571 lines
11 KiB
C
571 lines
11 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <api/fs/fs.h>
|
||
|
|
#include "cpumap.h"
|
||
|
|
#include "debug.h"
|
||
|
|
#include "event.h"
|
||
|
|
#include <assert.h>
|
||
|
|
#include <dirent.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <linux/bitmap.h>
|
||
|
|
#include "asm/bug.h"
|
||
|
|
|
||
|
|
#include <linux/ctype.h>
|
||
|
|
#include <linux/zalloc.h>
|
||
|
|
|
||
|
|
static int max_cpu_num;
|
||
|
|
static int max_present_cpu_num;
|
||
|
|
static int max_node_num;
|
||
|
|
static int *cpunode_map;
|
||
|
|
|
||
|
|
static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
|
||
|
|
{
|
||
|
|
struct perf_cpu_map *map;
|
||
|
|
|
||
|
|
map = perf_cpu_map__empty_new(cpus->nr);
|
||
|
|
if (map) {
|
||
|
|
unsigned i;
|
||
|
|
|
||
|
|
for (i = 0; i < cpus->nr; i++) {
|
||
|
|
/*
|
||
|
|
* Special treatment for -1, which is not real cpu number,
|
||
|
|
* and we need to use (int) -1 to initialize map[i],
|
||
|
|
* otherwise it would become 65535.
|
||
|
|
*/
|
||
|
|
if (cpus->cpu[i] == (u16) -1)
|
||
|
|
map->map[i] = -1;
|
||
|
|
else
|
||
|
|
map->map[i] = (int) cpus->cpu[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return map;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
|
||
|
|
{
|
||
|
|
struct perf_cpu_map *map;
|
||
|
|
int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
|
||
|
|
|
||
|
|
nr = bitmap_weight(mask->mask, nbits);
|
||
|
|
|
||
|
|
map = perf_cpu_map__empty_new(nr);
|
||
|
|
if (map) {
|
||
|
|
int cpu, i = 0;
|
||
|
|
|
||
|
|
for_each_set_bit(cpu, mask->mask, nbits)
|
||
|
|
map->map[i++] = cpu;
|
||
|
|
}
|
||
|
|
return map;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
|
||
|
|
{
|
||
|
|
if (data->type == PERF_CPU_MAP__CPUS)
|
||
|
|
return cpu_map__from_entries((struct cpu_map_entries *)data->data);
|
||
|
|
else
|
||
|
|
return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
|
||
|
|
{
|
||
|
|
#define BUFSIZE 1024
|
||
|
|
char buf[BUFSIZE];
|
||
|
|
|
||
|
|
cpu_map__snprint(map, buf, sizeof(buf));
|
||
|
|
return fprintf(fp, "%s\n", buf);
|
||
|
|
#undef BUFSIZE
|
||
|
|
}
|
||
|
|
|
||
|
|
struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
|
||
|
|
{
|
||
|
|
struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
|
||
|
|
|
||
|
|
if (cpus != NULL) {
|
||
|
|
int i;
|
||
|
|
|
||
|
|
cpus->nr = nr;
|
||
|
|
for (i = 0; i < nr; i++)
|
||
|
|
cpus->map[i] = -1;
|
||
|
|
|
||
|
|
refcount_set(&cpus->refcnt, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
return cpus;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cpu__get_topology_int(int cpu, const char *name, int *value)
|
||
|
|
{
|
||
|
|
char path[PATH_MAX];
|
||
|
|
|
||
|
|
snprintf(path, PATH_MAX,
|
||
|
|
"devices/system/cpu/cpu%d/topology/%s", cpu, name);
|
||
|
|
|
||
|
|
return sysfs__read_int(path, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_socket_id(int cpu)
|
||
|
|
{
|
||
|
|
int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
|
||
|
|
return ret ?: value;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
|
||
|
|
{
|
||
|
|
int cpu;
|
||
|
|
|
||
|
|
if (idx > map->nr)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
cpu = map->map[idx];
|
||
|
|
|
||
|
|
return cpu_map__get_socket_id(cpu);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cmp_ids(const void *a, const void *b)
|
||
|
|
{
|
||
|
|
return *(int *)a - *(int *)b;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
|
||
|
|
int (*f)(struct perf_cpu_map *map, int cpu, void *data),
|
||
|
|
void *data)
|
||
|
|
{
|
||
|
|
struct perf_cpu_map *c;
|
||
|
|
int nr = cpus->nr;
|
||
|
|
int cpu, s1, s2;
|
||
|
|
|
||
|
|
/* allocate as much as possible */
|
||
|
|
c = calloc(1, sizeof(*c) + nr * sizeof(int));
|
||
|
|
if (!c)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
for (cpu = 0; cpu < nr; cpu++) {
|
||
|
|
s1 = f(cpus, cpu, data);
|
||
|
|
for (s2 = 0; s2 < c->nr; s2++) {
|
||
|
|
if (s1 == c->map[s2])
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (s2 == c->nr) {
|
||
|
|
c->map[c->nr] = s1;
|
||
|
|
c->nr++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* ensure we process id in increasing order */
|
||
|
|
qsort(c->map, c->nr, sizeof(int), cmp_ids);
|
||
|
|
|
||
|
|
refcount_set(&c->refcnt, 1);
|
||
|
|
*res = c;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_die_id(int cpu)
|
||
|
|
{
|
||
|
|
int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
|
||
|
|
|
||
|
|
return ret ?: value;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
|
||
|
|
{
|
||
|
|
int cpu, die_id, s;
|
||
|
|
|
||
|
|
if (idx > map->nr)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
cpu = map->map[idx];
|
||
|
|
|
||
|
|
die_id = cpu_map__get_die_id(cpu);
|
||
|
|
/* There is no die_id on legacy system. */
|
||
|
|
if (die_id == -1)
|
||
|
|
die_id = 0;
|
||
|
|
|
||
|
|
s = cpu_map__get_socket(map, idx, data);
|
||
|
|
if (s == -1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Encode socket in bit range 15:8
|
||
|
|
* die_id is relative to socket, and
|
||
|
|
* we need a global id. So we combine
|
||
|
|
* socket + die id
|
||
|
|
*/
|
||
|
|
if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return (s << 8) | (die_id & 0xff);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_core_id(int cpu)
|
||
|
|
{
|
||
|
|
int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
|
||
|
|
return ret ?: value;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
|
||
|
|
{
|
||
|
|
int cpu, s_die;
|
||
|
|
|
||
|
|
if (idx > map->nr)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
cpu = map->map[idx];
|
||
|
|
|
||
|
|
cpu = cpu_map__get_core_id(cpu);
|
||
|
|
|
||
|
|
/* s_die is the combination of socket + die id */
|
||
|
|
s_die = cpu_map__get_die(map, idx, data);
|
||
|
|
if (s_die == -1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* encode socket in bit range 31:24
|
||
|
|
* encode die id in bit range 23:16
|
||
|
|
* core_id is relative to socket and die,
|
||
|
|
* we need a global id. So we combine
|
||
|
|
* socket + die id + core id
|
||
|
|
*/
|
||
|
|
if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return (s_die << 16) | (cpu & 0xffff);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
|
||
|
|
{
|
||
|
|
return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
|
||
|
|
{
|
||
|
|
return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
|
||
|
|
{
|
||
|
|
return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* setup simple routines to easily access node numbers given a cpu number */
|
||
|
|
static int get_max_num(char *path, int *max)
|
||
|
|
{
|
||
|
|
size_t num;
|
||
|
|
char *buf;
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
if (filename__read_str(path, &buf, &num))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
buf[num] = '\0';
|
||
|
|
|
||
|
|
/* start on the right, to find highest node num */
|
||
|
|
while (--num) {
|
||
|
|
if ((buf[num] == ',') || (buf[num] == '-')) {
|
||
|
|
num++;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (sscanf(&buf[num], "%d", max) < 1) {
|
||
|
|
err = -1;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* convert from 0-based to 1-based */
|
||
|
|
(*max)++;
|
||
|
|
|
||
|
|
out:
|
||
|
|
free(buf);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine highest possible cpu in the system for sparse allocation */
|
||
|
|
static void set_max_cpu_num(void)
|
||
|
|
{
|
||
|
|
const char *mnt;
|
||
|
|
char path[PATH_MAX];
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
/* set up default */
|
||
|
|
max_cpu_num = 4096;
|
||
|
|
max_present_cpu_num = 4096;
|
||
|
|
|
||
|
|
mnt = sysfs__mountpoint();
|
||
|
|
if (!mnt)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* get the highest possible cpu number for a sparse allocation */
|
||
|
|
ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
|
||
|
|
if (ret == PATH_MAX) {
|
||
|
|
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = get_max_num(path, &max_cpu_num);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* get the highest present cpu number for a sparse allocation */
|
||
|
|
ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
|
||
|
|
if (ret == PATH_MAX) {
|
||
|
|
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = get_max_num(path, &max_present_cpu_num);
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (ret)
|
||
|
|
pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine highest possible node in the system for sparse allocation */
|
||
|
|
static void set_max_node_num(void)
|
||
|
|
{
|
||
|
|
const char *mnt;
|
||
|
|
char path[PATH_MAX];
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
/* set up default */
|
||
|
|
max_node_num = 8;
|
||
|
|
|
||
|
|
mnt = sysfs__mountpoint();
|
||
|
|
if (!mnt)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* get the highest possible cpu number for a sparse allocation */
|
||
|
|
ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
|
||
|
|
if (ret == PATH_MAX) {
|
||
|
|
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = get_max_num(path, &max_node_num);
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (ret)
|
||
|
|
pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu__max_node(void)
|
||
|
|
{
|
||
|
|
if (unlikely(!max_node_num))
|
||
|
|
set_max_node_num();
|
||
|
|
|
||
|
|
return max_node_num;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu__max_cpu(void)
|
||
|
|
{
|
||
|
|
if (unlikely(!max_cpu_num))
|
||
|
|
set_max_cpu_num();
|
||
|
|
|
||
|
|
return max_cpu_num;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu__max_present_cpu(void)
|
||
|
|
{
|
||
|
|
if (unlikely(!max_present_cpu_num))
|
||
|
|
set_max_cpu_num();
|
||
|
|
|
||
|
|
return max_present_cpu_num;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int cpu__get_node(int cpu)
|
||
|
|
{
|
||
|
|
if (unlikely(cpunode_map == NULL)) {
|
||
|
|
pr_debug("cpu_map not initialized\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return cpunode_map[cpu];
|
||
|
|
}
|
||
|
|
|
||
|
|
static int init_cpunode_map(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
set_max_cpu_num();
|
||
|
|
set_max_node_num();
|
||
|
|
|
||
|
|
cpunode_map = calloc(max_cpu_num, sizeof(int));
|
||
|
|
if (!cpunode_map) {
|
||
|
|
pr_err("%s: calloc failed\n", __func__);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < max_cpu_num; i++)
|
||
|
|
cpunode_map[i] = -1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu__setup_cpunode_map(void)
|
||
|
|
{
|
||
|
|
struct dirent *dent1, *dent2;
|
||
|
|
DIR *dir1, *dir2;
|
||
|
|
unsigned int cpu, mem;
|
||
|
|
char buf[PATH_MAX];
|
||
|
|
char path[PATH_MAX];
|
||
|
|
const char *mnt;
|
||
|
|
int n;
|
||
|
|
|
||
|
|
/* initialize globals */
|
||
|
|
if (init_cpunode_map())
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
mnt = sysfs__mountpoint();
|
||
|
|
if (!mnt)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
|
||
|
|
if (n == PATH_MAX) {
|
||
|
|
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
dir1 = opendir(path);
|
||
|
|
if (!dir1)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* walk tree and setup map */
|
||
|
|
while ((dent1 = readdir(dir1)) != NULL) {
|
||
|
|
if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
|
||
|
|
if (n == PATH_MAX) {
|
||
|
|
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
dir2 = opendir(buf);
|
||
|
|
if (!dir2)
|
||
|
|
continue;
|
||
|
|
while ((dent2 = readdir(dir2)) != NULL) {
|
||
|
|
if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
|
||
|
|
continue;
|
||
|
|
cpunode_map[cpu] = mem;
|
||
|
|
}
|
||
|
|
closedir(dir2);
|
||
|
|
}
|
||
|
|
closedir(dir1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
|
||
|
|
{
|
||
|
|
return perf_cpu_map__idx(cpus, cpu) != -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
|
||
|
|
{
|
||
|
|
return cpus->map[idx];
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
|
||
|
|
{
|
||
|
|
int i, cpu, start = -1;
|
||
|
|
bool first = true;
|
||
|
|
size_t ret = 0;
|
||
|
|
|
||
|
|
#define COMMA first ? "" : ","
|
||
|
|
|
||
|
|
for (i = 0; i < map->nr + 1; i++) {
|
||
|
|
bool last = i == map->nr;
|
||
|
|
|
||
|
|
cpu = last ? INT_MAX : map->map[i];
|
||
|
|
|
||
|
|
if (start == -1) {
|
||
|
|
start = i;
|
||
|
|
if (last) {
|
||
|
|
ret += snprintf(buf + ret, size - ret,
|
||
|
|
"%s%d", COMMA,
|
||
|
|
map->map[i]);
|
||
|
|
}
|
||
|
|
} else if (((i - start) != (cpu - map->map[start])) || last) {
|
||
|
|
int end = i - 1;
|
||
|
|
|
||
|
|
if (start == end) {
|
||
|
|
ret += snprintf(buf + ret, size - ret,
|
||
|
|
"%s%d", COMMA,
|
||
|
|
map->map[start]);
|
||
|
|
} else {
|
||
|
|
ret += snprintf(buf + ret, size - ret,
|
||
|
|
"%s%d-%d", COMMA,
|
||
|
|
map->map[start], map->map[end]);
|
||
|
|
}
|
||
|
|
first = false;
|
||
|
|
start = i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#undef COMMA
|
||
|
|
|
||
|
|
pr_debug2("cpumask list: %s\n", buf);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static char hex_char(unsigned char val)
|
||
|
|
{
|
||
|
|
if (val < 10)
|
||
|
|
return val + '0';
|
||
|
|
if (val < 16)
|
||
|
|
return val - 10 + 'a';
|
||
|
|
return '?';
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
|
||
|
|
{
|
||
|
|
int i, cpu;
|
||
|
|
char *ptr = buf;
|
||
|
|
unsigned char *bitmap;
|
||
|
|
int last_cpu = cpu_map__cpu(map, map->nr - 1);
|
||
|
|
|
||
|
|
if (buf == NULL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
bitmap = zalloc(last_cpu / 8 + 1);
|
||
|
|
if (bitmap == NULL) {
|
||
|
|
buf[0] = '\0';
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < map->nr; i++) {
|
||
|
|
cpu = cpu_map__cpu(map, i);
|
||
|
|
bitmap[cpu / 8] |= 1 << (cpu % 8);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
|
||
|
|
unsigned char bits = bitmap[cpu / 8];
|
||
|
|
|
||
|
|
if (cpu % 8)
|
||
|
|
bits >>= 4;
|
||
|
|
else
|
||
|
|
bits &= 0xf;
|
||
|
|
|
||
|
|
*ptr++ = hex_char(bits);
|
||
|
|
if ((cpu % 32) == 0 && cpu > 0)
|
||
|
|
*ptr++ = ',';
|
||
|
|
}
|
||
|
|
*ptr = '\0';
|
||
|
|
free(bitmap);
|
||
|
|
|
||
|
|
buf[size - 1] = '\0';
|
||
|
|
return ptr - buf;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
|
||
|
|
{
|
||
|
|
static const struct perf_cpu_map *online = NULL;
|
||
|
|
|
||
|
|
if (!online)
|
||
|
|
online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
|
||
|
|
|
||
|
|
return online;
|
||
|
|
}
|