static void
sigio_handler(int n, siginfo_t *info, void *uc)
{
struct perf_event_header ehdr;
int ret, id;
/*
* positive si_code indicate kernel generated signal
* which is normal for SIGIO
*/
if (info->si_code < 0)
errx(1, "signal not generated by kernel");
/*
* SIGPOLL = SIGIO
* expect POLL_HUP instead of POLL_IN because we are
* in one-shot mode (IOC_REFRESH)
*/
if (info->si_code != POLL_HUP)
errx(1, "signal not generated by SIGIO");
id = perf_fd2event(fds, num_fds, info->si_fd);
if (id == -1)
errx(1, "no event associated with fd=%d", info->si_fd);
ret = perf_read_buffer(fds+id, &ehdr, sizeof(ehdr));
if (ret)
errx(1, "cannot read event header");
if (ehdr.type != PERF_RECORD_SAMPLE) {
warnx("unexpected sample type=%d, skipping\n", ehdr.type);
perf_skip_buffer(fds+id, ehdr.size);
goto skip;
}
printf("Notification:%lu ", notification_received);
ret = perf_display_sample(fds, num_fds, 0, &ehdr, stdout);
/*
* increment our notification counter
*/
notification_received++;
skip:
/*
* rearm the counter for one more shot
*/
ret = ioctl(info->si_fd, PERF_EVENT_IOC_REFRESH, 1);
if (ret == -1)
err(1, "cannot refresh");
}
static void
process_smpl_buf(perf_event_desc_t *hw)
{
struct perf_event_header ehdr;
int ret;
for(;;) {
ret = perf_read_buffer(hw, &ehdr, sizeof(ehdr));
if (ret)
return; /* nothing to read */
if (options.opt_no_show) {
perf_skip_buffer(hw, ehdr.size - sizeof(ehdr));
continue;
}
switch(ehdr.type) {
case PERF_RECORD_SAMPLE:
collected_samples++;
ret = perf_display_sample(fds, num_fds, hw - fds, &ehdr, options.output_file);
if (ret)
errx(1, "cannot parse sample");
break;
case PERF_RECORD_EXIT:
display_exit(hw, options.output_file);
break;
case PERF_RECORD_LOST:
lost_samples += display_lost(hw, fds, num_fds, options.output_file);
break;
case PERF_RECORD_THROTTLE:
display_freq(1, hw, options.output_file);
break;
case PERF_RECORD_UNTHROTTLE:
display_freq(0, hw, options.output_file);
break;
default:
printf("unknown sample type %d\n", ehdr.type);
perf_skip_buffer(hw, ehdr.size - sizeof(ehdr));
}
}
}
static void
process_smpl_buf(perf_event_desc_t *hw)
{
struct perf_event_header ehdr;
int ret;
for(;;) {
ret = perf_read_buffer(hw->buf, hw->pgmsk, &ehdr, sizeof(ehdr));
if (ret)
return; /* nothing to read */
switch(ehdr.type) {
case PERF_RECORD_SAMPLE:
ret = perf_display_sample(fds, num_fds, hw - fds, &ehdr, stdout);
if (ret)
errx(1, "cannot parse sample");
collected_samples++;
break;
case PERF_RECORD_EXIT:
display_exit(hw);
break;
case PERF_RECORD_LOST:
display_lost(hw);
break;
case PERF_RECORD_THROTTLE:
display_freq(1, hw);
break;
case PERF_RECORD_UNTHROTTLE:
display_freq(0, hw);
break;
default:
printf("unknown sample type %d\n", ehdr.type);
perf_skip_buffer(hw->buf, ehdr.size - sizeof(ehdr));
}
}
}
