079b7badea
this is a low-functionality change that changes the kernel to access the main thread of a process via the linked list of threads rather than assuming that it is embedded in the process. It IS still embeded there but remove all teh code that assumes that in preparation for the next commit which will actually move it out. Reviewed by: peter@freebsd.org, gallatin@cs.duke.edu, benno rice,
111 lines
2.1 KiB
C
111 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 pcpu *pc;
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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(pc, &cpuhead, pc_allcpu) {
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error = kthread_create(idle_proc, NULL, &p,
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RFSTOPPED | RFHIGHPID, "idle: cpu%d", pc->pc_cpuid);
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pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
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if (pc->pc_curthread == NULL) {
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pc->pc_curthread = pc->pc_idlethread;
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pc->pc_idlethread->td_critnest = 0;
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}
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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, FIRST_THREAD_IN_PROC(p));
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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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