//! Configure and start counters
static int intel_snb_pcu_begin(struct stats_type *type)
{
int nr = 0;
uint64_t pcu_events[4] = {
FREQ_MAX_TEMP_CYCLES,
FREQ_MAX_POWER_CYCLES,
FREQ_MIN_IO_CYCLES,
FREQ_MIN_SNOOP_CYCLES
};
int i;
for (i = 0; i < nr_cpus; i++) {
char cpu[80];
int pkg_id = -1;
int core_id = -1;
int smt_id = -1;
int nr_events;
int nr_cores = 0;
snprintf(cpu, sizeof(cpu), "%d", i);
if (signature(SANDYBRIDGE, cpu, &nr_events)) {
topology(cpu, &pkg_id, &core_id, &smt_id, &nr_cores);
if (core_id == 0 && smt_id == 0)
if (intel_snb_pcu_begin_socket(cpu, pcu_events,4) == 0)
nr++;
}
}
if (nr == 0)
type->st_enabled = 0;
return nr > 0 ? 0 : -1;
}
//! Configure and start counters
static int intel_snb_pcu_begin(struct stats_type *type)
{
int nr = 0;
uint64_t pcu_events[4] = {FREQ_MAX_TEMP_CYCLES,
FREQ_MAX_POWER_CYCLES,
FREQ_MIN_IO_CYCLES,
FREQ_MIN_SNOOP_CYCLES
};
int i;
for (i = 0; i < nr_cpus; i++) {
char cpu[80];
char core_id_path[80];
int core_id = -1;
/* Only program uncore counters on core 0 of a socket. */
snprintf(core_id_path, sizeof(core_id_path), "/sys/devices/system/cpu/cpu%d/topology/core_id", i);
if (pscanf(core_id_path, "%d", &core_id) != 1) {
ERROR("cannot read core id file `%s': %m\n", core_id_path); /* errno */
continue;
}
if (core_id != 0)
continue;
snprintf(cpu, sizeof(cpu), "%d", i);
if (cpu_is_sandybridge(cpu))
{
if (intel_snb_pcu_begin_socket(cpu, pcu_events,4) == 0)
nr++; /* HARD */
}
}
return nr > 0 ? 0 : -1;
}