add property to adjust extra_free_kbytes kernel vm tunable

ActivityManager can't directly write to extra_free_kbytes because
/proc/sys rejects all chown and chmod syscalls.  Proxy the writes
through init by using the sys.sysctl.extra_free_kbytes property.

Bug: 10024467
Change-Id: I441e00478421254355fcafb252bc878166483d4c

parent 44f5c157

rootdir/init.rc

+4 −0

Original line number	Diff line number	Diff line
		@@ -402,6 +402,10 @@ on property:vold.decrypt=trigger_shutdown_framework
		on property:sys.powerctl=*
		powerctl ${sys.powerctl}

		# system server cannot write to /proc/sys files, so proxy it through init
		on property:sys.sysctl.extra_free_kbytes=*
		write /proc/sys/vm/extra_free_kbytes ${sys.sysctl.extra_free_kbytes}

		## Daemon processes to be run by init.
		##
		service ueventd /sbin/ueventd