mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-05 03:35:52 -04:00
Code Issues Packages Projects Releases Wiki Activity

selftests: cgroup: Optionally set up v1 environment

Browse Source 
Use the missing mount of the unifier hierarchy as a hint of legacy
system and prepare our own named v1 hierarchy for tests.

The code is only in test_core.c and not cgroup_util.c because other
selftests are related to controllers which will be exposed on v2
hierarchy but named hierarchies are only v1 thing.

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Michal Koutný
2025-06-17 15:36:55 +02:00
committed by Tejun Heo
parent dd7588e455
commit d74cd7864f
1 changed files with 42 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
tools/testing/selftests/cgroup/test_core.c
View File

@@ -5,6 +5,8 @@
#include <linux/sched.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
@@ -863,6 +865,38 @@ static int test_cgcore_lesser_ns_open(const char *root)
return ret;
}
static int setup_named_v1_root(char *root, size_t len, const char *name)
{
char options[PATH_MAX];
int r;
r = snprintf(root, len, "/mnt/cg_selftest");
if (r < 0)
return r;
r = snprintf(options, sizeof(options), "none,name=%s", name);
if (r < 0)
return r;
r = mkdir(root, 0755);
if (r < 0 && errno != EEXIST)
return r;
r = mount("none", root, "cgroup", 0, options);
if (r < 0)
return r;
return 0;
}
static void cleanup_named_v1_root(char *root)
{
if (!cg_test_v1_named)
return;
umount(root);
rmdir(root);
}
#define T(x) { x, #x }
struct corecg_test {
int (*fn)(const char *root);
@@ -888,13 +922,18 @@ int main(int argc, char *argv[])
char root[PATH_MAX];
int i, ret = EXIT_SUCCESS;
if (cg_find_unified_root(root, sizeof(root), &nsdelegate))
ksft_exit_skip("cgroup v2 isn't mounted\n");
if (cg_find_unified_root(root, sizeof(root), &nsdelegate)) {
if (setup_named_v1_root(root, sizeof(root), CG_NAMED_NAME))
ksft_exit_skip("cgroup v2 isn't mounted and could not setup named v1 hierarchy\n");
cg_test_v1_named = true;
goto post_v2_setup;
}
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");
post_v2_setup:
for (i = 0; i < ARRAY_SIZE(tests); i++) {
switch (tests[i].fn(root)) {
case KSFT_PASS:
@@ -910,5 +949,6 @@ int main(int argc, char *argv[])
}
}
cleanup_named_v1_root(root);
return ret;
}