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Asked: 2026-06-06T13:10:29+00:00

I am trying to implement some kind of new Linux task scheduler so I

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I am trying to implement some kind of new Linux task scheduler so I found this article http://www.eetimes.com/design/embedded/4204929/Real-Time-Linux-Scheduling-Part-1
is really helpful. However, it said that we not only need to define the new scheduling macro in /kernel-source-code/include/linux/sched.h but also need to define the same thing in /usr/include/bits/sched.h.

So why do we need to change the user space head file since the scheduler works in the kernel. I do not know why do we have the user space head file? Anyway the user space program can not use the function defined in the kernel directly (unless through a system call), right? And if we also need to change the user space file in order to implement a new scheduler, then how can the scheduler be portable since the user not only needs to use the new kernel image but also needs to change their user space file?

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1 Answer

  1. Editorial Team

    The article talks about adding a new class of scheduling, or new scheduling policy, and not about replacing kernel scheduling algorithm wholesale. You need userland process be able to select the policy with sched_setscheduler(2), thus the need for userland-visible header file.

    Take a look here for more details.

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