commit 4284f9f3a3d471208d7a9341056e4d7af886dab3
author Tim Murray <timmurray@google.com> Tue Nov 10 14:31:09 2015 -0800
committer Tim Murray <timmurray@google.com> Fri Jan 22 14:06:50 2016 -0800
tree a4b8375cc7d01296fd2a0624bc25992264ba8e6d
parent 3b299d55e75e81453d31a41b69dddf8ff3f06bbb

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

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index a839729..1575c10 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -180,6 +180,10 @@
     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