/*
* Get current state
*
* IN: cpuidx - cpu to query
* Return: SLURM_SUCCESS or SLURM_FAILURE
*/
static int
_cpu_freq_current_state(int cpuidx)
{
uint32_t freq;
/*
* Getting 'previous' values using the 'scaling' values rather
* than the 'cpuinfo' values.
* The 'cpuinfo' values are read only. min/max seem to be raw
* hardware capability.
* The 'scaling' values are set by the governor
*/
freq = _cpu_freq_get_scaling_freq(cpuidx, "scaling_cur_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_frequency = freq;
freq = _cpu_freq_get_scaling_freq(cpuidx, "scaling_min_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_min_freq = freq;
freq = _cpu_freq_get_scaling_freq(cpuidx, "scaling_max_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_max_freq = freq;
return _cpu_freq_get_cur_gov(cpuidx);
}
/*
* 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;
}
/*
* Get current state
*
* IN: cpuidx - cpu to query
* Return: SLURM_SUCCESS or SLURM_FAILURE
*/
static int
_cpu_freq_current_state(int cpuidx)
{
uint32_t freq;
if (cpufreq[cpuidx].org_set) {
/*
* The current state was already loaded for this cpu.
* Likely caused by stacked task plugins. Prevent
* overwriting the original values so they can be
* restored correctly after job completion.
*/
return SLURM_SUCCESS;
}
/*
* Getting 'previous' values using the 'scaling' values rather
* than the 'cpuinfo' values.
* The 'cpuinfo' values are read only. min/max seem to be raw
* hardware capability.
* The 'scaling' values are set by the governor.
* For the current frequency, use the cpuinfo_cur_freq file
* since the intel_pstate driver doesn't necessarily create
* the scaling_cur_freq file.
*/
freq = _cpu_freq_get_scaling_freq(cpuidx, "cpuinfo_cur_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_frequency = freq;
freq = _cpu_freq_get_scaling_freq(cpuidx, "scaling_min_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_min_freq = freq;
freq = _cpu_freq_get_scaling_freq(cpuidx, "scaling_max_freq");
if (freq == 0)
return SLURM_FAILURE;
cpufreq[cpuidx].org_max_freq = freq;
if (_cpu_freq_get_cur_gov(cpuidx) == SLURM_SUCCESS) {
cpufreq[cpuidx].org_set = true;
return SLURM_SUCCESS;
} else {
return SLURM_FAILURE;
}
}
