Revert "sched/fair: Optimize find_busiest_queue()"

This reverts commit ca6e6eaab1a48d7816a44c0aa31b29769635103e.
Revert "sched/fair: Optimize cgroup pick_next_task_fair()"

This reverts commit ddc12dcc90e4804b2f9e71d1dd8ed96e4ba16db8.
Revert "sched: reinitialize rq->next_balance when a CPU is hot-added"

This reverts commit bd375e6a11db711ca5b91e16e955fcb1fa55c06f.
Revert "mm: vmscan: If kswapd has been running too long, allow it to sleep"

This reverts commit e8d5e74f4f91dd5762770bd352c4f3e34446765c.
Revert "ksm: Provide support to use deferred timers for scanner thread"

This reverts commit 9fe5eac64d9210e392e0e65e5a2042273afa6a0b.