/*
* set one of scalling_min_freq, scaling_max_freq, scaling_setspeed
* -- assume governor already set to userspace ---
*
*/
static int
_cpu_freq_set_scaling_freq(stepd_step_rec_t *job, int cpx, uint32_t freq,
char* option)
{
char path[SYSFS_PATH_MAX];
FILE *fp;
int fd, rc;
uint32_t newfreq;
rc = SLURM_SUCCESS;
snprintf(path, sizeof(path), PATH_TO_CPU
"cpu%u/cpufreq/%s", cpx, option);
fd = _set_cpu_owner_lock(cpx, job->jobid);
if ((fp = fopen(path, "w"))) {
fprintf(fp, "%u\n", freq);
fclose(fp);
} else {
error("%s: Can not set %s: %m", __func__, option);
rc = SLURM_FAILURE;
}
(void) close(fd);
if (debug_flags & DEBUG_FLAG_CPU_FREQ) {
newfreq = _cpu_freq_get_scaling_freq(cpx, option);
if (newfreq != freq) {
error("Failed to set freq_scaling %s to %u (org=%u)",
option, freq, newfreq);
}
}
return rc;
}
/*
* set cpu governor
*/
static int
_cpu_freq_set_gov(stepd_step_rec_t *job, int cpuidx, char* gov )
{
char path[PATH_MAX];
FILE *fp;
int fd, rc;
rc = SLURM_SUCCESS;
snprintf(path, sizeof(path), PATH_TO_CPU
"cpu%u/cpufreq/scaling_governor", cpuidx);
fd = _set_cpu_owner_lock(cpuidx, job->jobid);
if ((fp = fopen(path, "w"))) {
fputs(gov, fp);
fputc('\n', fp);
fclose(fp);
} else {
error("%s: Can not set CPU governor: %m", __func__);
rc = SLURM_FAILURE;
}
if (fd >= 0) {
(void) fd_release_lock(fd);
(void) close(fd);
}
return rc;
}