125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
/*-
|
|
* Copyright (c) 2000, All rights reserved. See /usr/src/COPYRIGHT
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_ktrace.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/pcpu.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/sched.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/unistd.h>
|
|
#ifdef KTRACE
|
|
#include <sys/uio.h>
|
|
#include <sys/ktrace.h>
|
|
#endif
|
|
|
|
static void idle_setup(void *dummy);
|
|
SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
|
|
|
|
static void idle_proc(void *dummy);
|
|
|
|
/*
|
|
* Setup per-cpu idle process contexts. The AP's shouldn't be running or
|
|
* accessing their idle processes at this point, so don't bother with
|
|
* locking.
|
|
*/
|
|
static void
|
|
idle_setup(void *dummy)
|
|
{
|
|
#ifdef SMP
|
|
struct pcpu *pc;
|
|
#endif
|
|
struct proc *p;
|
|
struct thread *td;
|
|
int error;
|
|
|
|
#ifdef SMP
|
|
SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
|
|
error = kthread_create(idle_proc, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
|
|
pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
|
|
if (pc->pc_curthread == NULL) {
|
|
pc->pc_curthread = pc->pc_idlethread;
|
|
pc->pc_idlethread->td_critnest = 0;
|
|
}
|
|
#else
|
|
error = kthread_create(idle_proc, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, 0, "idle");
|
|
PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
|
|
#endif
|
|
if (error)
|
|
panic("idle_setup: kthread_create error %d\n", error);
|
|
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_NOLOAD;
|
|
mtx_lock_spin(&sched_lock);
|
|
p->p_state = PRS_NORMAL;
|
|
td = FIRST_THREAD_IN_PROC(p);
|
|
td->td_state = TDS_CAN_RUN;
|
|
td->td_kse->ke_flags |= KEF_IDLEKSE;
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_UNLOCK(p);
|
|
#ifdef SMP
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* idle process context
|
|
*/
|
|
static void
|
|
idle_proc(void *dummy)
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
int count;
|
|
#endif
|
|
struct thread *td;
|
|
struct proc *p;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
for (;;) {
|
|
mtx_assert(&Giant, MA_NOTOWNED);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
count = 0;
|
|
|
|
while (count >= 0 && sched_runnable() == 0) {
|
|
#else
|
|
while (sched_runnable() == 0) {
|
|
#endif
|
|
/*
|
|
* This is a good place to put things to be done in
|
|
* the background, including sanity checks.
|
|
*/
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (count++ < 0)
|
|
CTR0(KTR_PROC, "idle_proc: timed out waiting"
|
|
" for a process");
|
|
#endif
|
|
|
|
#ifdef __i386__
|
|
cpu_idle();
|
|
#endif
|
|
}
|
|
|
|
mtx_lock_spin(&sched_lock);
|
|
p->p_stats->p_ru.ru_nvcsw++;
|
|
td->td_state = TDS_CAN_RUN;
|
|
mi_switch();
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
}
|