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131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*-
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* Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/unistd.h>
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#ifdef SMP
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#include <sys/smp.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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* Set up 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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struct thread *td;
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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, 0, "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, 0, "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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PROC_LOCK(p);
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p->p_flag |= P_NOLOAD;
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mtx_lock_spin(&sched_lock);
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td = FIRST_THREAD_IN_PROC(p);
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TD_SET_CAN_RUN(td);
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td->td_flags |= TDF_IDLETD;
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td->td_priority = PRI_MAX_IDLE;
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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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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* The actual idle process.
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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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struct proc *p;
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struct thread *td;
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#ifdef SMP
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cpumask_t mycpu;
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#endif
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td = curthread;
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p = td->td_proc;
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#ifdef SMP
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mycpu = PCPU_GET(cpumask);
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mtx_lock_spin(&sched_lock);
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idle_cpus_mask |= mycpu;
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mtx_unlock_spin(&sched_lock);
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#endif
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for (;;) {
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mtx_assert(&Giant, MA_NOTOWNED);
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while (sched_runnable() == 0)
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cpu_idle();
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mtx_lock_spin(&sched_lock);
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#ifdef SMP
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idle_cpus_mask &= ~mycpu;
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#endif
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mi_switch(SW_VOL, NULL);
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#ifdef SMP
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idle_cpus_mask |= mycpu;
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#endif
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mtx_unlock_spin(&sched_lock);
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}
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}
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