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sched-rr: A round-robin scheduler for normal thread #129

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sched-rr: A round-robin scheduler for normal thread #129

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Commits on Oct 10, 2016

  1. sched-rr: A round-robin scheduler for normal thread 

    This is a round-robin scheduler implement for normal thread (user-thread)
create by pager or pthread lib, and using timeslice, we can prevent user-space
thread starvation trigger by busy loop.

This scheduler only schedling user thread create by ipc "thread start protocal".

Default timeslice is 4096 ticks for now.

Other trivial change:
- Update defconfing for all board
- Add sched-rr into Makefile
- Add new config in kernel/Kconfig for setting thread timeslice
    Louie Lu committed Oct 10, 2016
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