pittdvs/cpu2006/benchspec/CPU2006/464.h264ref/run/run_base_ref_amd64-m64-gcc42-nn.0000"))
         //   err(1, "err on chroot()");

	if (pfm_initialize() != PFM_SUCCESS)
		errx(1, "libpfm initialization failed");

	for (grp = 0; grp < options.num_groups; grp++) {
		int ret;
		ret = perf_setup_list_events(options.events[grp], &fds, &num_fds);
		if (ret || !num_fds)
			exit(1);
	}

	pid = options.pid;
	if (!pid) {
		ret = pipe(ready);
		if (ret)
			err(1, "cannot create pipe ready");

		ret = pipe(go);
		if (ret)
			err(1, "cannot create pipe go");


		/*
		 * Create the child task
		 */
		if ((pid=fork()) == -1)
			err(1, "Cannot fork process");

		/*
		 * and launch the child code
		 *
		 * The pipe is used to avoid a race condition
		 * between for() and exec(). We need the pid
		 * of the new tak but we want to start measuring
		 * at the first user level instruction. Thus we
		 * need to prevent exec until we have attached
		 * the events.
		 */
		if (pid == 0) {
			close(ready[0]);
			close(go[1]);

			/*
			 * let the parent know we exist
			 */
			close(ready[1]);
			if (read(go[0], &buf, 1) == -1)
				err(1, "unable to read go_pipe");


			exit(child(arg));
		}

		close(ready[1]);
		close(go[0]);

		if (read(ready[0], &buf, 1) == -1)
			err(1, "unable to read child_ready_pipe");

		close(ready[0]);
	}

	for(i=0; i < num_fds; i++) {
		int is_group_leader; /* boolean */

		is_group_leader = perf_is_group_leader(fds, i);
		if (is_group_leader) {
			/* this is the group leader */
			group_fd = -1;
		} else {
			group_fd = fds[fds[i].group_leader].fd;
		}

		/*
		 * create leader disabled with enable_on-exec
		 */
		if (!options.pid) {
			fds[i].hw.disabled = is_group_leader;
			fds[i].hw.enable_on_exec = is_group_leader;
		}

		fds[i].hw.read_format = PERF_FORMAT_SCALE;
		/* request timing information necessary for scaling counts */
		if (is_group_leader && options.format_group)
			fds[i].hw.read_format |= PERF_FORMAT_GROUP;

		if (options.inherit)
			fds[i].hw.inherit = 1;

		if (options.pin && is_group_leader)
			fds[i].hw.pinned = 1;
		fds[i].fd = perf_event_open(&fds[i].hw, pid, -1, group_fd, 0);
		if (fds[i].fd == -1) {
			warn("cannot attach event%d %s", i, fds[i].name);
			goto error;
		}
	}

	if (!options.pid)
		close(go[1]);

	if (options.print) {
		if (!options.pid) {
			while(waitpid(pid, &status, WNOHANG) == 0 && quit == 0) {
				//sleep(1);
                                //usleep(10000);
                                msleep(100);
                                //better_sleep(0.05); // 50ms
				print_counts(fds, num_fds);
			}
		} else {
			while(quit == 0) {
				sleep(1);                                
				print_counts(fds, num_fds);
			}
		}
	} else {
		if (!options.pid)
			waitpid(pid, &status, 0);
		else
			pause();
		print_counts(fds, num_fds);
	}

	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	free(fds);

	/* free libpfm resources cleanly */
	pfm_terminate();

  //      fclose(output_file);

	return 0;
error:
	free(fds);
	if (!options.pid)
		kill(SIGKILL, pid);

	/* free libpfm resources cleanly */
	pfm_terminate();

//        fclose(output_file);

	return -1;
}
Esempio n. 16
0
// Setup the counters and populate the counters struct with their data
void pc_init(counters_t *counters, int pid)
{

#ifndef __arm__
  return;

#else
  int ret;
  ret = pfm_initialize();

  if (ret != PFM_SUCCESS) {
    errx(1, "cannot initialize library: %s", pfm_strerror(ret));
  }

  // Set values for getting cycle count
  memset(&counters->cycles.attr, 0, sizeof(counters->cycles.attr));
  memset(&counters->l1_misses.attr, 0, sizeof(counters->l1_misses.attr));
  memset(&counters->ic.attr, 0, sizeof(counters->ic.attr));

  memset(&counters->cycles.arg, 0, sizeof(counters->cycles.arg));
  memset(&counters->l1_misses.arg, 0, sizeof(counters->l1_misses.arg));
  memset(&counters->ic.arg, 0, sizeof(counters->ic.arg));

  counters->cycles.count = 0;
  counters->l1_misses.count = 0;
  counters->ic.count = 0;

  counters->cycles.arg.size = sizeof(counters->cycles.arg);
  counters->l1_misses.arg.size = sizeof(counters->l1_misses.arg);
  counters->ic.arg.size = sizeof(counters->ic.arg);

  counters->cycles.arg.attr = &counters->cycles.attr;
  counters->l1_misses.arg.attr = &counters->l1_misses.attr;
  counters->ic.arg.attr = &counters->ic.attr;

  // Get the encoding for the events
  // cycles
  ret = pfm_get_os_event_encoding("cycles", PFM_PLM0|PFM_PLM3, PFM_OS_PERF_EVENT, &counters->cycles.arg);
  if (ret != PFM_SUCCESS) {
    err(1,"Cycles: cannot get encoding %s", pfm_strerror(ret));
  }
  // l1 cache misses
  ret = pfm_get_os_event_encoding("l1-dcache-load-misses", PFM_PLM0|PFM_PLM3, PFM_OS_PERF_EVENT, &counters->l1_misses.arg);
  if (ret != PFM_SUCCESS) {
    err(1,"L1 Cache Misses:cannot get encoding %s", pfm_strerror(ret));
  }

  // instruction count misses
  ret = pfm_get_os_event_encoding("instructions", PFM_PLM0|PFM_PLM3, PFM_OS_PERF_EVENT, &counters->ic.arg);
  if (ret != PFM_SUCCESS) {
    err(1,"Instruction Count:cannot get encoding %s", pfm_strerror(ret));
  }

  // Set more options
  counters->cycles.attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
  counters->l1_misses.attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
  counters->ic.attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;

  // do not start immediately after perf_event_open()
  counters->cycles.attr.disabled = 1;
  counters->l1_misses.attr.disabled = 1;
  counters->ic.attr.disabled = 1;

  // Open the counters
  counters->cycles.fd = perf_event_open(&counters->cycles.attr, pid, -1, -1, 0);
  if (counters->cycles.fd < 0) {
    err(1, "Cycle: cannot create event");
  }

  counters->l1_misses.fd = perf_event_open(&counters->l1_misses.attr, pid, -1, -1, 0);
  if (counters->l1_misses.fd < 0) {
    err(1, "L1 miss: cannot create event");
  }

  counters->ic.fd = perf_event_open(&counters->ic.attr, pid, -1, -1, 0);
  if (counters->ic.fd < 0) {
    err(1, "Instruction count: cannot create event");
  }
  return;
#endif
}
Esempio n. 17
0
int
_papi_libpfm_init(papi_vector_t *my_vector, int cidx) {

   int retval;
   unsigned int ncnt;
   unsigned int version;
   char pmu_name[PAPI_MIN_STR_LEN];


   /* The following checks the version of the PFM library
      against the version PAPI linked to... */
   SUBDBG( "pfm_initialize()\n" );
   if ( ( retval = pfm_initialize(  ) ) != PFMLIB_SUCCESS ) {
      PAPIERROR( "pfm_initialize(): %s", pfm_strerror( retval ) );
      return PAPI_ESYS;
   }

   /* Get the libpfm3 version */
   SUBDBG( "pfm_get_version(%p)\n", &version );
   if ( pfm_get_version( &version ) != PFMLIB_SUCCESS ) {
      PAPIERROR( "pfm_get_version(%p): %s", version, pfm_strerror( retval ) );
      return PAPI_ESYS;
   }

   /* Set the version */
   sprintf( my_vector->cmp_info.support_version, "%d.%d",
	    PFM_VERSION_MAJOR( version ), PFM_VERSION_MINOR( version ) );

   /* Complain if the compiled-against version doesn't match current version */
   if ( PFM_VERSION_MAJOR( version ) != PFM_VERSION_MAJOR( PFMLIB_VERSION ) ) {
      PAPIERROR( "Version mismatch of libpfm: compiled %#x vs. installed %#x\n",
				   PFM_VERSION_MAJOR( PFMLIB_VERSION ),
				   PFM_VERSION_MAJOR( version ) );
      return PAPI_ESYS;
   }

   /* Always initialize globals dynamically to handle forks properly. */

   _perfmon2_pfm_pmu_type = -1;

   /* Opened once for all threads. */
   SUBDBG( "pfm_get_pmu_type(%p)\n", &_perfmon2_pfm_pmu_type );
   if ( pfm_get_pmu_type( &_perfmon2_pfm_pmu_type ) != PFMLIB_SUCCESS ) {
      PAPIERROR( "pfm_get_pmu_type(%p): %s", _perfmon2_pfm_pmu_type,
				   pfm_strerror( retval ) );
      return PAPI_ESYS;
   }

   pmu_name[0] = '\0';
   if ( pfm_get_pmu_name( pmu_name, PAPI_MIN_STR_LEN ) != PFMLIB_SUCCESS ) {
      PAPIERROR( "pfm_get_pmu_name(%p,%d): %s", pmu_name, PAPI_MIN_STR_LEN,
				   pfm_strerror( retval ) );
      return PAPI_ESYS;
   }
   SUBDBG( "PMU is a %s, type %d\n", pmu_name, _perfmon2_pfm_pmu_type );

   /* Setup presets */
   retval = _papi_load_preset_table( pmu_name, _perfmon2_pfm_pmu_type, cidx );
   if ( retval )
      return retval;

   /* Fill in cmp_info */

   SUBDBG( "pfm_get_num_events(%p)\n", &ncnt );
   if ( ( retval = pfm_get_num_events( &ncnt ) ) != PFMLIB_SUCCESS ) {
      PAPIERROR( "pfm_get_num_events(%p): %s\n", &ncnt,
				   pfm_strerror( retval ) );
      return PAPI_ESYS;
   }
   SUBDBG( "pfm_get_num_events: %d\n", ncnt );
   my_vector->cmp_info.num_native_events = ncnt;
   num_native_events = ncnt;

   pfm_get_num_counters( ( unsigned int * ) &my_vector->cmp_info.num_cntrs );
   SUBDBG( "pfm_get_num_counters: %d\n", my_vector->cmp_info.num_cntrs );


   if ( _papi_hwi_system_info.hw_info.vendor == PAPI_VENDOR_INTEL ) {
     /* Pentium4 */
     if ( _papi_hwi_system_info.hw_info.cpuid_family == 15 ) {
       PAPI_NATIVE_EVENT_AND_MASK = 0x000000ff;
       PAPI_NATIVE_UMASK_AND_MASK = 0x0fffff00;
       PAPI_NATIVE_UMASK_SHIFT = 8;
       /* Itanium2 */
     } else if ( _papi_hwi_system_info.hw_info.cpuid_family == 31 ||
		 _papi_hwi_system_info.hw_info.cpuid_family == 32 ) {
       PAPI_NATIVE_EVENT_AND_MASK = 0x00000fff;
       PAPI_NATIVE_UMASK_AND_MASK = 0x0ffff000;
       PAPI_NATIVE_UMASK_SHIFT = 12;
     }
   }


   return PAPI_OK;
}
Esempio n. 18
0
int
main(int argc, char **argv)
{
	struct perf_event_attr attr;
	int fd, ret;
	uint64_t count = 0, values[3];

	setlocale(LC_ALL, "");

	/*
	 * Initialize libpfm library (required before we can use it)
	 */
	ret = pfm_initialize();
	if (ret != PFM_SUCCESS)
		errx(1, "cannot initialize library: %s", pfm_strerror(ret));

	memset(&attr, 0, sizeof(attr));

	/*
 	 * 1st argument: event string
 	 * 2nd argument: default privilege level (used if not specified in the event string)
 	 * 3rd argument: the perf_event_attr to initialize
 	 */
	ret = pfm_get_perf_event_encoding("cycles", PFM_PLM0|PFM_PLM3, &attr, NULL, NULL);
	if (ret != PFM_SUCCESS)
		errx(1, "cannot find encoding: %s", pfm_strerror(ret));

	/*
	 * request timing information because event may be multiplexed
	 * and thus it may not count all the time. The scaling information
	 * will be used to scale the raw count as if the event had run all
	 * along
	 */
	attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED|PERF_FORMAT_TOTAL_TIME_RUNNING;

	/* do not start immediately after perf_event_open() */
	attr.disabled = 1;

	/*
 	 * create the event and attach to self
 	 * Note that it attaches only to the main thread, there is no inheritance
 	 * to threads that may be created subsequently.
 	 *
 	 * if mulithreaded, then getpid() must be replaced by gettid()
 	 */
	fd = perf_event_open(&attr, getpid(), -1, -1, 0);
	if (fd < 0) 
		err(1, "cannot create event");

	/*
 	 * start counting now
 	 */
	ret = ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
	if (ret)
		err(1, "ioctl(enable) failed");

	printf("Fibonacci(%d)=%lu\n", N, fib(N));

	/*
 	 * stop counting
 	 */
	ret = ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
	if (ret)
		err(1, "ioctl(disable) failed");

	/*
 	 * read the count + scaling values
 	 *
 	 * It is not necessary to stop an event to read its value
 	 */
	ret = read(fd, values, sizeof(values));
	if (ret != sizeof(values))
		err(1, "cannot read results: %s", strerror(errno));

	/*
 	 * scale count
	 *
	 * values[0] = raw count
	 * values[1] = TIME_ENABLED
	 * values[2] = TIME_RUNNING
 	 */
	if (values[2])
		count = (uint64_t)((double)values[0] * values[1]/values[2]);

	printf("count=%'"PRIu64"\n", count);

	close(fd);

	/* free libpfm resources cleanly */
	pfm_terminate();

	return 0;
}
Esempio n. 19
0
int
main(int argc, char **argv)
{
	char **p;
	int i, ret;
	pid_t pid = getpid();
	pfmlib_param_t evt;
	pfarg_reg_t pd[NUM_PMDS];
	pfarg_context_t ctx[1];
	pfmlib_options_t pfmlib_options;

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		printf("Can't initialize library\n");
		exit(1);
	}
	
	/* 
	 * check that the user did not specify too many events
	 */
	if (argc-1 > pfm_get_num_counters()) {
		printf("Too many events specified\n");
		exit(1);
	}

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
	pfm_set_options(&pfmlib_options);

	memset(pd, 0, sizeof(pd));
	memset(ctx, 0, sizeof(ctx));

	/*
	 * prepare parameters to library. we don't use any Itanium
	 * specific features here. so the pfp_model is NULL.
	 */
	memset(&evt,0, sizeof(evt));

	/*
	 * be nice to user!
	 */
	p = argc > 1 ? argv+1 : event_list;
	for (i=0; *p ; i++, p++) {
		if (pfm_find_event(*p, &evt.pfp_events[i].event) != PFMLIB_SUCCESS) {
			fatal_error("Cannot find %s event\n", *p);
		}
	}

	/*
	 * set the default privilege mode for all counters:
	 * 	PFM_PLM3 : user level only
	 */
	evt.pfp_dfl_plm   = PFM_PLM3; 

	/*
	 * how many counters we use
	 */
	evt.pfp_event_count = i;

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&evt)) != PFMLIB_SUCCESS) {
		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
	}
	/*
	 * for this example, we have decided not to get notified
	 * on counter overflows and the monitoring is not to be inherited
	 * in derived tasks.
	 */
	ctx[0].ctx_flags = PFM_FL_INHERIT_NONE;

	/*
	 * now create the context for self monitoring/per-task
	 */
	if (perfmonctl(pid, PFM_CREATE_CONTEXT, ctx, 1) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("Can't create PFM context %s\n", strerror(errno));
	}
	/* 
	 * Must be done before any PMD/PMD calls (unfreeze PMU). Initialize
	 * PMC/PMD to safe values. psr.up is cleared.
	 */
	if (perfmonctl(pid, PFM_ENABLE, NULL, 0) == -1) {
		fatal_error("perfmonctl error PFM_ENABLE errno %d\n",errno);
	}

	/*
	 * Now prepare the argument to initialize the PMDs.
	 * the memset(pd) initialized the entire array to zero already, so
	 * we just have to fill in the register numbers from the pc[] array.
	 */
	for (i=0; i < evt.pfp_event_count; i++) {
		pd[i].reg_num = evt.pfp_pc[i].reg_num;
	}
	/*
	 * Now program the registers
	 *
	 * We don't use the save variable to indicate the number of elements passed to
	 * the kernel because, as we said earlier, pc may contain more elements than
	 * the number of events we specified, i.e., contains more thann coutning monitors.
	 */
	if (perfmonctl(pid, PFM_WRITE_PMCS, evt.pfp_pc, evt.pfp_pc_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMCS errno %d\n",errno);
	}
	if (perfmonctl(pid, PFM_WRITE_PMDS, pd, evt.pfp_event_count) == -1) {
		{int i; for(i=0; i < evt.pfp_event_count; i++) printf("pmd%d: 0x%x\n", i, pd[i].reg_flags);}
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}

	/*
	 * Let's roll now
	 */
	pfm_start();

	noploop(10000000);

	pfm_stop();

	/* 
	 * now read the results
	 */
	if (perfmonctl(pid, PFM_READ_PMDS, pd, evt.pfp_event_count) == -1) {
		fatal_error( "perfmonctl error READ_PMDS errno %d\n",errno);
		return -1;
	}
	/* 
	 * print the results
	 *
	 * It is important to realize, that the first event we specified may not
	 * be in PMD4. Not all events can be measured by any monitor. That's why
	 * we need to use the pc[] array to figure out where event i was allocated.
	 *
	 */
	for (i=0; i < evt.pfp_event_count; i++) {
		char *name;
		pfm_get_event_name(evt.pfp_events[i].event, &name);
		printf("PMD%u %20lu %s\n", 
			pd[i].reg_num, 
			pd[i].reg_value, 
			name);
	}
	/* 
	 * let's stop this now
	 */
	if (perfmonctl(pid, PFM_DESTROY_CONTEXT, NULL, 0) == -1) {
		fatal_error( "child: perfmonctl error PFM_DESTROY errno %d\n",errno);
	}

	return 0;
}
Esempio n. 20
0
int
main(int argc, char **argv)
{
	struct sigaction act;
	uint64_t *val;
	size_t sz, pgsz;
	int ret, i;

	setlocale(LC_ALL, "");

	ret = pfm_initialize();
	if (ret != PFM_SUCCESS)
		errx(1, "Cannot initialize library: %s", pfm_strerror(ret));

	pgsz = sysconf(_SC_PAGESIZE);

	/*
	 * Install the signal handler (SIGIO)
	 * need SA_SIGINFO because we need the fd
	 * in the signal handler
	 */
	memset(&act, 0, sizeof(act));
	act.sa_sigaction = sigio_handler;
	act.sa_flags = SA_SIGINFO;
	sigaction (SIGIO, &act, 0);

	/*
 	 * allocates fd for us
 	 */
	ret = perf_setup_list_events("cycles,"
				       "instructions",
					&fds, &num_fds);
	if (ret || (num_fds == 0))
		exit(1);

	fds[0].fd = -1;
	for(i=0; i < num_fds; i++) {

		/* want a notification for every each added to the buffer */
		fds[i].hw.disabled = !i;
		if (!i) {
			fds[i].hw.wakeup_events = 1;
			fds[i].hw.sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_READ|PERF_SAMPLE_PERIOD;
			fds[i].hw.sample_period = SMPL_PERIOD;

			/* read() returns event identification for signal handler */
			fds[i].hw.read_format = PERF_FORMAT_GROUP|PERF_FORMAT_ID|PERF_FORMAT_SCALE;
		}

		fds[i].fd = perf_event_open(&fds[i].hw, 0, -1, fds[0].fd, 0);
		if (fds[i].fd == -1)
			err(1, "cannot attach event %s", fds[i].name);
	}
	
	sz = (3+2*num_fds)*sizeof(uint64_t);
	val = malloc(sz);
	if (!val)
		err(1, "cannot allocated memory");
	/*
	 * On overflow, the non lead events are stored in the sample.
	 * However we need some key to figure the order in which they
	 * were laid out in the buffer. The file descriptor does not
	 * work for this. Instead, we extract a unique ID for each event.
	 * That id will be part of the sample for each event value.
	 * Therefore we will be able to match value to events
	 *
	 * PERF_FORMAT_ID: returns unique 64-bit identifier in addition
	 * to event value.
	 */
	ret = read(fds[0].fd, val, sz);
	if (ret == -1)
		err(1, "cannot read id %zu", sizeof(val));

	/*
	 * we are using PERF_FORMAT_GROUP, therefore the structure
	 * of val is as follows:
	 *
	 *      { u64           nr;
	 *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
	 *        { u64         time_running; } && PERF_FORMAT_RUNNING
	 *        { u64         value;                  
	 *          { u64       id;           } && PERF_FORMAT_ID
	 *        }             cntr[nr];               
	 * We are skipping the first 3 values (nr, time_enabled, time_running)
	 * and then for each event we get a pair of values.
	 */ 
	for(i=0; i < num_fds; i++) {
		fds[i].id = val[2*i+1+3];
		printf("%"PRIu64"  %s\n", fds[i].id, fds[i].name);
	}
	 
	fds[0].buf = mmap(NULL, (buffer_pages+1)*pgsz, PROT_READ|PROT_WRITE, MAP_SHARED, fds[0].fd, 0);
	if (fds[0].buf == MAP_FAILED)
		err(1, "cannot mmap buffer");
	
	fds[0].pgmsk = (buffer_pages * pgsz) - 1;

	/*
	 * setup asynchronous notification on the file descriptor
	 */
	ret = fcntl(fds[0].fd, F_SETFL, fcntl(fds[0].fd, F_GETFL, 0) | O_ASYNC);
	if (ret == -1)
		err(1, "cannot set ASYNC");

	/*
 	 * necessary if we want to get the file descriptor for
 	 * which the SIGIO is sent in siginfo->si_fd.
 	 * SA_SIGINFO in itself is not enough
 	 */
	ret = fcntl(fds[0].fd, F_SETSIG, SIGIO);
	if (ret == -1)
		err(1, "cannot setsig");

	/*
	 * get ownership of the descriptor
	 */
	ret = fcntl(fds[0].fd, F_SETOWN, getpid());
	if (ret == -1)
		err(1, "cannot setown");

	/*
	 * enable the group for one period
	 */
	ret = ioctl(fds[0].fd, PERF_EVENT_IOC_REFRESH , 1);
	if (ret == -1)
		err(1, "cannot refresh");

	busyloop();

	ret = ioctl(fds[0].fd, PERF_EVENT_IOC_DISABLE, 1);
	if (ret == -1)
		err(1, "cannot disable");

	/*
	 * destroy our session
	 */
	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	perf_free_fds(fds, num_fds);
	free(val);

	/* free libpfm resources cleanly */
	pfm_terminate();

	return 0;
}
Esempio n. 21
0
int
main(int argc, char **argv)
{
	pfarg_context_t ctx[1];
	pfmlib_input_param_t inp;
	pfmlib_output_param_t outp;
	pfarg_reg_t pc[NUM_PMCS];
	pfarg_load_t load_args;
	pfmlib_options_t pfmlib_options;
	struct sigaction act;
	size_t len;
	unsigned int i, num_counters;
	int ret;

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		printf("Can't initialize library\n");
		exit(1);
	}

	/*
	 * Install the signal handler (SIGIO)
	 */
	memset(&act, 0, sizeof(act));
	act.sa_handler = (sig_t)sigio_handler;
	sigaction (SIGIO, &act, 0);

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
	pfm_set_options(&pfmlib_options);

	memset(pc, 0, sizeof(pc));
	memset(ctx, 0, sizeof(ctx));
	memset(&load_args, 0, sizeof(load_args));
	memset(&inp,0, sizeof(inp));
	memset(&outp,0, sizeof(outp));

	pfm_get_num_counters(&num_counters);

	if (pfm_get_cycle_event(&inp.pfp_events[0]) != PFMLIB_SUCCESS)
		fatal_error("cannot find cycle event\n");

	if (pfm_get_inst_retired_event(&inp.pfp_events[1]) != PFMLIB_SUCCESS)
		fatal_error("cannot find inst retired event\n");

	i = 2;

	if (i > num_counters) {
		i = num_counters;
		printf("too many events provided (max=%d events), using first %d event(s)\n", num_counters, i);
	}

	/*
	 * set the default privilege mode for all counters:
	 * 	PFM_PLM3 : user level only
	 */
	inp.pfp_dfl_plm = PFM_PLM3;

	/*
	 * how many counters we use
	 */
	inp.pfp_event_count = i;

	/*
	 * how many counters we use
	 */
	if (i > 1) {
		inp.pfp_event_count = i;

		pfm_get_max_event_name_len(&len);

		event1_name = malloc(len+1);
		if (event1_name == NULL)
			fatal_error("cannot allocate event name\n");

		pfm_get_full_event_name(&inp.pfp_events[1], event1_name, len+1);
	}

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS) {
		fatal_error("Cannot configure events: %s\n", pfm_strerror(ret));
	}
	/*
	 * when we know we are self-monitoring and we have only one context, then
	 * when we get an overflow we know where it is coming from. Therefore we can
	 * save the call to the kernel to extract the notification message. By default,
	 * a message is generated. The queue of messages has a limited size, therefore
	 * it is important to clear the queue by reading the message on overflow. Failure
	 * to do so may result in a queue full and you will lose notification messages.
	 *
	 * With the PFM_FL_OVFL_NO_MSG, no message will be queue, but you will still get
	 * the signal. Similarly, the PFM_MSG_END will be generated.
	 */
	ctx[0].ctx_flags = PFM_FL_OVFL_NO_MSG;

	/*
	 * now create the context for self monitoring/per-task
	 */
	if (perfmonctl(0, PFM_CREATE_CONTEXT, ctx, 1) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("Can't create PFM context %s\n", strerror(errno));
	}
	ctx_fd = ctx->ctx_fd;

	/*
	 * Now prepare the argument to initialize the PMDs and PMCS.
	 * We use pfp_pmc_count to determine the number of registers to
	 * setup. Note that this field can be >= pfp_event_count.
	 */

	for (i=0; i < outp.pfp_pmc_count; i++) {
		pc[i].reg_num   = outp.pfp_pmcs[i].reg_num;
		pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
	}

	for (i=0; i < inp.pfp_event_count; i++) {
		pd[i].reg_num   = pc[i].reg_num;
	}
	/*
	 * We want to get notified when the counter used for our first
	 * event overflows
	 */
	pc[0].reg_flags 	|= PFM_REGFL_OVFL_NOTIFY;
	pc[0].reg_reset_pmds[0] |= 1UL << outp.pfp_pmcs[1].reg_num;

	/*
	 * we arm the first counter, such that it will overflow
	 * after SMPL_PERIOD events have been observed
	 */
	pd[0].reg_value       = (~0UL) - SMPL_PERIOD + 1;
	pd[0].reg_long_reset  = (~0UL) - SMPL_PERIOD + 1;
	pd[0].reg_short_reset = (~0UL) - SMPL_PERIOD + 1;

	/*
	 * Now program the registers
	 *
	 * We don't use the save variable to indicate the number of elements passed to
	 * the kernel because, as we said earlier, pc may contain more elements than
	 * the number of events we specified, i.e., contains more than counting monitors.
	 */
	if (perfmonctl(ctx_fd, PFM_WRITE_PMCS, pc, outp.pfp_pmc_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMCS errno %d\n",errno);
	}

	if (perfmonctl(ctx_fd, PFM_WRITE_PMDS, pd, inp.pfp_event_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}

	/*
	 * we want to monitor ourself
	 */
	load_args.load_pid = getpid();

	if (perfmonctl(ctx_fd, PFM_LOAD_CONTEXT, &load_args, 1) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}

	/*
	 * setup asynchronous notification on the file descriptor
	 */
	ret = fcntl(ctx_fd, F_SETFL, fcntl(ctx_fd, F_GETFL, 0) | O_ASYNC);
	if (ret == -1) {
		fatal_error("cannot set ASYNC: %s\n", strerror(errno));
	}

	/*
	 * get ownership of the descriptor
	 */
	ret = fcntl(ctx_fd, F_SETOWN, getpid());
	if (ret == -1) {
		fatal_error("cannot setown: %s\n", strerror(errno));
	}

	/*
	 * Let's roll now
	 */
	pfm_self_start(ctx_fd);

	busyloop();

	pfm_self_stop(ctx_fd);

	/*
	 * free our context
	 */
	close(ctx_fd);

	return 0;
}
Esempio n. 22
0
int
main(int argc, char **argv)
{
	pfmlib_input_param_t inp;
	pfmlib_output_param_t outp;
	pfmlib_core_input_param_t mod_inp;
	pfmlib_options_t pfmlib_options;
	pfarg_pmr_t pc[NUM_PMCS];
	pfarg_pmd_attr_t pd[NUM_PMDS];
	pfarg_sinfo_t sif;
	struct pollfd fds;
	smpl_arg_t buf_arg;
	pfarg_msg_t msg;
	smpl_hdr_t *hdr;
	void *buf_addr;
	uint64_t pebs_size;
	pid_t pid;
	int ret, fd, type;
	unsigned int i;
	uint32_t ctx_flags;

	if (argc < 2)
		fatal_error("you need to pass a program to sample\n");

	if (pfm_initialize() != PFMLIB_SUCCESS)
		fatal_error("libpfm intialization failed\n");

	/*
	 * check we are on an Intel Core PMU
	 */
	pfm_get_pmu_type(&type);
	if (type != PFMLIB_INTEL_CORE_PMU && type != PFMLIB_INTEL_ATOM_PMU)
		fatal_error("This program only works with an Intel Core processor\n");

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug   = 0; /* set to 1 for debug */
	pfmlib_options.pfm_verbose = 1; /* set to 1 for verbose */
	pfm_set_options(&pfmlib_options);

	memset(pd, 0, sizeof(pd));
	memset(pc, 0, sizeof(pc));
	memset(&inp, 0, sizeof(inp));
	memset(&outp, 0, sizeof(outp));
	memset(&mod_inp, 0, sizeof(mod_inp));
	memset(&sif, 0, sizeof(sif));

	memset(&buf_arg, 0, sizeof(buf_arg));

	memset(&fds, 0, sizeof(fds));

	/*
	 * search for our sampling event
	 */
	if (pfm_find_full_event(SMPL_EVENT, &inp.pfp_events[0]) != PFMLIB_SUCCESS)
		fatal_error("cannot find sampling event %s\n", SMPL_EVENT);

	inp.pfp_event_count = 1;
	inp.pfp_dfl_plm = PFM_PLM3;

	/*
	 * important: inform libpfm we do use PEBS
	 */
	mod_inp.pfp_core_pebs.pebs_used = 1;

	/*
	 * sampling buffer parameters
	 */
	pebs_size = 3 * getpagesize();
	buf_arg.buf_size = pebs_size;

	/*
	 * sampling period cannot use more bits than HW counter can supoprt
	 */
	buf_arg.cnt_reset = -SMPL_PERIOD;

	/*
	 * We want a system-wide context for sampling
	 */
	ctx_flags = PFM_FL_SYSTEM_WIDE | PFM_FL_SMPL_FMT;

	/*
	 * trigger notification (interrupt) when reaching the very end of
	 * the buffer
	 */
	buf_arg.intr_thres = (pebs_size/sizeof(smpl_entry_t))*90/100;

	/*
 	 * we want to measure CPU0, thus we pin ourself to the CPU before invoking
 	 * perfmon. This ensures that the sampling buffer will be allocated on the
 	 * same NUMA node.
 	 */
	ret = pin_cpu(getpid(), 0);
	if (ret)
		fatal_error("cannot pin on CPU0");

	/*
	 * create session and sampling buffer
	 */
	fd = pfm_create(ctx_flags, &sif, FMT_NAME, &buf_arg, sizeof(buf_arg));
	if (fd == -1) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("cannot create session %s, maybe you do not have the PEBS sampling format in the kernel.\nCheck /sys/kernel/perfmon/formats\n", strerror(errno));
	}

	/*
	 * map buffer into our address space
	 */
	buf_addr = mmap(NULL, (size_t)buf_arg.buf_size, PROT_READ, MAP_PRIVATE, fd, 0);
	printf("session [%d] buffer mapped @%p\n", fd, buf_addr);
	if (buf_addr == MAP_FAILED)
		fatal_error("cannot mmap sampling buffer errno %d\n", errno);

	hdr = (smpl_hdr_t *)buf_addr;

	printf("pebs_base=0x%llx pebs_end=0x%llx index=0x%llx\n"
	       "intr=0x%llx version=%u.%u\n"
	       "entry_size=%zu ds_size=%zu\n",
			(unsigned long long)hdr->ds.pebs_buf_base,
			(unsigned long long)hdr->ds.pebs_abs_max,
			(unsigned long long)hdr->ds.pebs_index,
			(unsigned long long)hdr->ds.pebs_intr_thres,
			PFM_VERSION_MAJOR(hdr->version),
			PFM_VERSION_MINOR(hdr->version),
			sizeof(smpl_entry_t),
			sizeof(hdr->ds));

	if (PFM_VERSION_MAJOR(hdr->version) < 1)
		fatal_error("invalid buffer format version\n");

	/*
	 * get which PMC registers are available
	 */
	detect_unavail_pmu_regs(&sif, &inp.pfp_unavail_pmcs, NULL);

	/*
	 * let libpfm figure out how to assign event onto PMU registers
	 */
	if (pfm_dispatch_events(&inp, &mod_inp, &outp, NULL) != PFMLIB_SUCCESS)
		fatal_error("cannot assign event %s\n", SMPL_EVENT);


	/*
	 * propagate PMC setup from libpfm to perfmon
	 */
	for (i=0; i < outp.pfp_pmc_count; i++) {
		pc[i].reg_num   = outp.pfp_pmcs[i].reg_num;
		pc[i].reg_value = outp.pfp_pmcs[i].reg_value;

		/*
		 * must disable 64-bit emulation on the PMC0 counter.
		 * PMC0 is the only counter useable with PEBS. We must disable
		 * 64-bit emulation to avoid getting interrupts for each
		 * sampling period, PEBS takes care of this part.
		 */
		if (pc[i].reg_num == 0)
			pc[i].reg_flags = PFM_REGFL_NO_EMUL64;
	}

	/*
	 * propagate PMD set from libpfm to perfmon
	 */
	for (i=0; i < outp.pfp_pmd_count; i++)
		pd[i].reg_num = outp.pfp_pmds[i].reg_num;

	/*
	 * setup sampling period for first counter
	 * we want notification on overflow, i.e., when buffer is full
	 */
	pd[0].reg_flags = PFM_REGFL_OVFL_NOTIFY;
	pd[0].reg_value = -SMPL_PERIOD;

	pd[0].reg_long_reset = -SMPL_PERIOD;
	pd[0].reg_short_reset = -SMPL_PERIOD;
	
	/*
	 * Now program the registers
	 */
	if (pfm_write(fd, 0, PFM_RW_PMC, pc, outp.pfp_pmc_count * sizeof(*pc)) == -1)
		fatal_error("pfm_write error errno %d\n",errno);

	if (pfm_write(fd, 0, PFM_RW_PMD_ATTR, pd, outp.pfp_pmd_count * sizeof(*pd)) == -1)
		fatal_error("pfm_write(PMD) error errno %d\n",errno);

	/*
	 *  attach the session to CPU0
	 */
	if (pfm_attach(fd, 0, 0) == -1)
		fatal_error("pfm_attach error errno %d\n",errno);

	/*
	 * Create the child task
	 */
	signal(SIGCHLD, handler);

	if ((pid=fork()) == -1)
		fatal_error("Cannot fork process\n");

	if (pid == 0) {
		/* child does not inherit context file descriptor */
		close(fd);

		/* if child is too short-lived we may not measure it */
		child(argv+1);
	}

	/*
	 * start monitoring
	 */
	if (pfm_set_state(fd, 0, PFM_ST_START) == -1)
		fatal_error("pfm_set_state(start) error errno %d\n",errno);

	fds.fd = fd;
	fds.events = POLLIN;
	/*
	 * core loop
	 */
	for(;done == 0;) {
		/*
		 * Must use a timeout to avoid a race condition
		 * with the SIGCHLD signal
		 */
		ret = poll(&fds, 1, 500);

		/*
		 * if timeout expired, then check done
		 */
		if (ret == 0)
			continue;

		if (ret == -1) {
			if(ret == -1 && errno == EINTR) {
				warning("read interrupted, retrying\n");
				continue;
			}
			fatal_error("poll failed: %s\n", strerror(errno));
		}

		ret = read(fd, &msg, sizeof(msg));
		if (ret == -1)
			fatal_error("cannot read perfmon msg: %s\n", strerror(errno));

		switch(msg.type) {
			case PFM_MSG_OVFL: /* the sampling buffer is full */
				process_smpl_buf(hdr);
				/*
				 * reactivate monitoring once we are done with the samples
				 * in syste-wide, interface guarantees monitoring is active
				 * upon return from the pfm_restart() syscall
				 */
				if (pfm_set_state(fd, 0, PFM_ST_RESTART) == -1)
					fatal_error("pfm_set_state(restart) error errno %d\n",errno);
				break;
			default: fatal_error("unknown message type %d\n", msg.type);
		}
	}
	/*
	 * cleanup child
	 */
	waitpid(pid, NULL, 0);

	/*
	 * stop monitoring, this is required in order to guarantee that the PEBS buffer
	 * header is updated with the latest position, such that we see see the final
	 * samples
	 */
	if (pfm_set_state(fd, 0, PFM_ST_STOP) == -1)
		fatal_error("pfm_set_state(stop) error errno %d\n",errno);

	/*
	 * check for any leftover samples. Must have monitoring stopped
	 * for this operation to have guarantee it is up to date
	 */
	process_smpl_buf(hdr);

	/*
	 * close session
	 */
	close(fd);

	/*
	 * unmap sampling buffer and actually free the perfmon session
	 */
	munmap(buf_addr, (size_t)buf_arg.buf_size);

	return 0;
}
int
main(void)
{
	int ret;
	int type = 0;
	char *name;
	pid_t pid = getpid();
	pfmlib_param_t evt;
	pfmlib_ita2_param_t ita2_param;
	pfarg_reg_t pd[NUM_PMDS];
	pfarg_context_t ctx[1];
	pfmlib_options_t pfmlib_options;

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		fatal_error("Can't initialize library\n");
	}

	/*
	 * Let's make sure we run this on the right CPU
	 */
	pfm_get_pmu_type(&type);
	if (type != PFMLIB_ITANIUM2_PMU) {
		char *model; 
		pfm_get_pmu_name(&model);
		fatal_error("this program does not work with the %s PMU\n", model);
	}

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug = 0; /* set to 1 for debug */
	pfmlib_options.pfm_verbose = 0; /* set to 1 for verbose */
	pfm_set_options(&pfmlib_options);



	memset(pd, 0, sizeof(pd));
	memset(ctx, 0, sizeof(ctx));

	memset(&evt,0, sizeof(evt));
	memset(&ita2_param,0, sizeof(ita2_param));

	/*
	 * because we use a model specific feature, we must initialize the
	 * model specific pfmlib parameter structure and link it to the
	 * common structure.
	 * The magic number is a simple mechanism used by the library to check
	 * that the model specific data structure is decent. You must set it manually
	 * otherwise the model specific feature won't work.
	 */
	ita2_param.pfp_magic = PFMLIB_ITA2_PARAM_MAGIC;
	evt.pfp_model       = &ita2_param;

	/*
	 * We indicate that we are using the PMC8 opcode matcher. This is required
	 * otherwise the library add PMC8 to the list of PMC to pogram during
	 * pfm_dispatch_events().
	 */
	ita2_param.pfp_ita2_pmc8.opcm_used = 1;

	/*
	 * We want to match all the br.cloop in our test function.
	 * This branch is an IP-relative branch for which the major
	 * opcode (bits [40-37]=4) and the btype field is 5 (which represents
	 * bits[6-8]) so it is included in the match/mask fields of PMC8. 
	 * It is necessarily in a B slot.
	 *
	 * We don't care which operands are used with br.cloop therefore
	 * the mask field of pmc8 is set such that only the 4 bits of the
	 * opcode and 3 bits of btype must match exactly. This is accomplished by 
	 * clearing the top 4 bits and bits [6-8] of the mask field and setting the 
	 * remaining bits.  Similarly, the match field only has the opcode value  and btype
	 * set according to the encoding of br.cloop, the
	 * remaining bits are zero. Bit 60 of PMC8 is set to indicate
	 * that we look only in B slots  (this is the only possibility for
	 * this instruction anyway). 
	 *
	 * So the binary representation of the value for PMC8 is as follows:
	 *
	 * 6666555555555544444444443333333333222222222211111111110000000000
	 * 3210987654321098765432109876543210987654321098765432109876543210
	 * ----------------------------------------------------------------
	 * 0001010000000000000000101000000000000011111111111111000111111000
	 * 
	 * which yields a value of 0x1400028003fff1f8.
	 *
	 * Depending on the level of optimization to compile this code, it may 
	 * be that the count reported could be zero, if the compiler uses a br.cond 
	 * instead of br.cloop.
	 *
	 *
	 * The 0x1 sets the ig_ad field to make sure we ignore any range restriction.
	 * Also bit 2 must always be set
	 */
	ita2_param.pfp_ita2_pmc8.pmc_val = 0x1400028003fff1fa;

	/*
	 * To count the number of occurence of this instruction, we must
	 * program a counting monitor with the IA64_TAGGED_INST_RETIRED_PMC8
	 * event.
	 */
	if (pfm_find_event_byname("IA64_TAGGED_INST_RETIRED_IBRP0_PMC8", &evt.pfp_events[0].event) != PFMLIB_SUCCESS) {
		fatal_error("cannot find event IA64_TAGGED_INST_RETIRED_IBRP0_PMC8\n");
	}

	/*
	 * set the privilege mode:
	 * 	PFM_PLM3 : user level only
	 */
	evt.pfp_dfl_plm   = PFM_PLM3; 
	/*
	 * how many counters we use
	 */
	evt.pfp_event_count = 1;

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&evt)) != PFMLIB_SUCCESS) {
		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
	}
	/*
	 * for this example, we have decided not to get notified
	 * on counter overflows and the monitoring is not to be inherited
	 * in derived tasks
	 */
	ctx[0].ctx_flags = PFM_FL_INHERIT_NONE;

	/*
	 * now create the context for self monitoring/per-task
	 */
	if (perfmonctl(pid, PFM_CREATE_CONTEXT, ctx, 1) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("Can't create PFM context %s\n", strerror(errno));
	}
	/* 
	 * Must be done before any PMD/PMD calls (unfreeze PMU). Initialize
	 * PMC/PMD to safe values. psr.up is cleared.
	 */
	if (perfmonctl(pid, PFM_ENABLE, NULL, 0) == -1) {
		fatal_error("perfmonctl error PFM_ENABLE errno %d\n",errno);
	}

	/*
	 * Now prepare the argument to initialize the PMD.
	 */
	pd[0].reg_num = evt.pfp_pc[0].reg_num;

	/*
	 * Now program the registers
	 *
	 * We don't use the save variable to indicate the number of elements passed to
	 * the kernel because, as we said earlier, pc may contain more elements than
	 * the number of events we specified, i.e., contains more thann coutning monitors.
	 */
	if (perfmonctl(pid, PFM_WRITE_PMCS, evt.pfp_pc, evt.pfp_pc_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMCS errno %d\n",errno);
	}
	if (perfmonctl(pid, PFM_WRITE_PMDS, pd, evt.pfp_event_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}

	/*
	 * Let's roll now.
	 */
	pfm_start();

	do_test(100UL);

	pfm_stop();

	/* 
	 * now read the results
	 */
	if (perfmonctl(pid, PFM_READ_PMDS, pd, evt.pfp_event_count) == -1) {
		fatal_error("perfmonctl error READ_PMDS errno %d\n",errno);
	}

	/* 
	 * print the results
	 */
	pfm_get_event_name(evt.pfp_events[0].event, &name);
	printf("PMD%u %20lu %s\n", 
			pd[0].reg_num, 
			pd[0].reg_value, 
			name);

	if (pd[0].reg_value != 0) 
		printf("compiler used br.cloop\n");
	else
		printf("compiler did not use br.cloop\n");

	/* 
	 * let's stop this now
	 */
	if (perfmonctl(pid, PFM_DESTROY_CONTEXT, NULL, 0) == -1) {
		fatal_error("perfmonctl error PFM_DESTROY errno %d\n",errno);
	}
	return 0;
}
Esempio n. 24
0
int
mainloop(char **arg)
{
	static uint64_t ovfl_count = 0; /* static to avoid setjmp issue */
	struct pollfd pollfds[1];
	int ret;
	int fd = -1;
	int i;

	if (pfm_initialize() != PFM_SUCCESS)
		errx(1, "libpfm initialization failed\n");

	pgsz = sysconf(_SC_PAGESIZE);
	map_size = (options.mmap_pages+1)*pgsz;

	if (options.cgroup) {
		fd = open_cgroup(options.cgroup);
		if (fd == -1)
			err(1, "cannot open cgroup file %s\n", options.cgroup);
	}

	setup_cpu(options.cpu, fd);

	signal(SIGALRM, handler);
	signal(SIGINT, handler);

	pollfds[0].fd = fds[0].fd;
	pollfds[0].events = POLLIN;

	printf("monitoring on CPU%d, session ending in %ds\n", options.cpu, options.delay);

	if (setjmp(jbuf) == 1)
		goto terminate_session;

	start_cpu();

	alarm(options.delay);
	/*
	 * core loop
	 */
	for(;;) {
		ret = poll(pollfds, 1, -1);
		if (ret < 0 && errno == EINTR)
			break;
		ovfl_count++;
		process_smpl_buf(&fds[0]);
	}
terminate_session:
	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	/* check for partial event buffer */
	process_smpl_buf(&fds[0]);
	munmap(fds[0].buf, map_size);

	free(fds);

	printf("%"PRIu64" samples collected in %"PRIu64" poll events, %"PRIu64" lost samples\n",
		collected_samples,
		ovfl_count, lost_samples);
	return 0;
}
Esempio n. 25
0
int
main(void)
{
	pfmlib_input_param_t inp;
	pfmlib_output_param_t outp;
	pfmlib_ita2_input_param_t ita2_inp;
	pfarg_reg_t pd[NUM_PMDS];
	pfarg_reg_t pc[NUM_PMCS];
	pfarg_context_t ctx[1];
	pfarg_load_t load_args;
	pfmlib_options_t pfmlib_options;
	int ret;
	int type = 0;
	int id;
	unsigned int i;
	char name[MAX_EVT_NAME_LEN];

	/*
	 * Initialize pfm library (required before we can use it)
	 */
	if (pfm_initialize() != PFMLIB_SUCCESS) {
		fatal_error("Can't initialize library\n");
	}

	/*
	 * Let's make sure we run this on the right CPU
	 */
	pfm_get_pmu_type(&type);
	if (type != PFMLIB_ITANIUM2_PMU) {
		char model[MAX_PMU_NAME_LEN];
		pfm_get_pmu_name(model, MAX_PMU_NAME_LEN);
		fatal_error("this program does not work with the %s PMU\n", model);
	}

	/*
	 * pass options to library (optional)
	 */
	memset(&pfmlib_options, 0, sizeof(pfmlib_options));
	pfmlib_options.pfm_debug   = 0; /* set to 1 for debug */
	pfmlib_options.pfm_verbose = 0; /* set to 1 for verbose */
	pfm_set_options(&pfmlib_options);

	memset(pd, 0, sizeof(pd));
	memset(pc, 0, sizeof(pc));
	memset(ctx, 0, sizeof(ctx));
	memset(&load_args, 0, sizeof(load_args));

	memset(&inp,0, sizeof(inp));
	memset(&outp,0, sizeof(outp));
	memset(&ita2_inp,0, sizeof(ita2_inp));

	/*
	 * We indicate that we are using the PMC8 opcode matcher. This is required
	 * otherwise the library add PMC8 to the list of PMC to pogram during
	 * pfm_dispatch_events().
	 */
	ita2_inp.pfp_ita2_pmc8.opcm_used = 1;

	/*
	 * We want to match all the br.cloop in our test function.
	 * This branch is an IP-relative branch for which the major
	 * opcode (bits [40-37]=4) and the btype field is 5 (which represents
	 * bits[6-8]) so it is included in the match/mask fields of PMC8.
	 * It is necessarily in a B slot.
	 *
	 * We don't care which operands are used with br.cloop therefore
	 * the mask field of pmc8 is set such that only the 4 bits of the
	 * opcode and 3 bits of btype must match exactly. This is accomplished by
	 * clearing the top 4 bits and bits [6-8] of the mask field and setting the
	 * remaining bits.  Similarly, the match field only has the opcode value  and btype
	 * set according to the encoding of br.cloop, the
	 * remaining bits are zero. Bit 60 of PMC8 is set to indicate
	 * that we look only in B slots  (this is the only possibility for
	 * this instruction anyway).
	 *
	 * So the binary representation of the value for PMC8 is as follows:
	 *
	 * 6666555555555544444444443333333333222222222211111111110000000000
	 * 3210987654321098765432109876543210987654321098765432109876543210
	 * ----------------------------------------------------------------
	 * 0001010000000000000000101000000000000011111111111111000111111000
	 *
	 * which yields a value of 0x1400028003fff1f8.
	 *
	 * Depending on the level of optimization to compile this code, it may
	 * be that the count reported could be zero, if the compiler uses a br.cond
	 * instead of br.cloop.
	 *
	 *
	 * The 0x1 sets the ig_ad field to make sure we ignore any range restriction.
	 * Also bit 2 must always be set
	 */
	ita2_inp.pfp_ita2_pmc8.pmc_val = 0x1400028003fff1fa;

	/*
	 * To count the number of occurence of this instruction, we must
	 * program a counting monitor with the IA64_TAGGED_INST_RETIRED_PMC8
	 * event.
	 */
	if (pfm_find_full_event("IA64_TAGGED_INST_RETIRED_IBRP0_PMC8", &inp.pfp_events[0]) != PFMLIB_SUCCESS) {
		fatal_error("cannot find event IA64_TAGGED_INST_RETIRED_IBRP0_PMC8\n");
	}

	/*
	 * set the privilege mode:
	 * 	PFM_PLM3 : user level only
	 */
	inp.pfp_dfl_plm   = PFM_PLM3;
	/*
	 * how many counters we use
	 */
	inp.pfp_event_count = 1;

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&inp, &ita2_inp, &outp, NULL)) != PFMLIB_SUCCESS) {
		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));
	}

	/*
	 * now create the context for self monitoring/per-task
	 */
	if (perfmonctl(0, PFM_CREATE_CONTEXT, ctx, 1) == -1 ) {
		if (errno == ENOSYS) {
			fatal_error("Your kernel does not have performance monitoring support!\n");
		}
		fatal_error("Can't create PFM context %s\n", strerror(errno));
	}
	/*
	 * extract the unique identifier for our context, a regular file descriptor
	 */
	id = ctx[0].ctx_fd;

	/*
	 * Now prepare the argument to initialize the PMDs and PMCS.
	 * We must pfp_pmc_count to determine the number of PMC to intialize.
	 * We must use pfp_event_count to determine the number of PMD to initialize.
	 * Some events causes extra PMCs to be used, so  pfp_pmc_count may be >= pfp_event_count.
	 *
	 * This step is new compared to libpfm-2.x. It is necessary because the library no
	 * longer knows about the kernel data structures.
	 */

	for (i=0; i < outp.pfp_pmc_count; i++) {
		pc[i].reg_num   = outp.pfp_pmcs[i].reg_num;
		pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
	}

	/*
	 * the PMC controlling the event ALWAYS come first, that's why this loop
	 * is safe even when extra PMC are needed to support a particular event.
	 */
	for (i=0; i < inp.pfp_event_count; i++) {
		pd[i].reg_num   = pc[i].reg_num;
	}
	printf("event_count=%d id=%d\n",  inp.pfp_event_count, id);

	/*
	 * Now program the registers
	 *
	 * We don't use the save variable to indicate the number of elements passed to
	 * the kernel because, as we said earlier, pc may contain more elements than
	 * the number of events we specified, i.e., contains more thann coutning monitors.
	 */
	if (perfmonctl(id, PFM_WRITE_PMCS, pc, outp.pfp_pmc_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMCS errno %d\n",errno);
	}
	if (perfmonctl(id, PFM_WRITE_PMDS, pd, inp.pfp_event_count) == -1) {
		fatal_error("perfmonctl error PFM_WRITE_PMDS errno %d\n",errno);
	}
	/*
	 * now we load (i.e., attach) the context to ourself
	 */
	load_args.load_pid = getpid();

	if (perfmonctl(id, PFM_LOAD_CONTEXT, &load_args, 1) == -1) {
		fatal_error("perfmonctl error PFM_LOAD_CONTEXT errno %d\n",errno);
	}

	/*
	 * Let's roll now.
	 */
	pfm_self_start(id);

	do_test(100UL);

	pfm_self_stop(id);

	/*
	 * now read the results
	 */
	if (perfmonctl(id, PFM_READ_PMDS, pd, inp.pfp_event_count) == -1) {
		fatal_error("perfmonctl error READ_PMDS errno %d\n",errno);
	}

	/*
	 * print the results
	 */
	pfm_get_full_event_name(&inp.pfp_events[0], name, MAX_EVT_NAME_LEN);
	printf("PMD%u %20lu %s\n",
			pd[0].reg_num,
			pd[0].reg_value,
			name);

	if (pd[0].reg_value != 0)
		printf("compiler used br.cloop\n");
	else
		printf("compiler did not use br.cloop\n");

	/*
	 * let's stop this now
	 */
	close(id);
	return 0;
}
Esempio n. 26
0
int
mainloop(char **arg)
{
	static uint64_t ovfl_count; /* static to avoid setjmp issue */
	struct pollfd pollfds[1];
	sigset_t bmask;
	int go[2], ready[2];
	size_t pgsz;
	size_t map_size = 0;
	pid_t pid;
	int status, ret;
	int i;
	char buf;

	if (pfm_initialize() != PFM_SUCCESS)
		errx(1, "libpfm initialization failed\n");

	pgsz = sysconf(_SC_PAGESIZE);
	map_size = (options.mmap_pages+1)*pgsz;

	/*
	 * does allocate fds
	 */
	ret  = perf_setup_list_events(options.events, &fds, &num_fds);
	if (ret || !num_fds)
		errx(1, "cannot setup event list");

	memset(pollfds, 0, sizeof(pollfds));

	ret = pipe(ready);
	if (ret)
		err(1, "cannot create pipe ready");

	ret = pipe(go);
	if (ret)
		err(1, "cannot create pipe go");

	/*
	 * Create the child task
	 */
//	if ((pid=fork()) == -1)
//		err(1, "cannot fork process\n");

/*	if (pid == 0) {
		close(ready[0]);
		close(go[1]);
*/
		/*
		 * let the parent know we exist
		 */
/*		close(ready[1]);
		if (read(go[0], &buf, 1) == -1)
			err(1, "unable to read go_pipe");

		exit(child(arg));
	}
*/
	int tid;
	pid = getpid();
	tid = gettid();
	printf("From C - pid : %d, tid : %d\n",pid, tid);	
	
	close(ready[1]);
	close(go[0]);

	if (read(ready[0], &buf, 1) == -1)
		err(1, "unable to read child_ready_pipe");

	close(ready[0]);

	fds[0].fd = -1;

	fds[0].hw.sample_period=10000;
	if (!fds[0].hw.sample_period)
		errx(1, "need to set sampling period or freq on first event, use :period= or :freq=");

	for(i=0; i < num_fds; i++) {

		if (i == 0) {
			fds[i].hw.disabled = 1;
			fds[i].hw.enable_on_exec = 1; /* start immediately */
		} else
			fds[i].hw.disabled = 0;


		if (options.opt_inherit)
			fds[i].hw.inherit = 1;

		if (fds[i].hw.sample_period) {
			/*
			 * set notification threshold to be halfway through the buffer
			 */
			fds[i].hw.wakeup_watermark = (options.mmap_pages*pgsz) / 2;
			fds[i].hw.watermark = 1;

			fds[i].hw.sample_type = PERF_SAMPLE_IP|PERF_SAMPLE_TID|PERF_SAMPLE_READ|PERF_SAMPLE_TIME|PERF_SAMPLE_PERIOD;
			/*
			 * if we have more than one event, then record event identifier to help with parsing
			 */
			if (num_fds > 1)
				fds[i].hw.sample_type |= PERF_SAMPLE_IDENTIFIER;

			fprintf(options.output_file,"%s period=%"PRIu64" freq=%d\n", fds[i].name, fds[i].hw.sample_period, fds[i].hw.freq);

			fds[i].hw.read_format = PERF_FORMAT_SCALE;

			if (fds[i].hw.freq)
				fds[i].hw.sample_type |= PERF_SAMPLE_PERIOD;
			
			fds[i].hw.sample_period=10000;
			if (options.mem_mode)
				fds[i].hw.sample_type |= PERF_SAMPLE_WEIGHT | PERF_SAMPLE_DATA_SRC | PERF_SAMPLE_ADDR;
			if (options.branch_mode) {
				fds[i].hw.sample_type |= PERF_SAMPLE_BRANCH_STACK;
				fds[i].hw.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
			}
		}
		/*
		 * we are grouping the events, so there may be a limit
		 */
		fds[i].fd = perf_event_open(&fds[i].hw, tid+1, options.cpu, fds[0].fd, 0);
		if (fds[i].fd == -1) {
			if (fds[i].hw.precise_ip)
				err(1, "cannot attach event %s: precise mode may not be supported", fds[i].name);
			err(1, "cannot attach event %s", fds[i].name);
		}
	}

	/*
	 * kernel adds the header page to the size of the mmapped region
	 */
	fds[0].buf = mmap(NULL, map_size, PROT_READ|PROT_WRITE, MAP_SHARED, fds[0].fd, 0);
	if (fds[0].buf == MAP_FAILED)
		err(1, "cannot mmap buffer");

	/* does not include header page */
	fds[0].pgmsk = (options.mmap_pages*pgsz)-1;

	/*
	 * send samples for all events to first event's buffer
	 */
	for (i = 1; i < num_fds; i++) {
		if (!fds[i].hw.sample_period)
			continue;
		ret = ioctl(fds[i].fd, PERF_EVENT_IOC_SET_OUTPUT, fds[0].fd);
		if (ret)
			err(1, "cannot redirect sampling output");
	}

	if (num_fds > 1 && fds[0].fd > -1) {
		for(i = 0; i < num_fds; i++) {
			/*
			 * read the event identifier using ioctl
			 * new method replaced the trick with PERF_FORMAT_GROUP + PERF_FORMAT_ID + read()
			 */
			ret = ioctl(fds[i].fd, PERF_EVENT_IOC_ID, &fds[i].id);
			if (ret == -1)
				err(1, "cannot read ID");
			fprintf(options.output_file,"ID %"PRIu64"  %s\n", fds[i].id, fds[i].name);
		}
	}

	pollfds[0].fd = fds[0].fd;
	pollfds[0].events = POLLIN;
	
	for(i=0; i < num_fds; i++) {
		ret = ioctl(fds[i].fd, PERF_EVENT_IOC_ENABLE, 0);
		if (ret)
			err(1, "cannot enable event %s\n", fds[i].name);
	}
	signal(SIGCHLD, cld_handler);

	close(go[1]);

	if (setjmp(jbuf) == 1)
		goto terminate_session;

	sigemptyset(&bmask);
	sigaddset(&bmask, SIGCHLD);

	/*
	 * core loop
	 */
	for(;;) {
		ret = poll(pollfds, 1, -1);
		if (ret < 0 && errno == EINTR)
			break;
		ovfl_count++;
		ret = sigprocmask(SIG_SETMASK, &bmask, NULL);
		if (ret)
			err(1, "setmask");
		process_smpl_buf(&fds[0]);
		ret = sigprocmask(SIG_UNBLOCK, &bmask, NULL);
		if (ret)
			err(1, "unblock");
	}
	printf("How was you day??\n");
terminate_session:
	/*
	 * cleanup child
	 */
	wait4(pid, &status, 0, NULL);

	for(i=0; i < num_fds; i++)
		close(fds[i].fd);

	/* check for partial event buffer */
	process_smpl_buf(&fds[0]);
	munmap(fds[0].buf, map_size);

	perf_free_fds(fds, num_fds);

	fprintf(options.output_file,
		"%"PRIu64" samples collected in %"PRIu64" poll events, %"PRIu64" lost samples\n",
		collected_samples,
		ovfl_count, lost_samples);

	/* free libpfm resources cleanly */
	pfm_terminate();

	fclose(options.output_file);

	return 0;
}
Esempio n. 27
0
int
main(int argc, char **argv)
{
	pfarg_ctx_t ctx;
	pfarg_pmc_t pc[NUM_PMCS];
	pfarg_pmd_t *pd;
	pfmlib_input_param_t inp;
	pfmlib_output_param_t outp;
	uint64_t cpu_list;
	void *desc;
	unsigned int num_counters;
	uint32_t i, j, k, l, ncpus, npmds;
	size_t len;
	int ret;
	char *name;

	if (pfm_initialize() != PFMLIB_SUCCESS)
		fatal_error("cannot initialize libpfm\n");

	if (pfms_initialize())
		fatal_error("cannot initialize libpfms\n");

	pfm_get_num_counters(&num_counters);
	pfm_get_max_event_name_len(&len);

	name = malloc(len+1);
	if (name == NULL)
		fatal_error("cannot allocate memory for event name\n");

	memset(&ctx, 0, sizeof(ctx));
	memset(pc, 0, sizeof(pc));
	memset(&inp,0, sizeof(inp));
	memset(&outp,0, sizeof(outp));

	cpu_list = argc > 1 ? strtoul(argv[1], NULL, 0) : 0x3;

	ncpus = popcount(cpu_list);

		if (pfm_get_cycle_event(&inp.pfp_events[0].event) != PFMLIB_SUCCESS)
		fatal_error("cannot find cycle event\n");

	if (pfm_get_inst_retired_event(&inp.pfp_events[1].event) != PFMLIB_SUCCESS)
		fatal_error("cannot find inst retired event\n");

	i = 2;

	inp.pfp_dfl_plm = PFM_PLM3|PFM_PLM0;

	if (i > num_counters) {
		i = num_counters;
		printf("too many events provided (max=%d events), using first %d event(s)\n", num_counters, i);
	}
	/*
	 * how many counters we use
	 */
	inp.pfp_event_count = i;

	/*
	 * indicate we are using the monitors for a system-wide session.
	 * This may impact the way the library sets up the PMC values.
	 */
	inp.pfp_flags = PFMLIB_PFP_SYSTEMWIDE;

	/*
	 * let the library figure out the values for the PMCS
	 */
	if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS)
		fatal_error("cannot configure events: %s\n", pfm_strerror(ret));

	npmds = ncpus * inp.pfp_event_count;
	dprint("ncpus=%u npmds=%u\n", ncpus, npmds);

	pd = calloc(npmds, sizeof(pfarg_pmd_t));
	if (pd == NULL)
		fatal_error("cannot allocate pd array\n");

	for (i=0; i < outp.pfp_pmc_count; i++) {
		pc[i].reg_num   = outp.pfp_pmcs[i].reg_num;
		pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
	}

	for(l=0, k = 0; l < ncpus; l++) {
		for (i=0, j=0; i < inp.pfp_event_count; i++, k++) {
			pd[k].reg_num   = outp.pfp_pmcs[j].reg_pmd_num;
			for(; j < outp.pfp_pmc_count; j++)  if (outp.pfp_pmcs[j].reg_evt_idx != i) break;
		}
	}

	/*
	 * create a context on all CPUs we asked for
	 *
	 * libpfms only works for system-wide, so we set the flag in
	 * the master context. the context argument is not modified by
	 * call.
	 *
	 * desc is an opaque descriptor used to identify session.
	 */
	ctx.ctx_flags = PFM_FL_SYSTEM_WIDE;

	ret = pfms_create(&cpu_list, 1, &ctx, NULL, &desc);
	if (ret == -1)
		fatal_error("create error %d\n", ret);

	/*
	 * program the PMC registers on all CPUs of interest
	 */
	ret = pfms_write_pmcs(desc, pc, outp.pfp_pmc_count);
	if (ret == -1)
		fatal_error("write_pmcs error %d\n", ret);

	/*
	 * program the PMD registers on all CPUs of interest
	 */
	ret = pfms_write_pmds(desc, pd, inp.pfp_event_count);
	if (ret == -1)
		fatal_error("write_pmds error %d\n", ret);

	/*
	 * load context on all CPUs of interest
	 */
	ret = pfms_load(desc);
	if (ret == -1)
		fatal_error("load error %d\n", ret);

	/*
	 * start monitoring on all CPUs of interest
	 */
	ret = pfms_start(desc);
	if (ret == -1)
		fatal_error("start error %d\n", ret);

	/*
	 * simulate some work
	 */
	sleep(10);

	/*
	 * stop monitoring on all CPUs of interest
	 */
	ret = pfms_stop(desc);
	if (ret == -1)
		fatal_error("stop error %d\n", ret);
	
	/*
	 * read the PMD registers on all CPUs of interest.
	 * The pd[] array must be organized such that to
	 * read 2 PMDs on each CPU you need:
	 * 	- 2 * number of CPUs of interest
	 * 	- the first 2 elements of pd[] read on 1st CPU
	 * 	- the next  2 elements of pd[] read on the 2nd CPU
	 * 	- and so on
	 */
	ret = pfms_read_pmds(desc, pd, npmds);
	if (ret == -1)
		fatal_error("read_pmds error %d\n", ret);

	/*
	 * pre per-CPU results
	 */
	for(j=0, k= 0; j < ncpus; j++) {
		for (i=0; i < inp.pfp_event_count; i++, k++) {
			pfm_get_full_event_name(&inp.pfp_events[i], name, len);
			printf("CPU%-3d PMD%u %20"PRIu64" %s\n",
			j,
			pd[k].reg_num,
			pd[k].reg_value,
			name);
		}
	}

	/*
	 * destroy context  on all CPUs of interest.
	 * After this call desc is invalid
	 */
	ret = pfms_close(desc);
	if (ret == -1)
		fatal_error("close error %d\n", ret);

	free(name);

	return 0;
}
Esempio n. 28
0
int
main(int argc, char **argv)
{
	int c, ret;

	setlocale(LC_ALL, "");

	options.cpu = -1;

	while ((c=getopt(argc, argv,"hc:e:d:xPpG:")) != -1) {
		switch(c) {
			case 'x':
				options.excl = 1;
				break;
 			case 'p':
 				options.interval = 1;
 				break;
			case 'e':
				if (options.num_groups < MAX_GROUPS) {
					options.events[options.num_groups++] = optarg;
				} else {
					errx(1, "you cannot specify more than %d groups.\n",
						MAX_GROUPS);
				}
				break;
			case 'c':
				options.cpu = atoi(optarg);
				break;
			case 'd':
				options.delay = atoi(optarg);
				break;
			case 'P':
				options.pin = 1;
				break;
			case 'h':
				usage();
				exit(0);
			case 'G':
				options.cgroup_name = optarg;
				break;
			default:
				errx(1, "unknown error");
		}
	}
	if (!options.delay)
		options.delay = 20;

	if (!options.events[0]) {
		options.events[0] = "cycles,instructions";
		options.num_groups = 1;
	}

	ret = pfm_initialize();
	if (ret != PFM_SUCCESS)
		errx(1, "libpfm initialization failed: %s\n", pfm_strerror(ret));
	
	measure();

	/* free libpfm resources cleanly */
	pfm_terminate();

	return 0;
}
Esempio n. 29
0
int
main(int argc, char **argv)
{
	static char *argv_all[2] = { ".*", NULL };
	char *endptr = NULL;
	char **args;
	int c, match;
	regex_t preg;
	char model[MAX_PMU_NAME_LEN];

	while ((c=getopt(argc, argv,"hsm:")) != -1) {
		switch(c) {
			case 's':
				options.sort = 1;
				break;
			case 'm':
				options.mask = strtoull(optarg, &endptr, 16);
				if (*endptr)
					fatal_error("mask must be in hexadecimal\n");
				break;
			case 'h':
				usage();
				exit(0);
			default:
				fatal_error("unknown error");
		}
	}

	if (pfm_initialize() != PFMLIB_SUCCESS)
		fatal_error("PMU model not supported by library\n");

	if (options.mask == 0)
		options.mask = ~0;

	if (optind == argc) {
		args = argv_all;
	} else {
		args = argv + optind;
	}

	pfm_get_max_event_name_len(&max_len);
	name = malloc(max_len+1);
	if (name == NULL)
		fatal_error("cannot allocate name buffer\n");

	if (argc == 1)
		*argv = ".*"; /* match everything */
	else
		++argv;

	pfm_get_pmu_name(model, MAX_PMU_NAME_LEN);
	printf("PMU model: %s\n", model);

	while(*args) {
		if (regcomp(&preg, *args, REG_ICASE|REG_NOSUB))
			fatal_error("error in regular expression for event \"%s\"", *argv);

		if (options.sort)
			match = show_info_sorted(&preg);
		else
			match = show_info(&preg);

		if (match == 0)
			fatal_error("event %s not found", *args);

		args++;
	}

	regfree(&preg);
	free(name);

	return 0;
}