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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <linux/limits.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <time.h>
#include "../kselftest.h"
#include "cgroup_util.h"
struct cpu_hog_func_param {
int nprocs;
struct timespec ts;
};
/*
* This test creates two nested cgroups with and without enabling
* the cpu controller.
*/
static int test_cpucg_subtree_control(const char *root)
{
char *parent = NULL, *child = NULL, *parent2 = NULL, *child2 = NULL;
int ret = KSFT_FAIL;
// Create two nested cgroups with the cpu controller enabled.
parent = cg_name(root, "cpucg_test_0");
if (!parent)
goto cleanup;
if (cg_create(parent))
goto cleanup;
if (cg_write(parent, "cgroup.subtree_control", "+cpu"))
goto cleanup;
child = cg_name(parent, "cpucg_test_child");
if (!child)
goto cleanup;
if (cg_create(child))
goto cleanup;
if (cg_read_strstr(child, "cgroup.controllers", "cpu"))
goto cleanup;
// Create two nested cgroups without enabling the cpu controller.
parent2 = cg_name(root, "cpucg_test_1");
if (!parent2)
goto cleanup;
if (cg_create(parent2))
goto cleanup;
child2 = cg_name(parent2, "cpucg_test_child");
if (!child2)
goto cleanup;
if (cg_create(child2))
goto cleanup;
if (!cg_read_strstr(child2, "cgroup.controllers", "cpu"))
goto cleanup;
ret = KSFT_PASS;
cleanup:
cg_destroy(child);
free(child);
cg_destroy(child2);
free(child2);
cg_destroy(parent);
free(parent);
cg_destroy(parent2);
free(parent2);
return ret;
}
static void *hog_cpu_thread_func(void *arg)
{
while (1)
;
return NULL;
}
static struct timespec
timespec_sub(const struct timespec *lhs, const struct timespec *rhs)
{
struct timespec zero = {
.tv_sec = 0,
.tv_nsec = 0,
};
struct timespec ret;
if (lhs->tv_sec < rhs->tv_sec)
return zero;
ret.tv_sec = lhs->tv_sec - rhs->tv_sec;
if (lhs->tv_nsec < rhs->tv_nsec) {
if (ret.tv_sec == 0)
return zero;
ret.tv_sec--;
ret.tv_nsec = NSEC_PER_SEC - rhs->tv_nsec + lhs->tv_nsec;
} else
ret.tv_nsec = lhs->tv_nsec - rhs->tv_nsec;
return ret;
}
static int hog_cpus_timed(const char *cgroup, void *arg)
{
const struct cpu_hog_func_param *param =
(struct cpu_hog_func_param *)arg;
struct timespec ts_run = param->ts;
struct timespec ts_remaining = ts_run;
int i, ret;
for (i = 0; i < param->nprocs; i++) {
pthread_t tid;
ret = pthread_create(&tid, NULL, &hog_cpu_thread_func, NULL);
if (ret != 0)
return ret;
}
while (ts_remaining.tv_sec > 0 || ts_remaining.tv_nsec > 0) {
struct timespec ts_total;
ret = nanosleep(&ts_remaining, NULL);
if (ret && errno != EINTR)
return ret;
ret = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts_total);
if (ret != 0)
return ret;
ts_remaining = timespec_sub(&ts_run, &ts_total);
}
return 0;
}
/*
* Creates a cpu cgroup, burns a CPU for a few quanta, and verifies that
* cpu.stat shows the expected output.
*/
static int test_cpucg_stats(const char *root)
{
int ret = KSFT_FAIL;
long usage_usec, user_usec, system_usec;
long usage_seconds = 2;
long expected_usage_usec = usage_seconds * USEC_PER_SEC;
char *cpucg;
cpucg = cg_name(root, "cpucg_test");
if (!cpucg)
goto cleanup;
if (cg_create(cpucg))
goto cleanup;
usage_usec = cg_read_key_long(cpucg, "cpu.stat", "usage_usec");
user_usec = cg_read_key_long(cpucg, "cpu.stat", "user_usec");
system_usec = cg_read_key_long(cpucg, "cpu.stat", "system_usec");
if (usage_usec != 0 || user_usec != 0 || system_usec != 0)
goto cleanup;
struct cpu_hog_func_param param = {
.nprocs = 1,
.ts = {
.tv_sec = usage_seconds,
.tv_nsec = 0,
},
};
if (cg_run(cpucg, hog_cpus_timed, (void *)¶m))
goto cleanup;
usage_usec = cg_read_key_long(cpucg, "cpu.stat", "usage_usec");
user_usec = cg_read_key_long(cpucg, "cpu.stat", "user_usec");
if (user_usec <= 0)
goto cleanup;
if (!values_close(usage_usec, expected_usage_usec, 1))
goto cleanup;
ret = KSFT_PASS;
cleanup:
cg_destroy(cpucg);
free(cpucg);
return ret;
}
#define T(x) { x, #x }
struct cpucg_test {
int (*fn)(const char *root);
const char *name;
} tests[] = {
T(test_cpucg_subtree_control),
T(test_cpucg_stats),
};
#undef T
int main(int argc, char *argv[])
{
char root[PATH_MAX];
int i, ret = EXIT_SUCCESS;
if (cg_find_unified_root(root, sizeof(root)))
ksft_exit_skip("cgroup v2 isn't mounted\n");
if (cg_read_strstr(root, "cgroup.subtree_control", "cpu"))
if (cg_write(root, "cgroup.subtree_control", "+cpu"))
ksft_exit_skip("Failed to set cpu controller\n");
for (i = 0; i < ARRAY_SIZE(tests); i++) {
switch (tests[i].fn(root)) {
case KSFT_PASS:
ksft_test_result_pass("%s\n", tests[i].name);
break;
case KSFT_SKIP:
ksft_test_result_skip("%s\n", tests[i].name);
break;
default:
ret = EXIT_FAILURE;
ksft_test_result_fail("%s\n", tests[i].name);
break;
}
}
return ret;
}
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