ANDROID: sched/fair: Add a backup_cpu to find_best_target

Sometimes we find a target cpu but then we do not use it as
the energy_diff indicates that we would increase energy usage
or not save anything. To offer an additional option for those
cases, we return a second option which is what we would have
selected if the target CPU had not been found. This gives us
another chance to try to save some energy.

Change-Id: I42c4f20aba10e4cf65b51ac4153e2e00e534c8c7
Signed-off-by: Chris Redpath <>
Signed-off-by: Patrick Bellasi <>
(cherry picked from commit 426e11af9e415437d857e0f3cc5215b43a7cee08)
[Fixed cherry-pick issue]
Signed-off-by: Quentin Perret <>
1 file changed