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Merge pull request #2903 from keszybz/cgroup2-v3

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core: cgroup2 support
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2016-03-29 20:25:00 -04:00
parent a9447e0e48 e57051f542
commit 1b81db7a66
8 changed files with 53 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/basic/cgroup-util.c
+37 -10
View File
@@ -101,6 +101,39 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
return 1;
}
int cg_read_event(const char *controller, const char *path, const char *event,
char **val)
{
_cleanup_free_ char *events = NULL, *content = NULL;
char *p, *line;
int r;
r = cg_get_path(controller, path, "cgroup.events", &events);
if (r < 0)
return r;
r = read_full_file(events, &content, NULL);
if (r < 0)
return r;
p = content;
while ((line = strsep(&p, "\n"))) {
char *key;
key = strsep(&line, " ");
if (!key || !line)
return -EINVAL;
if (strcmp(key, event))
continue;
*val = strdup(line);
return 0;
}
return -ENOENT;
}
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
_cleanup_free_ char *fs = NULL;
int r;
@@ -1007,18 +1040,12 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
return unified;
if (unified > 0) {
_cleanup_free_ char *populated = NULL, *t = NULL;
_cleanup_free_ char *t = NULL;
/* On the unified hierarchy we can check empty state
* via the "cgroup.populated" attribute. */
* via the "populated" attribute of "cgroup.events". */
r = cg_get_path(controller, path, "cgroup.populated", &populated);
if (r < 0)
return r;
r = read_one_line_file(populated, &t);
if (r == -ENOENT)
return 1;
r = cg_read_event(controller, path, "populated", &t);
if (r < 0)
return r;
@@ -2129,7 +2156,7 @@ int cg_unified(void) {
if (statfs("/sys/fs/cgroup/", &fs) < 0)
return -errno;
if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
unified_cache = true;
else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC))
unified_cache = false;
src/basic/cgroup-util.h
+2
View File
@@ -96,6 +96,8 @@ static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
int cg_read_pid(FILE *f, pid_t *_pid);
int cg_read_event(const char *controller, const char *path, const char *event,
char **val);
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
int cg_read_subgroup(DIR *d, char **fn);
src/basic/missing.h
+4
View File
@@ -437,6 +437,10 @@ struct btrfs_ioctl_quota_ctl_args {
#define CGROUP_SUPER_MAGIC 0x27e0eb
#endif
#ifndef CGROUP2_SUPER_MAGIC
#define CGROUP2_SUPER_MAGIC 0x63677270
#endif
#ifndef TMPFS_MAGIC
#define TMPFS_MAGIC 0x01021994
#endif
src/core/cgroup.c
+3 -3
View File
@@ -765,7 +765,7 @@ int unit_set_cgroup_path(Unit *u, const char *path) {
}
int unit_watch_cgroup(Unit *u) {
_cleanup_free_ char *populated = NULL;
_cleanup_free_ char *events = NULL;
int r;
assert(u);
@@ -791,11 +791,11 @@ int unit_watch_cgroup(Unit *u) {
if (r < 0)
return log_oom();
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated);
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
if (r < 0)
return log_oom();
u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY);
u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
if (u->cgroup_inotify_wd < 0) {
if (errno == ENOENT) /* If the directory is already
src/core/manager.c
+3 -1
View File
@@ -1631,7 +1631,9 @@ static void invoke_sigchld_event(Manager *m, Unit *u, const siginfo_t *si) {
log_unit_debug(u, "Child "PID_FMT" belongs to %s", si->si_pid, u->id);
unit_unwatch_pid(u, si->si_pid);
UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status);
if (UNIT_VTABLE(u)->sigchld_event)
UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status);
}
static int manager_dispatch_sigchld(Manager *m) {
src/core/mount-setup.c
+1 -1
View File
@@ -94,7 +94,7 @@ static const MountPoint mount_table[] = {
#endif
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
NULL, MNT_FATAL|MNT_IN_CONTAINER },
{ "cgroup", "/sys/fs/cgroup", "cgroup", "__DEVEL__sane_behavior", MS_NOSUID|MS_NOEXEC|MS_NODEV,
{ "cgroup", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
cg_is_unified_wanted, MNT_FATAL|MNT_IN_CONTAINER },
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
src/nspawn/nspawn-cgroup.c
+2 -3
View File
@@ -55,8 +55,7 @@ int chown_cgroup(pid_t pid, uid_t uid_shift) {
"cgroup.events",
"cgroup.clone_children",
"cgroup.controllers",
"cgroup.subtree_control",
"cgroup.populated")
"cgroup.subtree_control")
if (fchownat(fd, fn, uid_shift, uid_shift, 0) < 0)
log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
"Failed to chown() cgroup file %s, ignoring: %m", fn);
@@ -94,7 +93,7 @@ int sync_cgroup(pid_t pid, bool unified_requested) {
if (unified)
r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "none,name=systemd,xattr");
else
r = mount("cgroup", tree, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior");
r = mount("cgroup", tree, "cgroup2", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
if (r < 0) {
r = log_error_errno(errno, "Failed to mount unified hierarchy: %m");
goto finish;
src/nspawn/nspawn-mount.c
+1 -1
View File
@@ -750,7 +750,7 @@ static int mount_unified_cgroups(const char *dest) {
return -EINVAL;
}
if (mount("cgroup", p, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, "__DEVEL__sane_behavior") < 0)
if (mount("cgroup", p, "cgroup2", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) < 0)
return log_error_errno(errno, "Failed to mount unified cgroup hierarchy to %s: %m", p);
return 0;