static void
sigio_handler(int n)
{
pfarg_msg_t msg;
int fd = ctx_fd;
int r;
if (event1_name && pfm_read_pmds(fd, pd+1, 1) == -1)
fatal_error("pfm_read_pmds: %s", strerror(errno));
retry:
r = read(fd, &msg, sizeof(msg));
if (r != sizeof(msg)) {
if(r == -1 && errno == EINTR) {
warning("read interrupted, retrying\n");
goto retry;
}
fatal_error("cannot read overflow message: %s\n", strerror(errno));
}
if (msg.type != PFM_MSG_OVFL)
fatal_error("unexpected msg type: %d\n",msg.type);
/*
* increment our notification counter
*/
notification_received++;
/*
* XXX: risky to do printf() in signal handler!
*/
if (event1_name)
printf("Notification %lu: %"PRIu64" %s ip=0x%llx\n",
notification_received, pd[1].reg_value,
event1_name,
(unsigned long long)msg.pfm_ovfl_msg.msg_ovfl_ip);
else
printf("Notification %lu ip=0x%llx\n",
notification_received,
(unsigned long long)msg.pfm_ovfl_msg.msg_ovfl_ip);
/*
* And resume monitoring
*/
if (pfm_restart(fd) == -1)
fatal_error("pfm_restart: %d\n", errno);
}
/**
* restart_counting
*
* Arguments: <context_id>
*
* Call the pfm_restart system-call to clear the data counters and start
* counting from zero for a perfmon context that was previously loaded.
**/
static int restart_counting(int argc, char **argv)
{
struct context *ctx;
cpu_set_t old_cpu_set;
int system_wide;
int ctx_id;
int rc;
ctx_id = strtoul(argv[1], NULL, 0);
if (ctx_id <= 0) {
LOG_ERROR("context ID must be a positive integer.");
return EINVAL;
}
ctx = find_context(ctx_id);
if (!ctx) {
LOG_ERROR("Can't find context with ID %d.", ctx_id);
return EINVAL;
}
system_wide = ctx->ctx_arg.ctx_flags & PFM_FL_SYSTEM_WIDE;
if (system_wide && ctx->cpu >= 0) {
rc = set_affinity(ctx->cpu, &old_cpu_set);
if (rc) {
return rc;
}
}
rc = pfm_restart(ctx->fd);
if (rc) {
rc = errno;
LOG_ERROR("pfm_restart system call returned an error: %d.", rc);
return rc;
}
if (system_wide && ctx->cpu >= 0) {
revert_affinity(&old_cpu_set);
}
LOG_INFO("Restarted counting for context %d.", ctx_id);
return 0;
}