/* SPDX-License-Identifier: LGPL-2.1+ */
/***
- This file is part of systemd.
-
Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
slice_state_to_string(old_state),
slice_state_to_string(state));
- unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
+ unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], 0);
}
static int slice_add_parent_slice(Slice *s) {
if (r < 0)
return r;
- unit_ref_set(&u->slice, parent);
+ unit_ref_set(&u->slice, u, parent);
return 0;
}
if (!slice_name_is_valid(UNIT(s)->id)) {
log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id);
- return -EINVAL;
+ return -ENOEXEC;
}
r = slice_build_parent_slice(UNIT(s)->id, &parent);
if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) {
log_unit_error(UNIT(s), "Located outside of parent slice. Refusing.");
- return -EINVAL;
+ return -ENOEXEC;
}
return 0;
* special semantics we synthesize it here, instead of relying on the unit file on disk. */
u->default_dependencies = false;
- u->ignore_on_isolate = true;
if (!u->description)
u->description = strdup("Root Slice");
return 1;
}
+static int slice_load_system_slice(Unit *u) {
+ assert(u);
+
+ if (!MANAGER_IS_SYSTEM(u->manager))
+ return 0;
+ if (!unit_has_name(u, SPECIAL_SYSTEM_SLICE))
+ return 0;
+
+ u->perpetual = true;
+
+ /* The system slice is a bit special. For example it is always running and cannot be terminated. Because of its
+ * special semantics we synthesize it here, instead of relying on the unit file on disk. */
+
+ u->default_dependencies = false;
+
+ if (!u->description)
+ u->description = strdup("System Slice");
+ if (!u->documentation)
+ u->documentation = strv_new("man:systemd.special(7)", NULL);
+
+ return 1;
+}
+
static int slice_load(Unit *u) {
Slice *s = SLICE(u);
int r;
r = slice_load_root_slice(u);
if (r < 0)
return r;
+ r = slice_load_system_slice(u);
+ if (r < 0)
+ return r;
+
r = unit_load_fragment_and_dropin_optional(u);
if (r < 0)
return r;
return slice_state_to_string(SLICE(u)->state);
}
-static void slice_enumerate(Manager *m) {
+static int slice_make_perpetual(Manager *m, const char *name, Unit **ret) {
Unit *u;
int r;
assert(m);
+ assert(name);
- u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
+ u = manager_get_unit(m, name);
if (!u) {
- r = unit_new_for_name(m, sizeof(Slice), SPECIAL_ROOT_SLICE, &u);
- if (r < 0) {
- log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_SLICE " unit: %m");
- return;
- }
+ r = unit_new_for_name(m, sizeof(Slice), name, &u);
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate the special %s unit: %m", name);
}
u->perpetual = true;
unit_add_to_load_queue(u);
unit_add_to_dbus_queue(u);
+
+ if (ret)
+ *ret = u;
+
+ return 0;
+}
+
+static void slice_enumerate_perpetual(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ r = slice_make_perpetual(m, SPECIAL_ROOT_SLICE, &u);
+ if (r >= 0 && manager_owns_root_cgroup(m)) {
+ Slice *s = SLICE(u);
+
+ /* If we are managing the root cgroup then this means our root slice covers the whole system, which
+ * means the kernel will track CPU/tasks/memory for us anyway, and it is all available in /proc. Let's
+ * hence turn accounting on here, so that our APIs to query this data are available. */
+
+ s->cgroup_context.cpu_accounting = true;
+ s->cgroup_context.tasks_accounting = true;
+ s->cgroup_context.memory_accounting = true;
+ }
+
+ if (MANAGER_IS_SYSTEM(m))
+ (void) slice_make_perpetual(m, SPECIAL_SYSTEM_SLICE, NULL);
}
const UnitVTable slice_vtable = {
.bus_set_property = bus_slice_set_property,
.bus_commit_properties = bus_slice_commit_properties,
- .enumerate = slice_enumerate,
+ .enumerate_perpetual = slice_enumerate_perpetual,
.status_message_formats = {
.finished_start_job = {
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