Improve cpuset support for surfaceflinger.
SurfaceFlinger needs some of its threads in the system-background cpuset
and some of its threads (the binder pool) outside of the
system-background cpuset in order to improve UI perf/power
consumption. Remove surfaceflinger from the system-background cpuset in
init.rc and allow a thread to place itself in the system-background
cpuset given enough permissions.
bug 25745866
Change-Id: I85f7e41c5439e6ad7cc2d355e51f5dfb3a0c7088
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 317207c..4cc3f73 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -165,13 +165,19 @@
chown system system /dev/cpuset/foreground
chown system system /dev/cpuset/foreground/boost
chown system system /dev/cpuset/background
+ chown system system /dev/cpuset/system-background
chown system system /dev/cpuset/tasks
chown system system /dev/cpuset/foreground/tasks
chown system system /dev/cpuset/foreground/boost/tasks
chown system system /dev/cpuset/background/tasks
+ chown system system /dev/cpuset/system-background/tasks
+
+ # set system-background to 0775 so SurfaceFlinger can touch it
+ chmod 0775 /dev/cpuset/system-background
chmod 0664 /dev/cpuset/foreground/tasks
chmod 0664 /dev/cpuset/foreground/boost/tasks
chmod 0664 /dev/cpuset/background/tasks
+ chmod 0664 /dev/cpuset/system-background/tasks
chmod 0664 /dev/cpuset/tasks
@@ -646,7 +652,6 @@
user system
group graphics drmrpc
onrestart restart zygote
- writepid /dev/cpuset/system-background/tasks
service drm /system/bin/drmserver
class main