kern_idle.c revision 1.3.2.2
1 1.3.2.2 mjf /* $NetBSD: kern_idle.c,v 1.3.2.2 2007/07/11 20:09:48 mjf Exp $ */ 2 1.3.2.2 mjf 3 1.3.2.2 mjf /*- 4 1.3.2.2 mjf * Copyright (c)2002, 2006, 2007 YAMAMOTO Takashi, 5 1.3.2.2 mjf * All rights reserved. 6 1.3.2.2 mjf * 7 1.3.2.2 mjf * Redistribution and use in source and binary forms, with or without 8 1.3.2.2 mjf * modification, are permitted provided that the following conditions 9 1.3.2.2 mjf * are met: 10 1.3.2.2 mjf * 1. Redistributions of source code must retain the above copyright 11 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer. 12 1.3.2.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 13 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer in the 14 1.3.2.2 mjf * documentation and/or other materials provided with the distribution. 15 1.3.2.2 mjf * 16 1.3.2.2 mjf * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.3.2.2 mjf * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.3.2.2 mjf * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.3.2.2 mjf * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.3.2.2 mjf * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.3.2.2 mjf * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.3.2.2 mjf * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.3.2.2 mjf * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.3.2.2 mjf * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.3.2.2 mjf * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.3.2.2 mjf * SUCH DAMAGE. 27 1.3.2.2 mjf */ 28 1.3.2.2 mjf 29 1.3.2.2 mjf #include <sys/cdefs.h> 30 1.3.2.2 mjf 31 1.3.2.2 mjf __KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.3.2.2 2007/07/11 20:09:48 mjf Exp $"); 32 1.3.2.2 mjf 33 1.3.2.2 mjf #include <sys/param.h> 34 1.3.2.2 mjf #include <sys/cpu.h> 35 1.3.2.2 mjf #include <sys/idle.h> 36 1.3.2.2 mjf #include <sys/lwp.h> 37 1.3.2.2 mjf #include <sys/lockdebug.h> 38 1.3.2.2 mjf #include <sys/kmem.h> 39 1.3.2.2 mjf 40 1.3.2.2 mjf #include <uvm/uvm.h> 41 1.3.2.2 mjf #include <uvm/uvm_extern.h> 42 1.3.2.2 mjf 43 1.3.2.2 mjf #define PIDLELWP (MAXPRI + 1) /* lowest priority */ 44 1.3.2.2 mjf 45 1.3.2.2 mjf void 46 1.3.2.2 mjf idle_loop(void *dummy) 47 1.3.2.2 mjf { 48 1.3.2.2 mjf #if defined(DIAGNOSTIC) 49 1.3.2.2 mjf struct cpu_info *ci = curcpu(); 50 1.3.2.2 mjf #endif /* defined(DIAGNOSTIC) */ 51 1.3.2.2 mjf struct lwp *l = curlwp; 52 1.3.2.2 mjf 53 1.3.2.2 mjf KERNEL_UNLOCK_ALL(l, NULL); 54 1.3.2.2 mjf l->l_usrpri = PIDLELWP; 55 1.3.2.2 mjf l->l_priority = l->l_usrpri; 56 1.3.2.2 mjf l->l_stat = LSONPROC; 57 1.3.2.2 mjf while (1 /* CONSTCOND */) { 58 1.3.2.2 mjf KERNEL_LOCK_ASSERT_UNLOCKED(); 59 1.3.2.2 mjf LOCKDEBUG_BARRIER(NULL, 0); 60 1.3.2.2 mjf KASSERT((l->l_flag & LW_IDLE) != 0); 61 1.3.2.2 mjf KASSERT(ci == curcpu()); 62 1.3.2.2 mjf KASSERT(l == curlwp); 63 1.3.2.2 mjf KASSERT(CURCPU_IDLE_P()); 64 1.3.2.2 mjf KASSERT(l->l_usrpri == PIDLELWP); 65 1.3.2.2 mjf 66 1.3.2.2 mjf if (uvm.page_idle_zero) { 67 1.3.2.2 mjf if (sched_curcpu_runnable_p()) { 68 1.3.2.2 mjf goto schedule; 69 1.3.2.2 mjf } 70 1.3.2.2 mjf uvm_pageidlezero(); 71 1.3.2.2 mjf } 72 1.3.2.2 mjf if (!sched_curcpu_runnable_p()) { 73 1.3.2.2 mjf cpu_idle(); 74 1.3.2.2 mjf if (!sched_curcpu_runnable_p()) { 75 1.3.2.2 mjf continue; 76 1.3.2.2 mjf } 77 1.3.2.2 mjf } 78 1.3.2.2 mjf schedule: 79 1.3.2.2 mjf KASSERT(l->l_mutex == &l->l_cpu->ci_schedstate.spc_lwplock); 80 1.3.2.2 mjf lwp_lock(l); 81 1.3.2.2 mjf mi_switch(l); 82 1.3.2.2 mjf KASSERT(curlwp == l); 83 1.3.2.2 mjf KASSERT(l->l_stat == LSONPROC); 84 1.3.2.2 mjf } 85 1.3.2.2 mjf } 86 1.3.2.2 mjf 87 1.3.2.2 mjf int 88 1.3.2.2 mjf create_idle_lwp(struct cpu_info *ci) 89 1.3.2.2 mjf { 90 1.3.2.2 mjf struct proc *p = &proc0; 91 1.3.2.2 mjf struct lwp *l; 92 1.3.2.2 mjf char *name; 93 1.3.2.2 mjf vaddr_t uaddr; 94 1.3.2.2 mjf bool inmem; 95 1.3.2.2 mjf cpuid_t cpuid; 96 1.3.2.2 mjf int error; 97 1.3.2.2 mjf 98 1.3.2.2 mjf KASSERT(ci->ci_data.cpu_idlelwp == NULL); 99 1.3.2.2 mjf inmem = uvm_uarea_alloc(&uaddr); 100 1.3.2.2 mjf if (uaddr == 0) { 101 1.3.2.2 mjf return ENOMEM; 102 1.3.2.2 mjf } 103 1.3.2.2 mjf error = newlwp(&lwp0, p, uaddr, inmem, 0, NULL, 0, idle_loop, NULL, &l); 104 1.3.2.2 mjf if (error != 0) { 105 1.3.2.2 mjf panic("create_idle_lwp: newlwp failed"); 106 1.3.2.2 mjf } 107 1.3.2.2 mjf uvm_lwp_hold(l); 108 1.3.2.2 mjf l->l_flag |= (LW_IDLE | LW_BOUND); 109 1.3.2.2 mjf l->l_cpu = ci; 110 1.3.2.2 mjf l->l_mutex = &ci->ci_schedstate.spc_lwplock; 111 1.3.2.2 mjf ci->ci_data.cpu_idlelwp = l; 112 1.3.2.2 mjf name = kmem_alloc(MAXCOMLEN, KM_NOSLEEP); 113 1.3.2.2 mjf if (name != NULL) { 114 1.3.2.2 mjf #ifdef MULTIPROCESSOR /* XXX should be mandatory */ 115 1.3.2.2 mjf cpuid = ci->ci_cpuid; 116 1.3.2.2 mjf #else 117 1.3.2.2 mjf cpuid = 0; 118 1.3.2.2 mjf #endif 119 1.3.2.2 mjf snprintf(name, MAXCOMLEN, "idle/%d", (int)cpuid); 120 1.3.2.2 mjf lwp_lock(l); 121 1.3.2.2 mjf l->l_name = name; 122 1.3.2.2 mjf lwp_unlock(l); 123 1.3.2.2 mjf } 124 1.3.2.2 mjf return error; 125 1.3.2.2 mjf } 126
Indexes created Mon Sep 29 21:09:56 GMT 2025