INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

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CSF (9) NetBSD Kernel Developer’s Manual CSF (9)Core scheduler functionsvoid sched_tick(struct cpu_info ∗)Periodically called from hardclock(9). Determines if a reschedule is necessary, ifthe runningLWPhas used up its quantum.void sched_schedclock(lwp_t ∗)Periodically called from schedclock() in order to handle priority adjustment.Priority adjustmentvoid sched_nice(struct proc ∗, int)Recalculate the process priority according to its nice value.General helper functionsvoid sched_proc_fork(struct proc ∗ , struct proc ∗)Inherit the scheduling history of the parent process after fork().void sched_proc_exit(struct proc ∗ , struct proc ∗)Charge back a processes parent for its resource usage.void sched_lwp_fork(lwp_t ∗)LWP-specific version of the abovevoid sched_lwp_exit(lwp_t ∗)LWP-specific version of the abovevoid sched_setrunnable(lwp_t ∗)Scheduler-specific actions for setrunnable().void sched_pstats_hook(struct proc ∗ , int)Scheduler-specific actions for sched_pstats().Common scheduler functionspri_t sched_kpri(lwp_t ∗)Scale a priority level toakernel priority level, usually for an LWP that is about to sleep.void sched_pstats(void ∗)Update process statistics and check CPU resource allocation.inline void resched_cpu(lwp_t ∗)Arrange for a reschedule.void setrunnable(lwp_t ∗)Change process state to be runnable, placing it on a runqueue if it is in memory, awakening theswapper otherwise.void schedclock(lwp_t ∗)Scheduler clock. Periodically called from statclock().void sched_init(void)Initialize callout for sched_pstats() and call sched_setup() to initialize any other scheduler-specificdata.CODE REFERENCESThis section describes places within the NetBSD source tree where actual code implementing the schedulercan be found. All pathnames are relative to /usr/src.NetBSD 3.0 July 14, 2007 3
CSF (9) NetBSD Kernel Developer’s Manual CSF (9)The CSF programming interface is defined within the file sys/sys/sched.h.Functions common to all scheduler implementations are in sys/kern/kern_synch.c.The traditional 4.4BSD scheduler is implemented in sys/kern/sched_4bsd.c.SEE ALSOmi_switch(9), preempt(9), sched_4bsd(9)HISTORYThe CSF appeared in NetBSD 5.0.AUTHORSThe CSF was written by Daniel Sieger 〈dsieger@NetBSD.org〉.NetBSD 3.0 July 14, 2007 4
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