vm_meter.c revision 9759
1/* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 34 * $Id: vm_meter.c,v 1.7 1995/07/13 08:48:30 davidg Exp $ 35 */ 36 37#include <sys/param.h> 38#include <sys/proc.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <vm/vm.h> 42#include <sys/sysctl.h> 43 44struct loadavg averunnable; /* load average, of runnable procs */ 45struct vmmeter cnt; 46 47int maxslp = MAXSLP; 48 49/* 50 * Constants for averages over 1, 5, and 15 minutes 51 * when sampling at 5 second intervals. 52 */ 53fixpt_t cexp[3] = { 54 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 55 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 56 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 57}; 58 59/* 60 * Compute a tenex style load average of a quantity on 61 * 1, 5 and 15 minute intervals. 62 */ 63static void 64loadav(avg) 65 register struct loadavg *avg; 66{ 67 register int i, nrun; 68 register struct proc *p; 69 70 for (nrun = 0, p = (struct proc *) allproc; p != NULL; p = p->p_next) { 71 switch (p->p_stat) { 72 case SSLEEP: 73 if (p->p_priority > PZERO || p->p_slptime != 0) 74 continue; 75 /* fall through */ 76 case SRUN: 77 case SIDL: 78 nrun++; 79 } 80 } 81 for (i = 0; i < 3; i++) 82 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 83 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 84} 85 86void 87vmmeter() 88{ 89 90 if (time.tv_sec % 5 == 0) 91 loadav(&averunnable); 92 if (proc0.p_slptime > maxslp / 2) 93 wakeup(&proc0); 94} 95 96/* 97 * Attributes associated with virtual memory. 98 */ 99int 100vm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 101 int *name; 102 u_int namelen; 103 void *oldp; 104 size_t *oldlenp; 105 void *newp; 106 size_t newlen; 107 struct proc *p; 108{ 109 struct vmtotal vmtotals; 110 111 /* all sysctl names at this level are terminal */ 112 if (namelen != 1) 113 return (ENOTDIR); /* overloaded */ 114 115 switch (name[0]) { 116 case VM_LOADAVG: 117 averunnable.fscale = FSCALE; 118 return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable, 119 sizeof(averunnable))); 120 case VM_METER: 121 vmtotal(&vmtotals); 122 return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals, 123 sizeof(vmtotals))); 124 case VM_V_FREE_MIN: 125 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_min)); 126 case VM_V_FREE_TARGET: 127 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_target)); 128 case VM_V_FREE_RESERVED: 129 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_free_reserved)); 130 case VM_V_INACTIVE_TARGET: 131 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_inactive_target)); 132 case VM_V_CACHE_MIN: 133 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_cache_min)); 134 case VM_V_CACHE_MAX: 135 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_cache_max)); 136 case VM_V_PAGEOUT_FREE_MIN: 137 return (sysctl_int(oldp, oldlenp, newp, newlen, &cnt.v_pageout_free_min)); 138 139 default: 140 return (EOPNOTSUPP); 141 } 142 /* NOTREACHED */ 143} 144 145/* 146 * Calculate the current state of the system. 147 * Done on demand from getkerninfo(). 148 */ 149void 150vmtotal(totalp) 151 register struct vmtotal *totalp; 152{ 153 register struct proc *p; 154 register vm_map_entry_t entry; 155 register vm_object_t object; 156 register vm_map_t map; 157 int paging; 158 159 bzero(totalp, sizeof *totalp); 160 /* 161 * Mark all objects as inactive. 162 */ 163 for (object = vm_object_list.tqh_first; 164 object != NULL; 165 object = object->object_list.tqe_next) 166 object->flags &= ~OBJ_ACTIVE; 167 /* 168 * Calculate process statistics. 169 */ 170 for (p = (struct proc *) allproc; p != NULL; p = p->p_next) { 171 if (p->p_flag & P_SYSTEM) 172 continue; 173 switch (p->p_stat) { 174 case 0: 175 continue; 176 177 case SSLEEP: 178 case SSTOP: 179 if (p->p_flag & P_INMEM) { 180 if (p->p_priority <= PZERO) 181 totalp->t_dw++; 182 else if (p->p_slptime < maxslp) 183 totalp->t_sl++; 184 } else if (p->p_slptime < maxslp) 185 totalp->t_sw++; 186 if (p->p_slptime >= maxslp) 187 continue; 188 break; 189 190 case SRUN: 191 case SIDL: 192 if (p->p_flag & P_INMEM) 193 totalp->t_rq++; 194 else 195 totalp->t_sw++; 196 if (p->p_stat == SIDL) 197 continue; 198 break; 199 } 200 /* 201 * Note active objects. 202 */ 203 paging = 0; 204 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 205 entry != &map->header; entry = entry->next) { 206 if (entry->is_a_map || entry->is_sub_map || 207 entry->object.vm_object == NULL) 208 continue; 209 entry->object.vm_object->flags |= OBJ_ACTIVE; 210 paging |= entry->object.vm_object->paging_in_progress; 211 } 212 if (paging) 213 totalp->t_pw++; 214 } 215 /* 216 * Calculate object memory usage statistics. 217 */ 218 for (object = vm_object_list.tqh_first; 219 object != NULL; 220 object = object->object_list.tqe_next) { 221 totalp->t_vm += num_pages(object->size); 222 totalp->t_rm += object->resident_page_count; 223 if (object->flags & OBJ_ACTIVE) { 224 totalp->t_avm += num_pages(object->size); 225 totalp->t_arm += object->resident_page_count; 226 } 227 if (object->ref_count > 1) { 228 /* shared object */ 229 totalp->t_vmshr += num_pages(object->size); 230 totalp->t_rmshr += object->resident_page_count; 231 if (object->flags & OBJ_ACTIVE) { 232 totalp->t_avmshr += num_pages(object->size); 233 totalp->t_armshr += object->resident_page_count; 234 } 235 } 236 } 237 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 238} 239