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b40ce4165d
Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
109 lines
2.1 KiB
C
109 lines
2.1 KiB
C
/*-
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* Copyright (c) 2000, All rights reserved. See /usr/src/COPYRIGHT
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*
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* $FreeBSD$
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*/
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/smp.h>
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#include <sys/unistd.h>
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#ifdef KTRACE
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#include <sys/uio.h>
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#include <sys/ktrace.h>
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#endif
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static void idle_setup(void *dummy);
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SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
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static void idle_proc(void *dummy);
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/*
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* Setup per-cpu idle process contexts. The AP's shouldn't be running or
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* accessing their idle processes at this point, so don't bother with
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* locking.
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*/
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static void
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idle_setup(void *dummy)
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{
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#ifdef SMP
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struct globaldata *gd;
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#endif
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struct proc *p;
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int error;
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#ifdef SMP
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SLIST_FOREACH(gd, &cpuhead, gd_allcpu) {
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error = kthread_create(idle_proc, NULL, &p,
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RFSTOPPED | RFHIGHPID, "idle: cpu%d", gd->gd_cpuid);
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gd->gd_idlethread = &p->p_thread;
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if (gd->gd_curthread == NULL)
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gd->gd_curthread = gd->gd_idlethread;
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#else
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error = kthread_create(idle_proc, NULL, &p,
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RFSTOPPED | RFHIGHPID, "idle");
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PCPU_SET(idlethread, &p->p_thread);
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#endif
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if (error)
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panic("idle_setup: kthread_create error %d\n", error);
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p->p_flag |= P_NOLOAD;
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p->p_stat = SRUN;
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#ifdef SMP
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}
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#endif
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}
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/*
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* idle process context
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*/
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static void
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idle_proc(void *dummy)
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{
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#ifdef DIAGNOSTIC
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int count;
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#endif
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for (;;) {
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mtx_assert(&Giant, MA_NOTOWNED);
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#ifdef DIAGNOSTIC
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count = 0;
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while (count >= 0 && procrunnable() == 0) {
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#else
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while (procrunnable() == 0) {
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#endif
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/*
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* This is a good place to put things to be done in
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* the background, including sanity checks.
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*/
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#ifdef DIAGNOSTIC
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if (count++ < 0)
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CTR0(KTR_PROC, "idle_proc: timed out waiting"
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" for a process");
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#endif
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#ifdef __i386__
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cpu_idle();
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#endif
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}
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mtx_lock_spin(&sched_lock);
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curproc->p_stats->p_ru.ru_nvcsw++;
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mi_switch();
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mtx_unlock_spin(&sched_lock);
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}
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}
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