commit ab87979a006cedd067b988d1dfd6c617270302d5
author Wei Wang <wvw@google.com> Tue Nov 24 00:26:40 2020 -0800
committer Wei Wang <wvw@google.com> Tue Dec 01 19:46:02 2020 -0800
tree 6ed349bcacba103f53792dd129ef7ea8561f259a
parent 6a28572648bb5573c44a2a33f735ad86a8deb374

Add system-background cpu group

Add system-background cgroup hierarchy for uclamp and cpu bandwidth
tuning.

Bug: 170507876
Bug: 171740453
Test: boot and check cgroup
Change-Id: I41745e7b3ac5c1d7ea7dd77f5db39c6895047446

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index 6d497d1..9e1b6af 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -154,24 +154,28 @@
     mkdir /dev/cpuctl/top-app
     mkdir /dev/cpuctl/rt
     mkdir /dev/cpuctl/system
+    mkdir /dev/cpuctl/system-background
     chown system system /dev/cpuctl
     chown system system /dev/cpuctl/foreground
     chown system system /dev/cpuctl/background
     chown system system /dev/cpuctl/top-app
     chown system system /dev/cpuctl/rt
     chown system system /dev/cpuctl/system
+    chown system system /dev/cpuctl/system-background
     chown system system /dev/cpuctl/tasks
     chown system system /dev/cpuctl/foreground/tasks
     chown system system /dev/cpuctl/background/tasks
     chown system system /dev/cpuctl/top-app/tasks
     chown system system /dev/cpuctl/rt/tasks
     chown system system /dev/cpuctl/system/tasks
+    chown system system /dev/cpuctl/system-background/tasks
     chmod 0664 /dev/cpuctl/tasks
     chmod 0664 /dev/cpuctl/foreground/tasks
     chmod 0664 /dev/cpuctl/background/tasks
     chmod 0664 /dev/cpuctl/top-app/tasks
     chmod 0664 /dev/cpuctl/rt/tasks
     chmod 0664 /dev/cpuctl/system/tasks
+    chmod 0664 /dev/cpuctl/system-background/tasks
 
     # Create a cpu group for NNAPI HAL processes
     mkdir /dev/cpuctl/nnapi-hal
@@ -196,7 +200,7 @@
     # Surfaceflinger is in FG group so giving it a bit more
     write /dev/cpuctl/foreground/cpu.rt_runtime_us 450000
     write /dev/cpuctl/foreground/cpu.rt_period_us 1000000
-    write /dev/cpuctl/background/cpu.rt_runtime_us 100000
+    write /dev/cpuctl/background/cpu.rt_runtime_us 50000
     write /dev/cpuctl/background/cpu.rt_period_us 1000000
     write /dev/cpuctl/top-app/cpu.rt_runtime_us 100000
     write /dev/cpuctl/top-app/cpu.rt_period_us 1000000
@@ -204,6 +208,8 @@
     write /dev/cpuctl/rt/cpu.rt_period_us 1000000
     write /dev/cpuctl/system/cpu.rt_runtime_us 100000
     write /dev/cpuctl/system/cpu.rt_period_us 1000000
+    write /dev/cpuctl/system-background/cpu.rt_runtime_us 50000
+    write /dev/cpuctl/system-background/cpu.rt_period_us 1000000
     write /dev/cpuctl/nnapi-hal/cpu.rt_runtime_us 50000
     write /dev/cpuctl/nnapi-hal/cpu.rt_period_us 1000000
     write /dev/cpuctl/camera-daemon/cpu.rt_runtime_us 50000