The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_idle.c

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    1 /*-
    2  * Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/6.0/sys/kern/kern_idle.c 144637 2005-04-04 21:53:56Z jhb $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <sys/kthread.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/resourcevar.h>
   37 #include <sys/sched.h>
   38 #include <sys/unistd.h>
   39 #ifdef SMP
   40 #include <sys/smp.h>
   41 #endif
   42 
   43 static void idle_setup(void *dummy);
   44 SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL)
   45 
   46 static void idle_proc(void *dummy);
   47 
   48 /*
   49  * Set up per-cpu idle process contexts.  The AP's shouldn't be running or
   50  * accessing their idle processes at this point, so don't bother with
   51  * locking.
   52  */
   53 static void
   54 idle_setup(void *dummy)
   55 {
   56 #ifdef SMP
   57         struct pcpu *pc;
   58 #endif
   59         struct proc *p;
   60         struct thread *td;
   61         int error;
   62 
   63 #ifdef SMP
   64         SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
   65                 error = kthread_create(idle_proc, NULL, &p,
   66                     RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
   67                 pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
   68 #else
   69                 error = kthread_create(idle_proc, NULL, &p,
   70                     RFSTOPPED | RFHIGHPID, 0, "idle");
   71                 PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
   72 #endif
   73                 if (error)
   74                         panic("idle_setup: kthread_create error %d\n", error);
   75 
   76                 PROC_LOCK(p);
   77                 p->p_flag |= P_NOLOAD;
   78                 mtx_lock_spin(&sched_lock);
   79                 td = FIRST_THREAD_IN_PROC(p);
   80                 TD_SET_CAN_RUN(td);
   81                 td->td_flags |= TDF_IDLETD;
   82                 sched_class(td->td_ksegrp, PRI_IDLE);
   83                 sched_prio(td, PRI_MAX_IDLE);
   84                 mtx_unlock_spin(&sched_lock);
   85                 PROC_UNLOCK(p);
   86 #ifdef SMP
   87         }
   88 #endif
   89 }
   90 
   91 /*
   92  * The actual idle process.
   93  */
   94 static void
   95 idle_proc(void *dummy)
   96 {
   97         struct proc *p;
   98         struct thread *td;
   99 #ifdef SMP
  100         cpumask_t mycpu;
  101 #endif
  102 
  103         td = curthread;
  104         p = td->td_proc;
  105 #ifdef SMP
  106         mycpu = PCPU_GET(cpumask);
  107         mtx_lock_spin(&sched_lock);
  108         idle_cpus_mask |= mycpu;
  109         mtx_unlock_spin(&sched_lock);
  110 #endif
  111         for (;;) {
  112                 mtx_assert(&Giant, MA_NOTOWNED);
  113 
  114                 while (sched_runnable() == 0)
  115                         cpu_idle();
  116 
  117                 mtx_lock_spin(&sched_lock);
  118 #ifdef SMP
  119                 idle_cpus_mask &= ~mycpu;
  120 #endif
  121                 mi_switch(SW_VOL, NULL);
  122 #ifdef SMP
  123                 idle_cpus_mask |= mycpu;
  124 #endif
  125                 mtx_unlock_spin(&sched_lock);
  126         }
  127 }

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