kern_idle.c revision 173004
1279264Sdelphij/*- 2110010Smarkm * Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved. 3110010Smarkm * 4142429Snectar * Redistribution and use in source and binary forms, with or without 5110010Smarkm * modification, are permitted provided that the following conditions 6110010Smarkm * are met: 7110010Smarkm * 1. Redistributions of source code must retain the above copyright 8110010Smarkm * notice, this list of conditions and the following disclaimer. 9110010Smarkm * 2. Redistributions in binary form must reproduce the above copyright 10110010Smarkm * notice, this list of conditions and the following disclaimer in the 11110010Smarkm * documentation and/or other materials provided with the distribution. 12110010Smarkm * 13110010Smarkm * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14110010Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15110010Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16110010Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17110010Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18110010Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19110010Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20215698Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21215698Ssimon * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22215698Ssimon * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23215698Ssimon * SUCH DAMAGE. 24215698Ssimon */ 25110010Smarkm 26110010Smarkm#include <sys/cdefs.h> 27110010Smarkm__FBSDID("$FreeBSD: head/sys/kern/kern_idle.c 173004 2007-10-26 08:00:41Z julian $"); 28110010Smarkm 29110010Smarkm#include <sys/param.h> 30110010Smarkm#include <sys/systm.h> 31110010Smarkm#include <sys/kernel.h> 32110010Smarkm#include <sys/kthread.h> 33110010Smarkm#include <sys/lock.h> 34110010Smarkm#include <sys/mutex.h> 35110010Smarkm#include <sys/proc.h> 36110010Smarkm#include <sys/resourcevar.h> 37110010Smarkm#include <sys/sched.h> 38110010Smarkm#include <sys/unistd.h> 39110010Smarkm#ifdef SMP 40110010Smarkm#include <sys/smp.h> 41279264Sdelphij#endif 42279264Sdelphij 43110010Smarkmstatic void idle_setup(void *dummy); 44110010SmarkmSYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL) 45215698Ssimon 46215698Ssimon/* 47215698Ssimon * Set up per-cpu idle process contexts. The AP's shouldn't be running or 48215698Ssimon * accessing their idle processes at this point, so don't bother with 49142429Snectar * locking. 50215698Ssimon */ 51142429Snectarstatic void 52142429Snectaridle_setup(void *dummy) 53279264Sdelphij{ 54279264Sdelphij#ifdef SMP 55279264Sdelphij struct pcpu *pc; 56110010Smarkm#endif 57279264Sdelphij struct proc *p; 58279264Sdelphij struct thread *td; 59279264Sdelphij int error; 60279264Sdelphij 61279264Sdelphij#ifdef SMP 62279264Sdelphij SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 63215698Ssimon#endif 64279264Sdelphij error = kproc_kthread_add(sched_idletd, NULL, &p, &td, 65279264Sdelphij RFSTOPPED | RFHIGHPID, 0, "idled", "idle: cpu%d", pc->pc_cpuid); 66279264Sdelphij#ifdef SMP 67279264Sdelphij pc->pc_idlethread = td; 68279264Sdelphij#else 69215698Ssimon PCPU_SET(idlethread, td); 70279264Sdelphij#endif 71110010Smarkm p = td->td_proc; 72110010Smarkm if (error) 73110010Smarkm panic("idle_setup: kproc_create error %d\n", error); 74110010Smarkm 75110010Smarkm p->p_flag |= P_NOLOAD; 76110010Smarkm thread_lock(td); 77110010Smarkm TD_SET_CAN_RUN(td); 78110010Smarkm td->td_flags |= TDF_IDLETD; 79110010Smarkm sched_class(td, PRI_IDLE); 80110010Smarkm sched_prio(td, PRI_MAX_IDLE); 81110010Smarkm thread_unlock(td); 82110010Smarkm#ifdef SMP 83110010Smarkm } 84110010Smarkm#endif 85110010Smarkm} 86110010Smarkm