Now
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Just a few optimizations.
- in cpu_idle(), ci_intr_depth is always 0, so there is no need to fetch for increment or conditional branch.
- curcpu() is immutable in idle lwp, there is no need to consider KPREEMPT. Therefore, get curcpu() first and keep using it.
- add more comment.
- in cpu_idle(), ci_intr_depth is always 0, so there is no need to fetch for increment or conditional branch.
- curcpu() is immutable in idle lwp, there is no need to consider KPREEMPT. Therefore, get curcpu() first and keep using it.
- add more comment.