static int rdt_default_cgroups(void) {
unsigned num_cores = g_rdt->pqos_cpu->num_cores;
g_rdt->cores.cgroups = calloc(num_cores, sizeof(*g_rdt->cores.cgroups));
if (g_rdt->cores.cgroups == NULL) {
ERROR(RDT_PLUGIN ": Error allocating core groups array");
return -ENOMEM;
}
g_rdt->cores.num_cgroups = num_cores;
/* configure each core in separate group */
for (unsigned i = 0; i < num_cores; i++) {
core_group_t *cgroup = g_rdt->cores.cgroups + i;
char desc[DATA_MAX_NAME_LEN];
/* set core group info */
cgroup->cores = calloc(1, sizeof(*cgroup->cores));
if (cgroup->cores == NULL) {
ERROR(RDT_PLUGIN ": Error allocating cores array");
rdt_free_cgroups();
return -ENOMEM;
}
cgroup->num_cores = 1;
cgroup->cores[0] = i;
snprintf(desc, sizeof(desc), "%d", g_rdt->pqos_cpu->cores[i].lcore);
cgroup->desc = strdup(desc);
if (cgroup->desc == NULL) {
ERROR(RDT_PLUGIN ": Error allocating core group description");
rdt_free_cgroups();
return -ENOMEM;
}
}
return num_cores;
}
static int rdt_config_cgroups(oconfig_item_t *item) {
int n = 0;
enum pqos_mon_event events = 0;
if (item == NULL) {
DEBUG(RDT_PLUGIN ": cgroups_config: Invalid argument.");
return (-EINVAL);
}
DEBUG(RDT_PLUGIN ": Core groups [%d]:", item->values_num);
for (int j = 0; j < item->values_num; j++) {
if (item->values[j].type != OCONFIG_TYPE_STRING) {
ERROR(RDT_PLUGIN ": given core group value is not a string [idx=%d]", j);
return (-EINVAL);
}
DEBUG(RDT_PLUGIN ": [%d]: %s", j, item->values[j].value.string);
}
n = oconfig_to_cgroups(item, g_rdt->cgroups, RDT_MAX_CORES,
g_rdt->pqos_cpu->num_cores - 1);
if (n < 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Error parsing core groups configuration.");
return (-EINVAL);
}
if (n == 0) {
/* create default core groups if "Cores" config option is empty */
n = rdt_default_cgroups();
if (n < 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Error creating default core groups configuration.");
return n;
}
INFO(RDT_PLUGIN
": No core groups configured. Default core groups created.");
}
/* Get all available events on this platform */
for (int i = 0; i < g_rdt->cap_mon->u.mon->num_events; i++)
events |= g_rdt->cap_mon->u.mon->events[i].type;
events &= ~(PQOS_PERF_EVENT_LLC_MISS);
DEBUG(RDT_PLUGIN ": Number of cores in the system: %u",
g_rdt->pqos_cpu->num_cores);
DEBUG(RDT_PLUGIN ": Available events to monitor: %#x", events);
g_rdt->num_groups = n;
for (int i = 0; i < n; i++) {
for (int j = 0; j < i; j++) {
int found = 0;
found = cgroup_cmp(&g_rdt->cgroups[j], &g_rdt->cgroups[i]);
if (found != 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Cannot monitor same cores in different groups.");
return (-EINVAL);
}
}
g_rdt->cgroups[i].events = events;
g_rdt->pgroups[i] = calloc(1, sizeof(*g_rdt->pgroups[i]));
if (g_rdt->pgroups[i] == NULL) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Failed to allocate memory for monitoring data.");
return (-ENOMEM);
}
}
return (0);
}
static int rdt_config_cgroups(oconfig_item_t *item) {
size_t n = 0;
enum pqos_mon_event events = 0;
if (config_cores_parse(item, &g_rdt->cores) < 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Error parsing core groups configuration.");
return -EINVAL;
}
n = g_rdt->cores.num_cgroups;
/* validate configured core id values */
for (size_t group_idx = 0; group_idx < n; group_idx++) {
core_group_t *cgroup = g_rdt->cores.cgroups + group_idx;
for (size_t core_idx = 0; core_idx < cgroup->num_cores; core_idx++) {
if (!rdt_is_core_id_valid(cgroup->cores[core_idx])) {
ERROR(RDT_PLUGIN ": Core group '%s' contains invalid core id '%u'",
cgroup->desc, cgroup->cores[core_idx]);
rdt_free_cgroups();
return -EINVAL;
}
}
}
if (n == 0) {
/* create default core groups if "Cores" config option is empty */
int ret = rdt_default_cgroups();
if (ret < 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Error creating default core groups configuration.");
return ret;
}
n = (size_t)ret;
INFO(RDT_PLUGIN
": No core groups configured. Default core groups created.");
}
/* Get all available events on this platform */
for (unsigned int i = 0; i < g_rdt->cap_mon->u.mon->num_events; i++)
events |= g_rdt->cap_mon->u.mon->events[i].type;
events &= ~(PQOS_PERF_EVENT_LLC_MISS);
DEBUG(RDT_PLUGIN ": Number of cores in the system: %u",
g_rdt->pqos_cpu->num_cores);
DEBUG(RDT_PLUGIN ": Available events to monitor: %#x", events);
g_rdt->num_groups = n;
for (size_t i = 0; i < n; i++) {
for (size_t j = 0; j < i; j++) {
int found = 0;
found = config_cores_cmp_cgroups(&g_rdt->cores.cgroups[j],
&g_rdt->cores.cgroups[i]);
if (found != 0) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Cannot monitor same cores in different groups.");
return -EINVAL;
}
}
g_rdt->events[i] = events;
g_rdt->pgroups[i] = calloc(1, sizeof(*g_rdt->pgroups[i]));
if (g_rdt->pgroups[i] == NULL) {
rdt_free_cgroups();
ERROR(RDT_PLUGIN ": Failed to allocate memory for monitoring data.");
return -ENOMEM;
}
}
return 0;
}