Now
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Take some pressure from vdrain lock:
- Use cv_signal() instead of cv_broadcast(), there is only one waiter.
- No need to signal if number of vnodes doesn't increase.
- Use kpause(1) instead of yield().
- Use cv_signal() instead of cv_broadcast(), there is only one waiter.
- No need to signal if number of vnodes doesn't increase.
- Use kpause(1) instead of yield().