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Use wfi to sleep a cpu if no process is found while cycling pool#9

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Virtual-Machine wants to merge 1 commit intoo8vm:mainfrom
Virtual-Machine:SchedulerWFI
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Use wfi to sleep a cpu if no process is found while cycling pool#9
Virtual-Machine wants to merge 1 commit intoo8vm:mainfrom
Virtual-Machine:SchedulerWFI

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@Virtual-Machine
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This pull request is to propose a minor change on how the scheduler works.

This PR should resolve #8 in which CPU utilization is high when running in QEMU.

This is a fix proposed in xv6-riscv as well (see mit-pdos/xv6-riscv#15) and is at least personally verified as lowering CPU utilization on my Macbook. I am not sure if there are any possible unintended side effects of this change, so additional testing and verification may be warranted.

@sword-jin
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Awesome man, This fix is gona save my PC.

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Octox running in qemu consumes 400% cpu time

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