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 /*      $NetBSD: kern_idle.c,v 1.24 2011/01/17 07:13:31 uebayasi Exp $  */
    2 
    3 /*-
    4  * Copyright (c)2002, 2006, 2007 YAMAMOTO Takashi,
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 
   31 __KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.24 2011/01/17 07:13:31 uebayasi Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/cpu.h>
   35 #include <sys/idle.h>
   36 #include <sys/kthread.h>
   37 #include <sys/lockdebug.h>
   38 #include <sys/kmem.h>
   39 #include <sys/proc.h>
   40 #include <sys/atomic.h>
   41 
   42 #include <uvm/uvm.h>    /* uvm_pageidlezero */
   43 #include <uvm/uvm_extern.h>
   44 
   45 void
   46 idle_loop(void *dummy)
   47 {
   48         struct cpu_info *ci = curcpu();
   49         struct schedstate_percpu *spc;
   50         struct lwp *l = curlwp;
   51 
   52         ci->ci_data.cpu_onproc = l;
   53 
   54         /* Update start time for this thread. */
   55         lwp_lock(l);
   56         binuptime(&l->l_stime);
   57         lwp_unlock(l);
   58 
   59         /*
   60          * Use spl0() here to ensure that we have the correct interrupt
   61          * priority.  This may be the first thread running on the CPU,
   62          * in which case we took a dirtbag route to get here.
   63          */
   64         spc = &ci->ci_schedstate;
   65         (void)splsched();
   66         spc->spc_flags |= SPCF_RUNNING;
   67         spl0();
   68 
   69         KERNEL_UNLOCK_ALL(l, NULL);
   70         l->l_stat = LSONPROC;
   71         l->l_pflag |= LP_RUNNING;
   72         for (;;) {
   73                 LOCKDEBUG_BARRIER(NULL, 0);
   74                 KASSERT((l->l_flag & LW_IDLE) != 0);
   75                 KASSERT(ci == curcpu());
   76                 KASSERT(l == curlwp);
   77                 KASSERT(CURCPU_IDLE_P());
   78                 KASSERT(l->l_priority == PRI_IDLE);
   79 
   80                 sched_idle();
   81                 if (!sched_curcpu_runnable_p()) {
   82                         if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
   83                                 uvm_pageidlezero();
   84                         }
   85                         if (!sched_curcpu_runnable_p()) {
   86                                 cpu_idle();
   87                                 if (!sched_curcpu_runnable_p() &&
   88                                     !ci->ci_want_resched) {
   89                                         continue;
   90                                 }
   91                         }
   92                 }
   93                 KASSERT(l->l_mutex == l->l_cpu->ci_schedstate.spc_lwplock);
   94                 lwp_lock(l);
   95                 mi_switch(l);
   96                 KASSERT(curlwp == l);
   97                 KASSERT(l->l_stat == LSONPROC);
   98         }
   99 }
  100 
  101 int
  102 create_idle_lwp(struct cpu_info *ci)
  103 {
  104         lwp_t *l;
  105         int error;
  106 
  107         KASSERT(ci->ci_data.cpu_idlelwp == NULL);
  108         error = kthread_create(PRI_IDLE, KTHREAD_MPSAFE | KTHREAD_IDLE,
  109             ci, idle_loop, NULL, &l, "idle/%u", ci->ci_index);
  110         if (error != 0)
  111                 panic("create_idle_lwp: error %d", error);
  112         lwp_lock(l);
  113         l->l_flag |= LW_IDLE;
  114         lwp_unlock(l);
  115         l->l_cpu = ci;
  116         ci->ci_data.cpu_idlelwp = l;
  117 
  118         return error;
  119 }

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