linux-imx

ANDROID: sched: Enable idle balance to pull single task towards cpu with higher capacity

We do not want to miss out on the ability to pull a single remaining
task from a potential source cpu towards an idle destination cpu. Add an
extra criteria to need_active_balance() to kick off active load balance
if the source cpu is over-utilized and has lower capacity than the
destination cpu.

Change-Id: Iea3b42b2a0f8d8a4252e42ba67cc33381a4a1075
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
(Fixed rebase conflict caused by the introduction of
voluntary_active_balance() in "46a745d90585 sched/fair: Fix unnecessary
increase of balance interval")
Signed-off-by: Quentin Perret <quentin.perret@arm.com>