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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sched.h>
#include "alloc-util.h"
#include "cpu-set-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "missing_syscall.h"
#include "numa-util.h"
#include "stdio-util.h"
#include "string-table.h"
bool numa_policy_is_valid(const NUMAPolicy *policy) {
assert(policy);
if (!mpol_is_valid(numa_policy_get_type(policy)))
return false;
if (!policy->nodes.set &&
!IN_SET(numa_policy_get_type(policy), MPOL_DEFAULT, MPOL_LOCAL, MPOL_PREFERRED))
return false;
if (policy->nodes.set &&
numa_policy_get_type(policy) == MPOL_PREFERRED &&
CPU_COUNT_S(policy->nodes.allocated, policy->nodes.set) != 1)
return false;
return true;
}
static int numa_policy_to_mempolicy(const NUMAPolicy *policy, unsigned long *ret_maxnode, unsigned long **ret_nodes) {
unsigned node, bits = 0, ulong_bits;
_cleanup_free_ unsigned long *out = NULL;
assert(policy);
assert(ret_maxnode);
assert(ret_nodes);
if (IN_SET(numa_policy_get_type(policy), MPOL_DEFAULT, MPOL_LOCAL) ||
(numa_policy_get_type(policy) == MPOL_PREFERRED && !policy->nodes.set)) {
*ret_nodes = NULL;
*ret_maxnode = 0;
return 0;
}
bits = policy->nodes.allocated * 8;
ulong_bits = sizeof(unsigned long) * 8;
out = new0(unsigned long, DIV_ROUND_UP(policy->nodes.allocated, sizeof(unsigned long)));
if (!out)
return -ENOMEM;
/* We don't make any assumptions about internal type libc is using to store NUMA node mask.
Hence we need to convert the node mask to the representation expected by set_mempolicy() */
for (node = 0; node < bits; node++)
if (CPU_ISSET_S(node, policy->nodes.allocated, policy->nodes.set))
out[node / ulong_bits] |= 1ul << (node % ulong_bits);
*ret_nodes = TAKE_PTR(out);
*ret_maxnode = bits + 1;
return 0;
}
int apply_numa_policy(const NUMAPolicy *policy) {
int r;
_cleanup_free_ unsigned long *nodes = NULL;
unsigned long maxnode;
assert(policy);
if (get_mempolicy(NULL, NULL, 0, 0, 0) < 0 && errno == ENOSYS)
return -EOPNOTSUPP;
if (!numa_policy_is_valid(policy))
return -EINVAL;
r = numa_policy_to_mempolicy(policy, &maxnode, &nodes);
if (r < 0)
return r;
r = set_mempolicy(numa_policy_get_type(policy), nodes, maxnode);
if (r < 0)
return -errno;
return 0;
}
int numa_to_cpu_set(const NUMAPolicy *policy, CPUSet *ret) {
int r;
size_t i;
_cleanup_(cpu_set_reset) CPUSet s = {};
assert(policy);
assert(ret);
for (i = 0; i < policy->nodes.allocated * 8; i++) {
_cleanup_free_ char *l = NULL;
char p[STRLEN("/sys/devices/system/node/node//cpulist") + DECIMAL_STR_MAX(size_t) + 1];
_cleanup_(cpu_set_reset) CPUSet part = {};
if (!CPU_ISSET_S(i, policy->nodes.allocated, policy->nodes.set))
continue;
xsprintf(p, "/sys/devices/system/node/node%zu/cpulist", i);
r = read_one_line_file(p, &l);
if (r < 0)
return r;
r = parse_cpu_set(l, &part);
if (r < 0)
return r;
r = cpu_set_add_all(&s, &part);
if (r < 0)
return r;
}
*ret = s;
s = (CPUSet) {};
return 0;
}
static int numa_max_node(void) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r, max_node = 0;
d = opendir("/sys/devices/system/node");
if (!d)
return -errno;
FOREACH_DIRENT(de, d, break) {
int node;
const char *n;
(void) dirent_ensure_type(d, de);
if (de->d_type != DT_DIR)
continue;
n = startswith(de->d_name, "node");
if (!n)
continue;
r = safe_atoi(n, &node);
if (r < 0)
continue;
if (node > max_node)
max_node = node;
}
return max_node;
}
int numa_mask_add_all(CPUSet *mask) {
int m;
assert(mask);
m = numa_max_node();
if (m < 0) {
log_debug_errno(m, "Failed to determine maximum NUMA node index, assuming 1023: %m");
m = 1023; /* CONFIG_NODES_SHIFT is set to 10 on x86_64, i.e. 1024 NUMA nodes in total */
}
for (int i = 0; i <= m; i++) {
int r;
r = cpu_set_add(mask, i);
if (r < 0)
return r;
}
return 0;
}
static const char* const mpol_table[] = {
[MPOL_DEFAULT] = "default",
[MPOL_PREFERRED] = "preferred",
[MPOL_BIND] = "bind",
[MPOL_INTERLEAVE] = "interleave",
[MPOL_LOCAL] = "local",
};
DEFINE_STRING_TABLE_LOOKUP(mpol, int);
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