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core: ensure init.scope is realized after drop-ins have been loaded

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If we add a drop-in for init.scope (e.g.: to set some memory limit),
it will be loaded long after the cgroup has already been realized.
Do it again when creating the special unit.

(cherry picked from commit 020b2e41ea)
This commit is contained in:
Luca Boccassi 2023-01-20 23:00:38 +00:00 committed by Zbigniew Jędrzejewski-Szmek
parent c2fef536d5
commit 786b7a7208
5 changed files with 15 additions and 1 deletions
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2
src/core/cgroup.c
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@ -2471,7 +2471,7 @@ static bool unit_has_mask_enables_realized(
((u->cgroup_enabled_mask | enable_mask) & CGROUP_MASK_V2) == (u->cgroup_enabled_mask & CGROUP_MASK_V2);
}
static void unit_add_to_cgroup_realize_queue(Unit *u) {
void unit_add_to_cgroup_realize_queue(Unit *u) {
assert(u);
if (u->in_cgroup_realize_queue)

1
src/core/cgroup.h
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@ -262,6 +262,7 @@ int unit_realize_cgroup(Unit *u);
void unit_prune_cgroup(Unit *u);
int unit_watch_cgroup(Unit *u);
int unit_watch_cgroup_memory(Unit *u);
void unit_add_to_cgroup_realize_queue(Unit *u);
void unit_release_cgroup(Unit *u);
/* Releases the cgroup only if it is recursively empty.

4
src/core/scope.c
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@ -789,6 +789,10 @@ static void scope_enumerate_perpetual(Manager *m) {
unit_add_to_load_queue(u);
unit_add_to_dbus_queue(u);
/* Enqueue an explicit cgroup realization here. Unlike other cgroups this one already exists and is
* populated (by us, after all!) already, even when we are not in a reload cycle. Hence we cannot
* apply the settings at creation time anymore, but let's at least apply them asynchronously. */
unit_add_to_cgroup_realize_queue(u);
}
static const char* const scope_result_table[_SCOPE_RESULT_MAX] = {

6
test/TEST-55-OOMD/test.sh
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@ -16,6 +16,12 @@ test_append_files() {
cat >>"${initdir:?}/etc/fstab" <<EOF
UUID=$(blkid -o value -s UUID "${LOOPDEV}p2") none swap defaults 0 0
EOF
mkdir -p "${initdir:?}/etc/systemd/system/init.scope.d/"
cat >>"${initdir:?}/etc/systemd/system/init.scope.d/test-55-oomd.conf" <<EOF
[Scope]
MemoryHigh=10G
EOF
)
}

3
test/units/testsuite-55.sh
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@ -5,6 +5,9 @@ set -o pipefail
systemd-analyze log-level debug
# Ensure that the init.scope.d drop-in is applied on boot
test "$(cat /sys/fs/cgroup/init.scope/memory.high)" != "max"
# Loose checks to ensure the environment has the necessary features for systemd-oomd
[[ -e /proc/pressure ]] || echo "no PSI" >>/skipped
cgroup_type="$(stat -fc %T /sys/fs/cgroup/)"