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;
}
void
measure(void)
{
int c, cmin, cmax, ncpus;
int cfd = -1;
cmin = 0;
cmax = (int)sysconf(_SC_NPROCESSORS_ONLN);
ncpus = cmax;
if (options.cpu != -1) {
cmin = options.cpu;
cmax = cmin + 1;
}
all_fds = malloc(ncpus * sizeof(perf_event_desc_t *));
if (!all_fds)
err(1, "cannot allocate memory for all_fds");
if (options.cgroup_name) {
cfd = open_cgroup(options.cgroup_name);
if (cfd == -1)
exit(1);
}
for(c=cmin ; c < cmax; c++)
setup_cpu(c, cfd);
printf("<press CTRL-C to quit before %ds time limit>\n", options.delay);
/*
* FIX this for hotplug CPU
*/
if (options.interval) {
struct timespec tv;
int delay;
for (delay = 1 ; delay <= options.delay; delay++) {
for(c=cmin ; c < cmax; c++)
start_cpu(c);
if (0) {
tv.tv_sec = 0;
tv.tv_nsec = 100000000;
nanosleep(&tv, NULL);
} else
sleep(1);
for(c=cmin ; c < cmax; c++)
stop_cpu(c);
for(c = cmin; c < cmax; c++) {
printf("# %'ds -----\n", delay);
read_cpu(c);
}
}
} else {
for(c=cmin ; c < cmax; c++)
start_cpu(c);
sleep(options.delay);
if (0)
for(c=cmin ; c < cmax; c++)
stop_cpu(c);
for(c = cmin; c < cmax; c++) {
printf("# -----\n");
read_cpu(c);
}
}
for(c = cmin; c < cmax; c++)
close_cpu(c);
free(all_fds);
}
