tree be80d87679ff53825c12532605a41f1470d1e3c8
parent b562e44f507e863c6792946e4e1b1449fbbac85d
author Alex Shi <alex.shi@linaro.org> 1455698115 +0800
committer Alex Shi <alex.shi@linaro.org> 1458529769 +0800

sched: use the idle cpu in interrupting

Use the interrupting idle cpu instead of the shallowest one could
save cpu power. After send a task to the idle cpu, the cpu isn't
idle, so after the irq, it won't enter into cpu idle again, instead
the cpu exit from cpu idle and try to wakeup task in the rq.

But need to measure the latency change, since the shallowest idle
cpu's wakeup time could compete with interrupt job.