X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=README;h=0cd868ade28b70e40163bbb3ddfca44f0e536b8c;hp=e08b1ddd0a74a313e9f7ba6dfd1e20b85d09c745;hb=cac2e345596b2743053c0285280b81794b3aaf10;hpb=ae695cb23d75f9b43f0a302285bfae6a7565d6cc

diff --git a/README b/README
index e08b1ddd0..0cd868ade 100644
--- a/README
+++ b/README
@@ -102,7 +102,7 @@ Elogind does not manage virtual terminals.
 
 Elogind does monitor power button and the lid switch, like systemd,
 but instead of doing RPC to systemd to suspend, poweroff, or restart
-the machine, elogind just does this directly.  For suspend, hybernate,
+the machine, elogind just does this directly.  For suspend, hibernate,
 and hybrid-sleep, elogind uses the same code as systemd-sleep.
 Instead of using a separate sleep.conf file to configure the sleep
 behavior, this is included in the [Sleep] section of
@@ -116,6 +116,32 @@ flag.
 
 The PAM module is called pam_elogind.so, not pam_systemd.so.
 
+Elogind and the running cgroup controller
+-----------------------------------------
+While 'configure' runs, it will detect which controller is in place.
+If no controller is in place, configure will determine, that elogind
+should be its own controller, which will be a very limited one.
+
+This approach should generally work, but if you just have no cgroup
+controller in place, yet, or if you are currently switching to
+another one, this approach will fail.
+
+In this case you can do one of the two following things:
+
+ 1) Boot your system with the target init system and cgroup
+    controller, before configuring and building elogind, or
+ 2) Use the --with-cgroup-controller=name option.
+
+Example: If you plan to use openrc, but openrc has not yet booted
+         the machine, you can use
+         --with-cgroup-controller=openrc
+         to let elogind know that openrc will be the controller
+         in charge.
+
+However, if you set the controller at configure time to something
+different than what is in place, elogind will not start until that
+controller is actively used as the primary controller.
+
 License
 -------