sched: group-scheduler core

Add interface to control cpu bandwidth allocation to task-groups.

(not yet configurable, due to missing CONFIG_CONTAINERS)

Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

diff --cc init/Kconfig
Simple merge

diff --cc kernel/sched.c
Simple merge

diff --cc kernel/sched_fair.c
Simple merge

diff --cc kernel/sched_idletask.c
Simple merge

diff --cc kernel/sched_rt.c
Simple merge