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From c46be83563a2d20a480988dab55404f941b9cc35 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 5 Nov 2013 22:14:52 +0100
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Subject: [PATCH] cgroup: run PID 1 in the root cgroup
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This way cleaning up the cgroup tree on shutdown is a lot easier since
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we are in the root dir. Also PID 1 was previously artificially placed in
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system.slice, even though our rule actually was not to have processes in
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slices. The root slice otoh is magic anyway, so having PID 1 in there
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sounds less surprising.
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Of course, this means that PID is scheduled against the three top-level
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slices.
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---
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src/core/cgroup.c | 16 ++++++++--------
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1 file changed, 8 insertions(+), 8 deletions(-)
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diff --git a/src/core/cgroup.c b/src/core/cgroup.c
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index b60707c..32e2599 100644
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--- a/src/core/cgroup.c
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+++ b/src/core/cgroup.c
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@@ -591,8 +591,8 @@ pid_t unit_search_main_pid(Unit *u) {
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int manager_setup_cgroup(Manager *m) {
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_cleanup_free_ char *path = NULL;
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+ char *e;
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int r;
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- char *e, *a;
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assert(m);
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@@ -612,9 +612,13 @@ int manager_setup_cgroup(Manager *m) {
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return r;
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}
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- /* Already in /system.slice? If so, let's cut this off again */
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+ /* LEGACY: Already in /system.slice? If so, let's cut this
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+ * off. This is to support live upgrades from older systemd
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+ * versions where PID 1 was moved there. */
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if (m->running_as == SYSTEMD_SYSTEM) {
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e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
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+ if (!e)
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+ e = endswith(m->cgroup_root, "/system");
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if (e)
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*e = 0;
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}
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@@ -645,12 +649,8 @@ int manager_setup_cgroup(Manager *m) {
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log_debug("Release agent already installed.");
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}
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- /* 4. Realize the system slice and put us in there */
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- if (m->running_as == SYSTEMD_SYSTEM) {
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- a = strappenda(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
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- r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, a, 0);
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- } else
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- r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0);
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+ /* 4. Make sure we are in the root cgroup */
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+ r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0);
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if (r < 0) {
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log_error("Failed to create root cgroup hierarchy: %s", strerror(-r));
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return r;
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