From 726a68cb401538da8843ee3521e7bd8f81823e48 Mon Sep 17 00:00:00 2001
From: Marco Ballesio <balejs@google.com>
Date: Tue, 8 Oct 2019 09:12:22 -0700
Subject: [PATCH] Add support for freezer cgroup

Adds the freezer cgroup to process groups

Change-Id: Ib7a8dbe776ff156ff3827b9a659365384f3e6ac8
Bug: 143308662
Test: manual - frozen processes aren't scheduled for execution until
unfrozen
---
 libprocessgroup/profiles/cgroups.json       |  7 ++++++
 libprocessgroup/profiles/task_profiles.json | 26 +++++++++++++++++++++
 rootdir/init.rc                             | 10 ++++++++
 3 files changed, 43 insertions(+)

diff --git a/libprocessgroup/profiles/cgroups.json b/libprocessgroup/profiles/cgroups.json
index 5871a63fa..03419020c 100644
--- a/libprocessgroup/profiles/cgroups.json
+++ b/libprocessgroup/profiles/cgroups.json
@@ -39,6 +39,13 @@
       "Mode": "0755",
       "UID": "system",
       "GID": "system"
+    },
+    {
+      "Controller": "freezer",
+      "Path": "/dev/freezer",
+      "Mode": "0755",
+      "UID": "system",
+      "GID": "system"
     }
   ],
   "Cgroups2": {
diff --git a/libprocessgroup/profiles/task_profiles.json b/libprocessgroup/profiles/task_profiles.json
index 608f0071e..3f3dbd72d 100644
--- a/libprocessgroup/profiles/task_profiles.json
+++ b/libprocessgroup/profiles/task_profiles.json
@@ -66,6 +66,32 @@
         }
       ]
     },
+    {
+      "Name": "Frozen",
+      "Actions": [
+        {
+          "Name": "JoinCgroup",
+          "Params":
+          {
+            "Controller": "freezer",
+            "Path": "frozen"
+          }
+        }
+      ]
+    },
+    {
+      "Name": "Unfrozen",
+      "Actions": [
+        {
+          "Name": "JoinCgroup",
+          "Params":
+          {
+            "Controller": "freezer",
+            "Path": ""
+          }
+        }
+      ]
+    },
     {
       "Name": "NormalPerformance",
       "Actions": [
diff --git a/rootdir/init.rc b/rootdir/init.rc
index bc18e2746..674b7372d 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -283,6 +283,16 @@ on init
     chmod 0664 /dev/cpuset/restricted/tasks
     chmod 0664 /dev/cpuset/tasks
 
+    # freezer cgroup entries
+    mkdir /dev/freezer/frozen
+    write /dev/freezer/frozen/freezer.state FROZEN
+    chown system system /dev/freezer/cgroup.procs
+    chown system system /dev/freezer/frozen
+    chown system system /dev/freezer/frozen/freezer.state
+    chown system system /dev/freezer/frozen/cgroup.procs
+
+    chmod 0444 /dev/freezer/frozen/freezer.state
+
     # make the PSI monitor accessible to others
     chown system system /proc/pressure/memory
     chmod 0664 /proc/pressure/memory