Change stop() to require the sched_lock as well as p's process lock to avoid silly lock contention on sched_lock since in 2 out of the 3 places that we call stop(), we get sched_lock right after calling it and we were locking sched_lock inside of stop() anyways.
Change stop() to require the sched_lock as well as p's process lock to
avoid silly lock contention on sched_lock since in 2 out of the 3 places
that we call stop(), we get sched_lock right after calling it and we were
locking sched_lock inside of stop() anyways.

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