kern_idle.c

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    1 /*      $NetBSD: kern_idle.c,v 1.21 2008/06/11 13:42:02 ad 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 1.21 2008/06/11 13:42:02 ad 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>
   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         int s;
   52 
   53         ci->ci_data.cpu_onproc = l;
   54 
   55         /* Update start time for this thread. */
   56         lwp_lock(l);
   57         binuptime(&l->l_stime);
   58         lwp_unlock(l);
   59 
   60         spc = &ci->ci_schedstate;
   61         s = splsched();
   62         spc->spc_flags |= SPCF_RUNNING;
   63         splx(s);
   64 
   65         KERNEL_UNLOCK_ALL(l, NULL);
   66         l->l_stat = LSONPROC;
   67         for (;;) {
   68                 LOCKDEBUG_BARRIER(NULL, 0);
   69                 KASSERT((l->l_flag & LW_IDLE) != 0);
   70                 KASSERT(ci == curcpu());
   71                 KASSERT(l == curlwp);
   72                 KASSERT(CURCPU_IDLE_P());
   73                 KASSERT(l->l_priority == PRI_IDLE);
   74 
   75                 sched_idle();
   76                 if (!sched_curcpu_runnable_p()) {
   77                         if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
   78                                 uvm_pageidlezero();
   79                         }
   80                         if (!sched_curcpu_runnable_p()) {
   81                                 cpu_idle();
   82                                 if (!sched_curcpu_runnable_p() &&
   83                                     !ci->ci_want_resched) {
   84                                         continue;
   85                                 }
   86                         }
   87                 }
   88                 KASSERT(l->l_mutex == l->l_cpu->ci_schedstate.spc_lwplock);
   89                 lwp_lock(l);
   90                 mi_switch(l);
   91                 KASSERT(curlwp == l);
   92                 KASSERT(l->l_stat == LSONPROC);
   93         }
   94 }
   95 
   96 int
   97 create_idle_lwp(struct cpu_info *ci)
   98 {
   99         lwp_t *l;
  100         int error;
  101 
  102         KASSERT(ci->ci_data.cpu_idlelwp == NULL);
  103         error = kthread_create(PRI_IDLE, KTHREAD_MPSAFE | KTHREAD_IDLE,
  104             ci, idle_loop, NULL, &l, "idle/%u", ci->ci_index);
  105         if (error != 0)
  106                 panic("create_idle_lwp: error %d", error);
  107         lwp_lock(l);
  108         l->l_flag |= LW_IDLE;
  109         lwp_unlock(l);
  110         l->l_cpu = ci;
  111         ci->ci_data.cpu_idlelwp = l;
  112 
  113         return error;
  114 }

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

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