kern_idle.c revision 1.4.10.2
1 1.4.10.2 yamt /* $NetBSD: kern_idle.c,v 1.4.10.2 2007/10/14 11:48:39 yamt Exp $ */ 2 1.2 yamt 3 1.2 yamt /*- 4 1.2 yamt * Copyright (c)2002, 2006, 2007 YAMAMOTO Takashi, 5 1.2 yamt * All rights reserved. 6 1.2 yamt * 7 1.2 yamt * Redistribution and use in source and binary forms, with or without 8 1.2 yamt * modification, are permitted provided that the following conditions 9 1.2 yamt * are met: 10 1.2 yamt * 1. Redistributions of source code must retain the above copyright 11 1.2 yamt * notice, this list of conditions and the following disclaimer. 12 1.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 13 1.2 yamt * notice, this list of conditions and the following disclaimer in the 14 1.2 yamt * documentation and/or other materials provided with the distribution. 15 1.2 yamt * 16 1.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.2 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.2 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.2 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.2 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2 yamt * SUCH DAMAGE. 27 1.2 yamt */ 28 1.2 yamt 29 1.2 yamt #include <sys/cdefs.h> 30 1.2 yamt 31 1.4.10.2 yamt __KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.4.10.2 2007/10/14 11:48:39 yamt Exp $"); 32 1.2 yamt 33 1.2 yamt #include <sys/param.h> 34 1.2 yamt #include <sys/cpu.h> 35 1.2 yamt #include <sys/idle.h> 36 1.2 yamt #include <sys/lwp.h> 37 1.2 yamt #include <sys/lockdebug.h> 38 1.2 yamt #include <sys/kmem.h> 39 1.4 ad #include <sys/proc.h> 40 1.2 yamt 41 1.2 yamt #include <uvm/uvm.h> 42 1.2 yamt #include <uvm/uvm_extern.h> 43 1.2 yamt 44 1.2 yamt #define PIDLELWP (MAXPRI + 1) /* lowest priority */ 45 1.2 yamt 46 1.2 yamt void 47 1.2 yamt idle_loop(void *dummy) 48 1.2 yamt { 49 1.2 yamt struct cpu_info *ci = curcpu(); 50 1.2 yamt struct lwp *l = curlwp; 51 1.2 yamt 52 1.4.10.2 yamt /* Update start time for this thread. */ 53 1.4.10.2 yamt microtime(&l->l_stime); 54 1.4.10.2 yamt 55 1.2 yamt KERNEL_UNLOCK_ALL(l, NULL); 56 1.2 yamt l->l_usrpri = PIDLELWP; 57 1.3 ad l->l_priority = l->l_usrpri; 58 1.2 yamt l->l_stat = LSONPROC; 59 1.2 yamt while (1 /* CONSTCOND */) { 60 1.2 yamt KERNEL_LOCK_ASSERT_UNLOCKED(); 61 1.2 yamt LOCKDEBUG_BARRIER(NULL, 0); 62 1.2 yamt KASSERT((l->l_flag & LW_IDLE) != 0); 63 1.2 yamt KASSERT(ci == curcpu()); 64 1.2 yamt KASSERT(l == curlwp); 65 1.2 yamt KASSERT(CURCPU_IDLE_P()); 66 1.2 yamt KASSERT(l->l_usrpri == PIDLELWP); 67 1.2 yamt 68 1.2 yamt if (uvm.page_idle_zero) { 69 1.2 yamt if (sched_curcpu_runnable_p()) { 70 1.2 yamt goto schedule; 71 1.2 yamt } 72 1.2 yamt uvm_pageidlezero(); 73 1.2 yamt } 74 1.2 yamt if (!sched_curcpu_runnable_p()) { 75 1.2 yamt cpu_idle(); 76 1.4.10.1 yamt if (!sched_curcpu_runnable_p() && 77 1.4.10.1 yamt !ci->ci_want_resched) { 78 1.2 yamt continue; 79 1.2 yamt } 80 1.2 yamt } 81 1.2 yamt schedule: 82 1.2 yamt KASSERT(l->l_mutex == &l->l_cpu->ci_schedstate.spc_lwplock); 83 1.2 yamt lwp_lock(l); 84 1.2 yamt mi_switch(l); 85 1.2 yamt KASSERT(curlwp == l); 86 1.2 yamt KASSERT(l->l_stat == LSONPROC); 87 1.2 yamt } 88 1.2 yamt } 89 1.2 yamt 90 1.2 yamt int 91 1.2 yamt create_idle_lwp(struct cpu_info *ci) 92 1.2 yamt { 93 1.2 yamt struct proc *p = &proc0; 94 1.2 yamt struct lwp *l; 95 1.2 yamt char *name; 96 1.2 yamt vaddr_t uaddr; 97 1.2 yamt bool inmem; 98 1.2 yamt cpuid_t cpuid; 99 1.2 yamt int error; 100 1.2 yamt 101 1.2 yamt KASSERT(ci->ci_data.cpu_idlelwp == NULL); 102 1.2 yamt inmem = uvm_uarea_alloc(&uaddr); 103 1.2 yamt if (uaddr == 0) { 104 1.2 yamt return ENOMEM; 105 1.2 yamt } 106 1.2 yamt error = newlwp(&lwp0, p, uaddr, inmem, 0, NULL, 0, idle_loop, NULL, &l); 107 1.2 yamt if (error != 0) { 108 1.2 yamt panic("create_idle_lwp: newlwp failed"); 109 1.2 yamt } 110 1.3 ad uvm_lwp_hold(l); 111 1.2 yamt l->l_flag |= (LW_IDLE | LW_BOUND); 112 1.2 yamt l->l_cpu = ci; 113 1.2 yamt l->l_mutex = &ci->ci_schedstate.spc_lwplock; 114 1.2 yamt ci->ci_data.cpu_idlelwp = l; 115 1.2 yamt name = kmem_alloc(MAXCOMLEN, KM_NOSLEEP); 116 1.2 yamt if (name != NULL) { 117 1.2 yamt #ifdef MULTIPROCESSOR /* XXX should be mandatory */ 118 1.2 yamt cpuid = ci->ci_cpuid; 119 1.2 yamt #else 120 1.2 yamt cpuid = 0; 121 1.2 yamt #endif 122 1.3 ad snprintf(name, MAXCOMLEN, "idle/%d", (int)cpuid); 123 1.2 yamt lwp_lock(l); 124 1.2 yamt l->l_name = name; 125 1.2 yamt lwp_unlock(l); 126 1.2 yamt } 127 1.2 yamt return error; 128 1.2 yamt } 129
Indexes created Tue Sep 30 11:09:46 GMT 2025