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-rw-r--r--tools/testing/selftests/cgroup/.gitignore2
-rw-r--r--tools/testing/selftests/cgroup/Makefile12
-rw-r--r--tools/testing/selftests/cgroup/cgroup_util.c370
-rw-r--r--tools/testing/selftests/cgroup/cgroup_util.h43
-rw-r--r--tools/testing/selftests/cgroup/test_core.c567
-rw-r--r--tools/testing/selftests/cgroup/test_memcontrol.c1228
6 files changed, 2222 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/.gitignore b/tools/testing/selftests/cgroup/.gitignore
new file mode 100644
index 000000000..adacda50a
--- /dev/null
+++ b/tools/testing/selftests/cgroup/.gitignore
@@ -0,0 +1,2 @@
+test_memcontrol
+test_core
diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
new file mode 100644
index 000000000..23fbaa4a9
--- /dev/null
+++ b/tools/testing/selftests/cgroup/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -Wall
+
+all:
+
+TEST_GEN_PROGS = test_memcontrol
+TEST_GEN_PROGS += test_core
+
+include ../lib.mk
+
+$(OUTPUT)/test_memcontrol: cgroup_util.c
+$(OUTPUT)/test_core: cgroup_util.c
diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
new file mode 100644
index 000000000..a516d01f0
--- /dev/null
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -0,0 +1,370 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "cgroup_util.h"
+
+static ssize_t read_text(const char *path, char *buf, size_t max_len)
+{
+ ssize_t len;
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return fd;
+
+ len = read(fd, buf, max_len - 1);
+ if (len < 0)
+ goto out;
+
+ buf[len] = 0;
+out:
+ close(fd);
+ return len;
+}
+
+static ssize_t write_text(const char *path, char *buf, ssize_t len)
+{
+ int fd;
+
+ fd = open(path, O_WRONLY | O_APPEND);
+ if (fd < 0)
+ return fd;
+
+ len = write(fd, buf, len);
+ if (len < 0) {
+ close(fd);
+ return len;
+ }
+
+ close(fd);
+
+ return len;
+}
+
+char *cg_name(const char *root, const char *name)
+{
+ size_t len = strlen(root) + strlen(name) + 2;
+ char *ret = malloc(len);
+
+ snprintf(ret, len, "%s/%s", root, name);
+
+ return ret;
+}
+
+char *cg_name_indexed(const char *root, const char *name, int index)
+{
+ size_t len = strlen(root) + strlen(name) + 10;
+ char *ret = malloc(len);
+
+ snprintf(ret, len, "%s/%s_%d", root, name, index);
+
+ return ret;
+}
+
+int cg_read(const char *cgroup, const char *control, char *buf, size_t len)
+{
+ char path[PATH_MAX];
+
+ snprintf(path, sizeof(path), "%s/%s", cgroup, control);
+
+ if (read_text(path, buf, len) >= 0)
+ return 0;
+
+ return -1;
+}
+
+int cg_read_strcmp(const char *cgroup, const char *control,
+ const char *expected)
+{
+ size_t size;
+ char *buf;
+ int ret;
+
+ /* Handle the case of comparing against empty string */
+ if (!expected)
+ return -1;
+ else
+ size = strlen(expected) + 1;
+
+ buf = malloc(size);
+ if (!buf)
+ return -1;
+
+ if (cg_read(cgroup, control, buf, size)) {
+ free(buf);
+ return -1;
+ }
+
+ ret = strcmp(expected, buf);
+ free(buf);
+ return ret;
+}
+
+int cg_read_strstr(const char *cgroup, const char *control, const char *needle)
+{
+ char buf[PAGE_SIZE];
+
+ if (cg_read(cgroup, control, buf, sizeof(buf)))
+ return -1;
+
+ return strstr(buf, needle) ? 0 : -1;
+}
+
+long cg_read_long(const char *cgroup, const char *control)
+{
+ char buf[128];
+
+ if (cg_read(cgroup, control, buf, sizeof(buf)))
+ return -1;
+
+ return atol(buf);
+}
+
+long cg_read_key_long(const char *cgroup, const char *control, const char *key)
+{
+ char buf[PAGE_SIZE];
+ char *ptr;
+
+ if (cg_read(cgroup, control, buf, sizeof(buf)))
+ return -1;
+
+ ptr = strstr(buf, key);
+ if (!ptr)
+ return -1;
+
+ return atol(ptr + strlen(key));
+}
+
+int cg_write(const char *cgroup, const char *control, char *buf)
+{
+ char path[PATH_MAX];
+ ssize_t len = strlen(buf);
+
+ snprintf(path, sizeof(path), "%s/%s", cgroup, control);
+
+ if (write_text(path, buf, len) == len)
+ return 0;
+
+ return -1;
+}
+
+int cg_find_unified_root(char *root, size_t len)
+{
+ char buf[10 * PAGE_SIZE];
+ char *fs, *mount, *type;
+ const char delim[] = "\n\t ";
+
+ if (read_text("/proc/self/mounts", buf, sizeof(buf)) <= 0)
+ return -1;
+
+ /*
+ * Example:
+ * cgroup /sys/fs/cgroup cgroup2 rw,seclabel,noexec,relatime 0 0
+ */
+ for (fs = strtok(buf, delim); fs; fs = strtok(NULL, delim)) {
+ mount = strtok(NULL, delim);
+ type = strtok(NULL, delim);
+ strtok(NULL, delim);
+ strtok(NULL, delim);
+ strtok(NULL, delim);
+
+ if (strcmp(type, "cgroup2") == 0) {
+ strncpy(root, mount, len);
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+int cg_create(const char *cgroup)
+{
+ return mkdir(cgroup, 0755);
+}
+
+static int cg_killall(const char *cgroup)
+{
+ char buf[PAGE_SIZE];
+ char *ptr = buf;
+
+ if (cg_read(cgroup, "cgroup.procs", buf, sizeof(buf)))
+ return -1;
+
+ while (ptr < buf + sizeof(buf)) {
+ int pid = strtol(ptr, &ptr, 10);
+
+ if (pid == 0)
+ break;
+ if (*ptr)
+ ptr++;
+ else
+ break;
+ if (kill(pid, SIGKILL))
+ return -1;
+ }
+
+ return 0;
+}
+
+int cg_destroy(const char *cgroup)
+{
+ int ret;
+
+retry:
+ ret = rmdir(cgroup);
+ if (ret && errno == EBUSY) {
+ ret = cg_killall(cgroup);
+ if (ret)
+ return ret;
+ usleep(100);
+ goto retry;
+ }
+
+ if (ret && errno == ENOENT)
+ ret = 0;
+
+ return ret;
+}
+
+int cg_enter_current(const char *cgroup)
+{
+ char pidbuf[64];
+
+ snprintf(pidbuf, sizeof(pidbuf), "%d", getpid());
+ return cg_write(cgroup, "cgroup.procs", pidbuf);
+}
+
+int cg_run(const char *cgroup,
+ int (*fn)(const char *cgroup, void *arg),
+ void *arg)
+{
+ int pid, retcode;
+
+ pid = fork();
+ if (pid < 0) {
+ return pid;
+ } else if (pid == 0) {
+ char buf[64];
+
+ snprintf(buf, sizeof(buf), "%d", getpid());
+ if (cg_write(cgroup, "cgroup.procs", buf))
+ exit(EXIT_FAILURE);
+ exit(fn(cgroup, arg));
+ } else {
+ waitpid(pid, &retcode, 0);
+ if (WIFEXITED(retcode))
+ return WEXITSTATUS(retcode);
+ else
+ return -1;
+ }
+}
+
+int cg_run_nowait(const char *cgroup,
+ int (*fn)(const char *cgroup, void *arg),
+ void *arg)
+{
+ int pid;
+
+ pid = fork();
+ if (pid == 0) {
+ char buf[64];
+
+ snprintf(buf, sizeof(buf), "%d", getpid());
+ if (cg_write(cgroup, "cgroup.procs", buf))
+ exit(EXIT_FAILURE);
+ exit(fn(cgroup, arg));
+ }
+
+ return pid;
+}
+
+int get_temp_fd(void)
+{
+ return open(".", O_TMPFILE | O_RDWR | O_EXCL);
+}
+
+int alloc_pagecache(int fd, size_t size)
+{
+ char buf[PAGE_SIZE];
+ struct stat st;
+ int i;
+
+ if (fstat(fd, &st))
+ goto cleanup;
+
+ size += st.st_size;
+
+ if (ftruncate(fd, size))
+ goto cleanup;
+
+ for (i = 0; i < size; i += sizeof(buf))
+ read(fd, buf, sizeof(buf));
+
+ return 0;
+
+cleanup:
+ return -1;
+}
+
+int alloc_anon(const char *cgroup, void *arg)
+{
+ size_t size = (unsigned long)arg;
+ char *buf, *ptr;
+
+ buf = malloc(size);
+ for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
+ *ptr = 0;
+
+ free(buf);
+ return 0;
+}
+
+int is_swap_enabled(void)
+{
+ char buf[PAGE_SIZE];
+ const char delim[] = "\n";
+ int cnt = 0;
+ char *line;
+
+ if (read_text("/proc/swaps", buf, sizeof(buf)) <= 0)
+ return -1;
+
+ for (line = strtok(buf, delim); line; line = strtok(NULL, delim))
+ cnt++;
+
+ return cnt > 1;
+}
+
+int set_oom_adj_score(int pid, int score)
+{
+ char path[PATH_MAX];
+ int fd, len;
+
+ sprintf(path, "/proc/%d/oom_score_adj", pid);
+
+ fd = open(path, O_WRONLY | O_APPEND);
+ if (fd < 0)
+ return fd;
+
+ len = dprintf(fd, "%d", score);
+ if (len < 0) {
+ close(fd);
+ return len;
+ }
+
+ close(fd);
+ return 0;
+}
diff --git a/tools/testing/selftests/cgroup/cgroup_util.h b/tools/testing/selftests/cgroup/cgroup_util.h
new file mode 100644
index 000000000..9ac8b7958
--- /dev/null
+++ b/tools/testing/selftests/cgroup/cgroup_util.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <stdlib.h>
+
+#define PAGE_SIZE 4096
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define MB(x) (x << 20)
+
+/*
+ * Checks if two given values differ by less than err% of their sum.
+ */
+static inline int values_close(long a, long b, int err)
+{
+ return abs(a - b) <= (a + b) / 100 * err;
+}
+
+extern int cg_find_unified_root(char *root, size_t len);
+extern char *cg_name(const char *root, const char *name);
+extern char *cg_name_indexed(const char *root, const char *name, int index);
+extern int cg_create(const char *cgroup);
+extern int cg_destroy(const char *cgroup);
+extern int cg_read(const char *cgroup, const char *control,
+ char *buf, size_t len);
+extern int cg_read_strcmp(const char *cgroup, const char *control,
+ const char *expected);
+extern int cg_read_strstr(const char *cgroup, const char *control,
+ const char *needle);
+extern long cg_read_long(const char *cgroup, const char *control);
+long cg_read_key_long(const char *cgroup, const char *control, const char *key);
+extern int cg_write(const char *cgroup, const char *control, char *buf);
+extern int cg_run(const char *cgroup,
+ int (*fn)(const char *cgroup, void *arg),
+ void *arg);
+extern int cg_enter_current(const char *cgroup);
+extern int cg_run_nowait(const char *cgroup,
+ int (*fn)(const char *cgroup, void *arg),
+ void *arg);
+extern int get_temp_fd(void);
+extern int alloc_pagecache(int fd, size_t size);
+extern int alloc_anon(const char *cgroup, void *arg);
+extern int is_swap_enabled(void);
+extern int set_oom_adj_score(int pid, int score);
diff --git a/tools/testing/selftests/cgroup/test_core.c b/tools/testing/selftests/cgroup/test_core.c
new file mode 100644
index 000000000..599234c5e
--- /dev/null
+++ b/tools/testing/selftests/cgroup/test_core.c
@@ -0,0 +1,567 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#define _GNU_SOURCE
+#include <linux/limits.h>
+#include <linux/sched.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "../kselftest.h"
+#include "cgroup_util.h"
+
+/*
+ * A(0) - B(0) - C(1)
+ * \ D(0)
+ *
+ * A, B and C's "populated" fields would be 1 while D's 0.
+ * test that after the one process in C is moved to root,
+ * A,B and C's "populated" fields would flip to "0" and file
+ * modified events will be generated on the
+ * "cgroup.events" files of both cgroups.
+ */
+static int test_cgcore_populated(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *cg_test_a = NULL, *cg_test_b = NULL;
+ char *cg_test_c = NULL, *cg_test_d = NULL;
+
+ cg_test_a = cg_name(root, "cg_test_a");
+ cg_test_b = cg_name(root, "cg_test_a/cg_test_b");
+ cg_test_c = cg_name(root, "cg_test_a/cg_test_b/cg_test_c");
+ cg_test_d = cg_name(root, "cg_test_a/cg_test_b/cg_test_d");
+
+ if (!cg_test_a || !cg_test_b || !cg_test_c || !cg_test_d)
+ goto cleanup;
+
+ if (cg_create(cg_test_a))
+ goto cleanup;
+
+ if (cg_create(cg_test_b))
+ goto cleanup;
+
+ if (cg_create(cg_test_c))
+ goto cleanup;
+
+ if (cg_create(cg_test_d))
+ goto cleanup;
+
+ if (cg_enter_current(cg_test_c))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_a, "cgroup.events", "populated 1\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_b, "cgroup.events", "populated 1\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_c, "cgroup.events", "populated 1\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_d, "cgroup.events", "populated 0\n"))
+ goto cleanup;
+
+ if (cg_enter_current(root))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_a, "cgroup.events", "populated 0\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_b, "cgroup.events", "populated 0\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_c, "cgroup.events", "populated 0\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(cg_test_d, "cgroup.events", "populated 0\n"))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (cg_test_d)
+ cg_destroy(cg_test_d);
+ if (cg_test_c)
+ cg_destroy(cg_test_c);
+ if (cg_test_b)
+ cg_destroy(cg_test_b);
+ if (cg_test_a)
+ cg_destroy(cg_test_a);
+ free(cg_test_d);
+ free(cg_test_c);
+ free(cg_test_b);
+ free(cg_test_a);
+ return ret;
+}
+
+/*
+ * A (domain threaded) - B (threaded) - C (domain)
+ *
+ * test that C can't be used until it is turned into a
+ * threaded cgroup. "cgroup.type" file will report "domain (invalid)" in
+ * these cases. Operations which fail due to invalid topology use
+ * EOPNOTSUPP as the errno.
+ */
+static int test_cgcore_invalid_domain(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *grandparent = NULL, *parent = NULL, *child = NULL;
+
+ grandparent = cg_name(root, "cg_test_grandparent");
+ parent = cg_name(root, "cg_test_grandparent/cg_test_parent");
+ child = cg_name(root, "cg_test_grandparent/cg_test_parent/cg_test_child");
+ if (!parent || !child || !grandparent)
+ goto cleanup;
+
+ if (cg_create(grandparent))
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.type", "threaded"))
+ goto cleanup;
+
+ if (cg_read_strcmp(child, "cgroup.type", "domain invalid\n"))
+ goto cleanup;
+
+ if (!cg_enter_current(child))
+ goto cleanup;
+
+ if (errno != EOPNOTSUPP)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_enter_current(root);
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ if (grandparent)
+ cg_destroy(grandparent);
+ free(child);
+ free(parent);
+ free(grandparent);
+ return ret;
+}
+
+/*
+ * Test that when a child becomes threaded
+ * the parent type becomes domain threaded.
+ */
+static int test_cgcore_parent_becomes_threaded(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent = NULL, *child = NULL;
+
+ parent = cg_name(root, "cg_test_parent");
+ child = cg_name(root, "cg_test_parent/cg_test_child");
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(child, "cgroup.type", "threaded"))
+ goto cleanup;
+
+ if (cg_read_strcmp(parent, "cgroup.type", "domain threaded\n"))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+ return ret;
+
+}
+
+/*
+ * Test that there's no internal process constrain on threaded cgroups.
+ * You can add threads/processes on a parent with a controller enabled.
+ */
+static int test_cgcore_no_internal_process_constraint_on_threads(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent = NULL, *child = NULL;
+
+ if (cg_read_strstr(root, "cgroup.controllers", "cpu") ||
+ cg_write(root, "cgroup.subtree_control", "+cpu")) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ parent = cg_name(root, "cg_test_parent");
+ child = cg_name(root, "cg_test_parent/cg_test_child");
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.type", "threaded"))
+ goto cleanup;
+
+ if (cg_write(child, "cgroup.type", "threaded"))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.subtree_control", "+cpu"))
+ goto cleanup;
+
+ if (cg_enter_current(parent))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_enter_current(root);
+ cg_enter_current(root);
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+ return ret;
+}
+
+/*
+ * Test that you can't enable a controller on a child if it's not enabled
+ * on the parent.
+ */
+static int test_cgcore_top_down_constraint_enable(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent = NULL, *child = NULL;
+
+ parent = cg_name(root, "cg_test_parent");
+ child = cg_name(root, "cg_test_parent/cg_test_child");
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (!cg_write(child, "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+ return ret;
+}
+
+/*
+ * Test that you can't disable a controller on a parent
+ * if it's enabled in a child.
+ */
+static int test_cgcore_top_down_constraint_disable(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent = NULL, *child = NULL;
+
+ parent = cg_name(root, "cg_test_parent");
+ child = cg_name(root, "cg_test_parent/cg_test_child");
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_write(child, "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (!cg_write(parent, "cgroup.subtree_control", "-memory"))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+ return ret;
+}
+
+/*
+ * Test internal process constraint.
+ * You can't add a pid to a domain parent if a controller is enabled.
+ */
+static int test_cgcore_internal_process_constraint(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent = NULL, *child = NULL;
+
+ parent = cg_name(root, "cg_test_parent");
+ child = cg_name(root, "cg_test_parent/cg_test_child");
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (!cg_enter_current(parent))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+ return ret;
+}
+
+/*
+ * cgroup migration permission check should be performed based on the
+ * credentials at the time of open instead of write.
+ */
+static int test_cgcore_lesser_euid_open(const char *root)
+{
+ const uid_t test_euid = 65534; /* usually nobody, any !root is fine */
+ int ret = KSFT_FAIL;
+ char *cg_test_a = NULL, *cg_test_b = NULL;
+ char *cg_test_a_procs = NULL, *cg_test_b_procs = NULL;
+ int cg_test_b_procs_fd = -1;
+ uid_t saved_uid;
+
+ cg_test_a = cg_name(root, "cg_test_a");
+ cg_test_b = cg_name(root, "cg_test_b");
+
+ if (!cg_test_a || !cg_test_b)
+ goto cleanup;
+
+ cg_test_a_procs = cg_name(cg_test_a, "cgroup.procs");
+ cg_test_b_procs = cg_name(cg_test_b, "cgroup.procs");
+
+ if (!cg_test_a_procs || !cg_test_b_procs)
+ goto cleanup;
+
+ if (cg_create(cg_test_a) || cg_create(cg_test_b))
+ goto cleanup;
+
+ if (cg_enter_current(cg_test_a))
+ goto cleanup;
+
+ if (chown(cg_test_a_procs, test_euid, -1) ||
+ chown(cg_test_b_procs, test_euid, -1))
+ goto cleanup;
+
+ saved_uid = geteuid();
+ if (seteuid(test_euid))
+ goto cleanup;
+
+ cg_test_b_procs_fd = open(cg_test_b_procs, O_RDWR);
+
+ if (seteuid(saved_uid))
+ goto cleanup;
+
+ if (cg_test_b_procs_fd < 0)
+ goto cleanup;
+
+ if (write(cg_test_b_procs_fd, "0", 1) >= 0 || errno != EACCES)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_enter_current(root);
+ if (cg_test_b_procs_fd >= 0)
+ close(cg_test_b_procs_fd);
+ if (cg_test_b)
+ cg_destroy(cg_test_b);
+ if (cg_test_a)
+ cg_destroy(cg_test_a);
+ free(cg_test_b_procs);
+ free(cg_test_a_procs);
+ free(cg_test_b);
+ free(cg_test_a);
+ return ret;
+}
+
+struct lesser_ns_open_thread_arg {
+ const char *path;
+ int fd;
+ int err;
+};
+
+static int lesser_ns_open_thread_fn(void *arg)
+{
+ struct lesser_ns_open_thread_arg *targ = arg;
+
+ targ->fd = open(targ->path, O_RDWR);
+ targ->err = errno;
+ return 0;
+}
+
+/*
+ * cgroup migration permission check should be performed based on the cgroup
+ * namespace at the time of open instead of write.
+ */
+static int test_cgcore_lesser_ns_open(const char *root)
+{
+ static char stack[65536];
+ const uid_t test_euid = 65534; /* usually nobody, any !root is fine */
+ int ret = KSFT_FAIL;
+ char *cg_test_a = NULL, *cg_test_b = NULL;
+ char *cg_test_a_procs = NULL, *cg_test_b_procs = NULL;
+ int cg_test_b_procs_fd = -1;
+ struct lesser_ns_open_thread_arg targ = { .fd = -1 };
+ pid_t pid;
+ int status;
+
+ cg_test_a = cg_name(root, "cg_test_a");
+ cg_test_b = cg_name(root, "cg_test_b");
+
+ if (!cg_test_a || !cg_test_b)
+ goto cleanup;
+
+ cg_test_a_procs = cg_name(cg_test_a, "cgroup.procs");
+ cg_test_b_procs = cg_name(cg_test_b, "cgroup.procs");
+
+ if (!cg_test_a_procs || !cg_test_b_procs)
+ goto cleanup;
+
+ if (cg_create(cg_test_a) || cg_create(cg_test_b))
+ goto cleanup;
+
+ if (cg_enter_current(cg_test_b))
+ goto cleanup;
+
+ if (chown(cg_test_a_procs, test_euid, -1) ||
+ chown(cg_test_b_procs, test_euid, -1))
+ goto cleanup;
+
+ targ.path = cg_test_b_procs;
+ pid = clone(lesser_ns_open_thread_fn, stack + sizeof(stack),
+ CLONE_NEWCGROUP | CLONE_FILES | CLONE_VM | SIGCHLD,
+ &targ);
+ if (pid < 0)
+ goto cleanup;
+
+ if (waitpid(pid, &status, 0) < 0)
+ goto cleanup;
+
+ if (!WIFEXITED(status))
+ goto cleanup;
+
+ cg_test_b_procs_fd = targ.fd;
+ if (cg_test_b_procs_fd < 0)
+ goto cleanup;
+
+ if (cg_enter_current(cg_test_a))
+ goto cleanup;
+
+ if ((status = write(cg_test_b_procs_fd, "0", 1)) >= 0 || errno != ENOENT)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_enter_current(root);
+ if (cg_test_b_procs_fd >= 0)
+ close(cg_test_b_procs_fd);
+ if (cg_test_b)
+ cg_destroy(cg_test_b);
+ if (cg_test_a)
+ cg_destroy(cg_test_a);
+ free(cg_test_b_procs);
+ free(cg_test_a_procs);
+ free(cg_test_b);
+ free(cg_test_a);
+ return ret;
+}
+
+#define T(x) { x, #x }
+struct corecg_test {
+ int (*fn)(const char *root);
+ const char *name;
+} tests[] = {
+ T(test_cgcore_internal_process_constraint),
+ T(test_cgcore_top_down_constraint_enable),
+ T(test_cgcore_top_down_constraint_disable),
+ T(test_cgcore_no_internal_process_constraint_on_threads),
+ T(test_cgcore_parent_becomes_threaded),
+ T(test_cgcore_invalid_domain),
+ T(test_cgcore_populated),
+ T(test_cgcore_lesser_euid_open),
+ T(test_cgcore_lesser_ns_open),
+};
+#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", "memory"))
+ if (cg_write(root, "cgroup.subtree_control", "+memory"))
+ ksft_exit_skip("Failed to set memory 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;
+}
diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
new file mode 100644
index 000000000..c19a97dd0
--- /dev/null
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -0,0 +1,1228 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#define _GNU_SOURCE
+
+#include <linux/limits.h>
+#include <linux/oom.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "../kselftest.h"
+#include "cgroup_util.h"
+
+/*
+ * This test creates two nested cgroups with and without enabling
+ * the memory controller.
+ */
+static int test_memcg_subtree_control(const char *root)
+{
+ char *parent, *child, *parent2 = NULL, *child2 = NULL;
+ int ret = KSFT_FAIL;
+ char buf[PAGE_SIZE];
+
+ /* Create two nested cgroups with the memory controller enabled */
+ parent = cg_name(root, "memcg_test_0");
+ child = cg_name(root, "memcg_test_0/memcg_test_1");
+ if (!parent || !child)
+ goto cleanup_free;
+
+ if (cg_create(parent))
+ goto cleanup_free;
+
+ if (cg_write(parent, "cgroup.subtree_control", "+memory"))
+ goto cleanup_parent;
+
+ if (cg_create(child))
+ goto cleanup_parent;
+
+ if (cg_read_strstr(child, "cgroup.controllers", "memory"))
+ goto cleanup_child;
+
+ /* Create two nested cgroups without enabling memory controller */
+ parent2 = cg_name(root, "memcg_test_1");
+ child2 = cg_name(root, "memcg_test_1/memcg_test_1");
+ if (!parent2 || !child2)
+ goto cleanup_free2;
+
+ if (cg_create(parent2))
+ goto cleanup_free2;
+
+ if (cg_create(child2))
+ goto cleanup_parent2;
+
+ if (cg_read(child2, "cgroup.controllers", buf, sizeof(buf)))
+ goto cleanup_all;
+
+ if (!cg_read_strstr(child2, "cgroup.controllers", "memory"))
+ goto cleanup_all;
+
+ ret = KSFT_PASS;
+
+cleanup_all:
+ cg_destroy(child2);
+cleanup_parent2:
+ cg_destroy(parent2);
+cleanup_free2:
+ free(parent2);
+ free(child2);
+cleanup_child:
+ cg_destroy(child);
+cleanup_parent:
+ cg_destroy(parent);
+cleanup_free:
+ free(parent);
+ free(child);
+
+ return ret;
+}
+
+static int alloc_anon_50M_check(const char *cgroup, void *arg)
+{
+ size_t size = MB(50);
+ char *buf, *ptr;
+ long anon, current;
+ int ret = -1;
+
+ buf = malloc(size);
+ for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
+ *ptr = 0;
+
+ current = cg_read_long(cgroup, "memory.current");
+ if (current < size)
+ goto cleanup;
+
+ if (!values_close(size, current, 3))
+ goto cleanup;
+
+ anon = cg_read_key_long(cgroup, "memory.stat", "anon ");
+ if (anon < 0)
+ goto cleanup;
+
+ if (!values_close(anon, current, 3))
+ goto cleanup;
+
+ ret = 0;
+cleanup:
+ free(buf);
+ return ret;
+}
+
+static int alloc_pagecache_50M_check(const char *cgroup, void *arg)
+{
+ size_t size = MB(50);
+ int ret = -1;
+ long current, file;
+ int fd;
+
+ fd = get_temp_fd();
+ if (fd < 0)
+ return -1;
+
+ if (alloc_pagecache(fd, size))
+ goto cleanup;
+
+ current = cg_read_long(cgroup, "memory.current");
+ if (current < size)
+ goto cleanup;
+
+ file = cg_read_key_long(cgroup, "memory.stat", "file ");
+ if (file < 0)
+ goto cleanup;
+
+ if (!values_close(file, current, 10))
+ goto cleanup;
+
+ ret = 0;
+
+cleanup:
+ close(fd);
+ return ret;
+}
+
+/*
+ * This test create a memory cgroup, allocates
+ * some anonymous memory and some pagecache
+ * and check memory.current and some memory.stat values.
+ */
+static int test_memcg_current(const char *root)
+{
+ int ret = KSFT_FAIL;
+ long current;
+ char *memcg;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ current = cg_read_long(memcg, "memory.current");
+ if (current != 0)
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_anon_50M_check, NULL))
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_pagecache_50M_check, NULL))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+static int alloc_pagecache_50M(const char *cgroup, void *arg)
+{
+ int fd = (long)arg;
+
+ return alloc_pagecache(fd, MB(50));
+}
+
+static int alloc_pagecache_50M_noexit(const char *cgroup, void *arg)
+{
+ int fd = (long)arg;
+ int ppid = getppid();
+
+ if (alloc_pagecache(fd, MB(50)))
+ return -1;
+
+ while (getppid() == ppid)
+ sleep(1);
+
+ return 0;
+}
+
+static int alloc_anon_noexit(const char *cgroup, void *arg)
+{
+ int ppid = getppid();
+
+ if (alloc_anon(cgroup, arg))
+ return -1;
+
+ while (getppid() == ppid)
+ sleep(1);
+
+ return 0;
+}
+
+/*
+ * Wait until processes are killed asynchronously by the OOM killer
+ * If we exceed a timeout, fail.
+ */
+static int cg_test_proc_killed(const char *cgroup)
+{
+ int limit;
+
+ for (limit = 10; limit > 0; limit--) {
+ if (cg_read_strcmp(cgroup, "cgroup.procs", "") == 0)
+ return 0;
+
+ usleep(100000);
+ }
+ return -1;
+}
+
+/*
+ * First, this test creates the following hierarchy:
+ * A memory.min = 50M, memory.max = 200M
+ * A/B memory.min = 50M, memory.current = 50M
+ * A/B/C memory.min = 75M, memory.current = 50M
+ * A/B/D memory.min = 25M, memory.current = 50M
+ * A/B/E memory.min = 500M, memory.current = 0
+ * A/B/F memory.min = 0, memory.current = 50M
+ *
+ * Usages are pagecache, but the test keeps a running
+ * process in every leaf cgroup.
+ * Then it creates A/G and creates a significant
+ * memory pressure in it.
+ *
+ * A/B memory.current ~= 50M
+ * A/B/C memory.current ~= 33M
+ * A/B/D memory.current ~= 17M
+ * A/B/E memory.current ~= 0
+ *
+ * After that it tries to allocate more than there is
+ * unprotected memory in A available, and checks
+ * checks that memory.min protects pagecache even
+ * in this case.
+ */
+static int test_memcg_min(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent[3] = {NULL};
+ char *children[4] = {NULL};
+ long c[4];
+ int i, attempts;
+ int fd;
+
+ fd = get_temp_fd();
+ if (fd < 0)
+ goto cleanup;
+
+ parent[0] = cg_name(root, "memcg_test_0");
+ if (!parent[0])
+ goto cleanup;
+
+ parent[1] = cg_name(parent[0], "memcg_test_1");
+ if (!parent[1])
+ goto cleanup;
+
+ parent[2] = cg_name(parent[0], "memcg_test_2");
+ if (!parent[2])
+ goto cleanup;
+
+ if (cg_create(parent[0]))
+ goto cleanup;
+
+ if (cg_read_long(parent[0], "memory.min")) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_write(parent[0], "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_write(parent[0], "memory.max", "200M"))
+ goto cleanup;
+
+ if (cg_write(parent[0], "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_create(parent[1]))
+ goto cleanup;
+
+ if (cg_write(parent[1], "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_create(parent[2]))
+ goto cleanup;
+
+ for (i = 0; i < ARRAY_SIZE(children); i++) {
+ children[i] = cg_name_indexed(parent[1], "child_memcg", i);
+ if (!children[i])
+ goto cleanup;
+
+ if (cg_create(children[i]))
+ goto cleanup;
+
+ if (i == 2)
+ continue;
+
+ cg_run_nowait(children[i], alloc_pagecache_50M_noexit,
+ (void *)(long)fd);
+ }
+
+ if (cg_write(parent[0], "memory.min", "50M"))
+ goto cleanup;
+ if (cg_write(parent[1], "memory.min", "50M"))
+ goto cleanup;
+ if (cg_write(children[0], "memory.min", "75M"))
+ goto cleanup;
+ if (cg_write(children[1], "memory.min", "25M"))
+ goto cleanup;
+ if (cg_write(children[2], "memory.min", "500M"))
+ goto cleanup;
+ if (cg_write(children[3], "memory.min", "0"))
+ goto cleanup;
+
+ attempts = 0;
+ while (!values_close(cg_read_long(parent[1], "memory.current"),
+ MB(150), 3)) {
+ if (attempts++ > 5)
+ break;
+ sleep(1);
+ }
+
+ if (cg_run(parent[2], alloc_anon, (void *)MB(148)))
+ goto cleanup;
+
+ if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3))
+ goto cleanup;
+
+ for (i = 0; i < ARRAY_SIZE(children); i++)
+ c[i] = cg_read_long(children[i], "memory.current");
+
+ if (!values_close(c[0], MB(33), 10))
+ goto cleanup;
+
+ if (!values_close(c[1], MB(17), 10))
+ goto cleanup;
+
+ if (!values_close(c[2], 0, 1))
+ goto cleanup;
+
+ if (!cg_run(parent[2], alloc_anon, (void *)MB(170)))
+ goto cleanup;
+
+ if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ for (i = ARRAY_SIZE(children) - 1; i >= 0; i--) {
+ if (!children[i])
+ continue;
+
+ cg_destroy(children[i]);
+ free(children[i]);
+ }
+
+ for (i = ARRAY_SIZE(parent) - 1; i >= 0; i--) {
+ if (!parent[i])
+ continue;
+
+ cg_destroy(parent[i]);
+ free(parent[i]);
+ }
+ close(fd);
+ return ret;
+}
+
+/*
+ * First, this test creates the following hierarchy:
+ * A memory.low = 50M, memory.max = 200M
+ * A/B memory.low = 50M, memory.current = 50M
+ * A/B/C memory.low = 75M, memory.current = 50M
+ * A/B/D memory.low = 25M, memory.current = 50M
+ * A/B/E memory.low = 500M, memory.current = 0
+ * A/B/F memory.low = 0, memory.current = 50M
+ *
+ * Usages are pagecache.
+ * Then it creates A/G an creates a significant
+ * memory pressure in it.
+ *
+ * Then it checks actual memory usages and expects that:
+ * A/B memory.current ~= 50M
+ * A/B/ memory.current ~= 33M
+ * A/B/D memory.current ~= 17M
+ * A/B/E memory.current ~= 0
+ *
+ * After that it tries to allocate more than there is
+ * unprotected memory in A available,
+ * and checks low and oom events in memory.events.
+ */
+static int test_memcg_low(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent[3] = {NULL};
+ char *children[4] = {NULL};
+ long low, oom;
+ long c[4];
+ int i;
+ int fd;
+
+ fd = get_temp_fd();
+ if (fd < 0)
+ goto cleanup;
+
+ parent[0] = cg_name(root, "memcg_test_0");
+ if (!parent[0])
+ goto cleanup;
+
+ parent[1] = cg_name(parent[0], "memcg_test_1");
+ if (!parent[1])
+ goto cleanup;
+
+ parent[2] = cg_name(parent[0], "memcg_test_2");
+ if (!parent[2])
+ goto cleanup;
+
+ if (cg_create(parent[0]))
+ goto cleanup;
+
+ if (cg_read_long(parent[0], "memory.low"))
+ goto cleanup;
+
+ if (cg_write(parent[0], "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_write(parent[0], "memory.max", "200M"))
+ goto cleanup;
+
+ if (cg_write(parent[0], "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_create(parent[1]))
+ goto cleanup;
+
+ if (cg_write(parent[1], "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_create(parent[2]))
+ goto cleanup;
+
+ for (i = 0; i < ARRAY_SIZE(children); i++) {
+ children[i] = cg_name_indexed(parent[1], "child_memcg", i);
+ if (!children[i])
+ goto cleanup;
+
+ if (cg_create(children[i]))
+ goto cleanup;
+
+ if (i == 2)
+ continue;
+
+ if (cg_run(children[i], alloc_pagecache_50M, (void *)(long)fd))
+ goto cleanup;
+ }
+
+ if (cg_write(parent[0], "memory.low", "50M"))
+ goto cleanup;
+ if (cg_write(parent[1], "memory.low", "50M"))
+ goto cleanup;
+ if (cg_write(children[0], "memory.low", "75M"))
+ goto cleanup;
+ if (cg_write(children[1], "memory.low", "25M"))
+ goto cleanup;
+ if (cg_write(children[2], "memory.low", "500M"))
+ goto cleanup;
+ if (cg_write(children[3], "memory.low", "0"))
+ goto cleanup;
+
+ if (cg_run(parent[2], alloc_anon, (void *)MB(148)))
+ goto cleanup;
+
+ if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3))
+ goto cleanup;
+
+ for (i = 0; i < ARRAY_SIZE(children); i++)
+ c[i] = cg_read_long(children[i], "memory.current");
+
+ if (!values_close(c[0], MB(33), 10))
+ goto cleanup;
+
+ if (!values_close(c[1], MB(17), 10))
+ goto cleanup;
+
+ if (!values_close(c[2], 0, 1))
+ goto cleanup;
+
+ if (cg_run(parent[2], alloc_anon, (void *)MB(166))) {
+ fprintf(stderr,
+ "memory.low prevents from allocating anon memory\n");
+ goto cleanup;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(children); i++) {
+ oom = cg_read_key_long(children[i], "memory.events", "oom ");
+ low = cg_read_key_long(children[i], "memory.events", "low ");
+
+ if (oom)
+ goto cleanup;
+ if (i < 2 && low <= 0)
+ goto cleanup;
+ if (i >= 2 && low)
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ for (i = ARRAY_SIZE(children) - 1; i >= 0; i--) {
+ if (!children[i])
+ continue;
+
+ cg_destroy(children[i]);
+ free(children[i]);
+ }
+
+ for (i = ARRAY_SIZE(parent) - 1; i >= 0; i--) {
+ if (!parent[i])
+ continue;
+
+ cg_destroy(parent[i]);
+ free(parent[i]);
+ }
+ close(fd);
+ return ret;
+}
+
+static int alloc_pagecache_max_30M(const char *cgroup, void *arg)
+{
+ size_t size = MB(50);
+ int ret = -1;
+ long current;
+ int fd;
+
+ fd = get_temp_fd();
+ if (fd < 0)
+ return -1;
+
+ if (alloc_pagecache(fd, size))
+ goto cleanup;
+
+ current = cg_read_long(cgroup, "memory.current");
+ if (current <= MB(29) || current > MB(30))
+ goto cleanup;
+
+ ret = 0;
+
+cleanup:
+ close(fd);
+ return ret;
+
+}
+
+/*
+ * This test checks that memory.high limits the amount of
+ * memory which can be consumed by either anonymous memory
+ * or pagecache.
+ */
+static int test_memcg_high(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *memcg;
+ long high;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ if (cg_read_strcmp(memcg, "memory.high", "max\n"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.high", "30M"))
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (!cg_run(memcg, alloc_pagecache_50M_check, NULL))
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_pagecache_max_30M, NULL))
+ goto cleanup;
+
+ high = cg_read_key_long(memcg, "memory.events", "high ");
+ if (high <= 0)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+/*
+ * This test checks that memory.max limits the amount of
+ * memory which can be consumed by either anonymous memory
+ * or pagecache.
+ */
+static int test_memcg_max(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *memcg;
+ long current, max;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ if (cg_read_strcmp(memcg, "memory.max", "max\n"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.max", "30M"))
+ goto cleanup;
+
+ /* Should be killed by OOM killer */
+ if (!cg_run(memcg, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_pagecache_max_30M, NULL))
+ goto cleanup;
+
+ current = cg_read_long(memcg, "memory.current");
+ if (current > MB(30) || !current)
+ goto cleanup;
+
+ max = cg_read_key_long(memcg, "memory.events", "max ");
+ if (max <= 0)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+static int alloc_anon_50M_check_swap(const char *cgroup, void *arg)
+{
+ long mem_max = (long)arg;
+ size_t size = MB(50);
+ char *buf, *ptr;
+ long mem_current, swap_current;
+ int ret = -1;
+
+ buf = malloc(size);
+ for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
+ *ptr = 0;
+
+ mem_current = cg_read_long(cgroup, "memory.current");
+ if (!mem_current || !values_close(mem_current, mem_max, 3))
+ goto cleanup;
+
+ swap_current = cg_read_long(cgroup, "memory.swap.current");
+ if (!swap_current ||
+ !values_close(mem_current + swap_current, size, 3))
+ goto cleanup;
+
+ ret = 0;
+cleanup:
+ free(buf);
+ return ret;
+}
+
+/*
+ * This test checks that memory.swap.max limits the amount of
+ * anonymous memory which can be swapped out.
+ */
+static int test_memcg_swap_max(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *memcg;
+ long max;
+
+ if (!is_swap_enabled())
+ return KSFT_SKIP;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ if (cg_read_long(memcg, "memory.swap.current")) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_read_strcmp(memcg, "memory.max", "max\n"))
+ goto cleanup;
+
+ if (cg_read_strcmp(memcg, "memory.swap.max", "max\n"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "30M"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.max", "30M"))
+ goto cleanup;
+
+ /* Should be killed by OOM killer */
+ if (!cg_run(memcg, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.events", "oom ") != 1)
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 1)
+ goto cleanup;
+
+ if (cg_run(memcg, alloc_anon_50M_check_swap, (void *)MB(30)))
+ goto cleanup;
+
+ max = cg_read_key_long(memcg, "memory.events", "max ");
+ if (max <= 0)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+/*
+ * This test disables swapping and tries to allocate anonymous memory
+ * up to OOM. Then it checks for oom and oom_kill events in
+ * memory.events.
+ */
+static int test_memcg_oom_events(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *memcg;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.max", "30M"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (!cg_run(memcg, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_read_strcmp(memcg, "cgroup.procs", ""))
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.events", "oom ") != 1)
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 1)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+struct tcp_server_args {
+ unsigned short port;
+ int ctl[2];
+};
+
+static int tcp_server(const char *cgroup, void *arg)
+{
+ struct tcp_server_args *srv_args = arg;
+ struct sockaddr_in6 saddr = { 0 };
+ socklen_t slen = sizeof(saddr);
+ int sk, client_sk, ctl_fd, yes = 1, ret = -1;
+
+ close(srv_args->ctl[0]);
+ ctl_fd = srv_args->ctl[1];
+
+ saddr.sin6_family = AF_INET6;
+ saddr.sin6_addr = in6addr_any;
+ saddr.sin6_port = htons(srv_args->port);
+
+ sk = socket(AF_INET6, SOCK_STREAM, 0);
+ if (sk < 0)
+ return ret;
+
+ if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
+ goto cleanup;
+
+ if (bind(sk, (struct sockaddr *)&saddr, slen)) {
+ write(ctl_fd, &errno, sizeof(errno));
+ goto cleanup;
+ }
+
+ if (listen(sk, 1))
+ goto cleanup;
+
+ ret = 0;
+ if (write(ctl_fd, &ret, sizeof(ret)) != sizeof(ret)) {
+ ret = -1;
+ goto cleanup;
+ }
+
+ client_sk = accept(sk, NULL, NULL);
+ if (client_sk < 0)
+ goto cleanup;
+
+ ret = -1;
+ for (;;) {
+ uint8_t buf[0x100000];
+
+ if (write(client_sk, buf, sizeof(buf)) <= 0) {
+ if (errno == ECONNRESET)
+ ret = 0;
+ break;
+ }
+ }
+
+ close(client_sk);
+
+cleanup:
+ close(sk);
+ return ret;
+}
+
+static int tcp_client(const char *cgroup, unsigned short port)
+{
+ const char server[] = "localhost";
+ struct addrinfo *ai;
+ char servport[6];
+ int retries = 0x10; /* nice round number */
+ int sk, ret;
+
+ snprintf(servport, sizeof(servport), "%hd", port);
+ ret = getaddrinfo(server, servport, NULL, &ai);
+ if (ret)
+ return ret;
+
+ sk = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if (sk < 0)
+ goto free_ainfo;
+
+ ret = connect(sk, ai->ai_addr, ai->ai_addrlen);
+ if (ret < 0)
+ goto close_sk;
+
+ ret = KSFT_FAIL;
+ while (retries--) {
+ uint8_t buf[0x100000];
+ long current, sock;
+
+ if (read(sk, buf, sizeof(buf)) <= 0)
+ goto close_sk;
+
+ current = cg_read_long(cgroup, "memory.current");
+ sock = cg_read_key_long(cgroup, "memory.stat", "sock ");
+
+ if (current < 0 || sock < 0)
+ goto close_sk;
+
+ if (current < sock)
+ goto close_sk;
+
+ if (values_close(current, sock, 10)) {
+ ret = KSFT_PASS;
+ break;
+ }
+ }
+
+close_sk:
+ close(sk);
+free_ainfo:
+ freeaddrinfo(ai);
+ return ret;
+}
+
+/*
+ * This test checks socket memory accounting.
+ * The test forks a TCP server listens on a random port between 1000
+ * and 61000. Once it gets a client connection, it starts writing to
+ * its socket.
+ * The TCP client interleaves reads from the socket with check whether
+ * memory.current and memory.stat.sock are similar.
+ */
+static int test_memcg_sock(const char *root)
+{
+ int bind_retries = 5, ret = KSFT_FAIL, pid, err;
+ unsigned short port;
+ char *memcg;
+
+ memcg = cg_name(root, "memcg_test");
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ while (bind_retries--) {
+ struct tcp_server_args args;
+
+ if (pipe(args.ctl))
+ goto cleanup;
+
+ port = args.port = 1000 + rand() % 60000;
+
+ pid = cg_run_nowait(memcg, tcp_server, &args);
+ if (pid < 0)
+ goto cleanup;
+
+ close(args.ctl[1]);
+ if (read(args.ctl[0], &err, sizeof(err)) != sizeof(err))
+ goto cleanup;
+ close(args.ctl[0]);
+
+ if (!err)
+ break;
+ if (err != EADDRINUSE)
+ goto cleanup;
+
+ waitpid(pid, NULL, 0);
+ }
+
+ if (err == EADDRINUSE) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (tcp_client(memcg, port) != KSFT_PASS)
+ goto cleanup;
+
+ waitpid(pid, &err, 0);
+ if (WEXITSTATUS(err))
+ goto cleanup;
+
+ if (cg_read_long(memcg, "memory.current") < 0)
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.stat", "sock "))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+/*
+ * This test disables swapping and tries to allocate anonymous memory
+ * up to OOM with memory.group.oom set. Then it checks that all
+ * processes in the leaf (but not the parent) were killed.
+ */
+static int test_memcg_oom_group_leaf_events(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent, *child;
+
+ parent = cg_name(root, "memcg_test_0");
+ child = cg_name(root, "memcg_test_0/memcg_test_1");
+
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "cgroup.subtree_control", "+memory"))
+ goto cleanup;
+
+ if (cg_write(child, "memory.max", "50M"))
+ goto cleanup;
+
+ if (cg_write(child, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(child, "memory.oom.group", "1"))
+ goto cleanup;
+
+ cg_run_nowait(parent, alloc_anon_noexit, (void *) MB(60));
+ cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1));
+ cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1));
+ if (!cg_run(child, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_test_proc_killed(child))
+ goto cleanup;
+
+ if (cg_read_key_long(child, "memory.events", "oom_kill ") <= 0)
+ goto cleanup;
+
+ if (cg_read_key_long(parent, "memory.events", "oom_kill ") != 0)
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+
+ return ret;
+}
+
+/*
+ * This test disables swapping and tries to allocate anonymous memory
+ * up to OOM with memory.group.oom set. Then it checks that all
+ * processes in the parent and leaf were killed.
+ */
+static int test_memcg_oom_group_parent_events(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *parent, *child;
+
+ parent = cg_name(root, "memcg_test_0");
+ child = cg_name(root, "memcg_test_0/memcg_test_1");
+
+ if (!parent || !child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_write(parent, "memory.max", "80M"))
+ goto cleanup;
+
+ if (cg_write(parent, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(parent, "memory.oom.group", "1"))
+ goto cleanup;
+
+ cg_run_nowait(parent, alloc_anon_noexit, (void *) MB(60));
+ cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1));
+ cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1));
+
+ if (!cg_run(child, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_test_proc_killed(child))
+ goto cleanup;
+ if (cg_test_proc_killed(parent))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ if (parent)
+ cg_destroy(parent);
+ free(child);
+ free(parent);
+
+ return ret;
+}
+
+/*
+ * This test disables swapping and tries to allocate anonymous memory
+ * up to OOM with memory.group.oom set. Then it checks that all
+ * processes were killed except those set with OOM_SCORE_ADJ_MIN
+ */
+static int test_memcg_oom_group_score_events(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *memcg;
+ int safe_pid;
+
+ memcg = cg_name(root, "memcg_test_0");
+
+ if (!memcg)
+ goto cleanup;
+
+ if (cg_create(memcg))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.max", "50M"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.swap.max", "0"))
+ goto cleanup;
+
+ if (cg_write(memcg, "memory.oom.group", "1"))
+ goto cleanup;
+
+ safe_pid = cg_run_nowait(memcg, alloc_anon_noexit, (void *) MB(1));
+ if (set_oom_adj_score(safe_pid, OOM_SCORE_ADJ_MIN))
+ goto cleanup;
+
+ cg_run_nowait(memcg, alloc_anon_noexit, (void *) MB(1));
+ if (!cg_run(memcg, alloc_anon, (void *)MB(100)))
+ goto cleanup;
+
+ if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 3)
+ goto cleanup;
+
+ if (kill(safe_pid, SIGKILL))
+ goto cleanup;
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (memcg)
+ cg_destroy(memcg);
+ free(memcg);
+
+ return ret;
+}
+
+
+#define T(x) { x, #x }
+struct memcg_test {
+ int (*fn)(const char *root);
+ const char *name;
+} tests[] = {
+ T(test_memcg_subtree_control),
+ T(test_memcg_current),
+ T(test_memcg_min),
+ T(test_memcg_low),
+ T(test_memcg_high),
+ T(test_memcg_max),
+ T(test_memcg_oom_events),
+ T(test_memcg_swap_max),
+ T(test_memcg_sock),
+ T(test_memcg_oom_group_leaf_events),
+ T(test_memcg_oom_group_parent_events),
+ T(test_memcg_oom_group_score_events),
+};
+#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");
+
+ /*
+ * Check that memory controller is available:
+ * memory is listed in cgroup.controllers
+ */
+ if (cg_read_strstr(root, "cgroup.controllers", "memory"))
+ ksft_exit_skip("memory controller isn't available\n");
+
+ if (cg_read_strstr(root, "cgroup.subtree_control", "memory"))
+ if (cg_write(root, "cgroup.subtree_control", "+memory"))
+ ksft_exit_skip("Failed to set memory 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 07:28:06 +0000