vm_meter.c revision 1542
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 */ 35 36#include <sys/param.h> 37#include <sys/proc.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <vm/vm.h> 41#include <sys/sysctl.h> 42 43struct loadavg averunnable; /* load average, of runnable procs */ 44 45int maxslp = MAXSLP; 46int saferss = SAFERSS; 47 48void 49vmmeter() 50{ 51 52 if (time.tv_sec % 5 == 0) 53 loadav(&averunnable); 54 if (proc0.p_slptime > maxslp/2) 55 wakeup((caddr_t)&proc0); 56} 57 58/* 59 * Constants for averages over 1, 5, and 15 minutes 60 * when sampling at 5 second intervals. 61 */ 62fixpt_t cexp[3] = { 63 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 64 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 65 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 66}; 67 68/* 69 * Compute a tenex style load average of a quantity on 70 * 1, 5 and 15 minute intervals. 71 */ 72void 73loadav(avg) 74 register struct loadavg *avg; 75{ 76 register int i, nrun; 77 register struct proc *p; 78 79 for (nrun = 0, p = (struct proc *)allproc; p != NULL; p = p->p_next) { 80 switch (p->p_stat) { 81 case SSLEEP: 82 if (p->p_priority > PZERO || p->p_slptime != 0) 83 continue; 84 /* fall through */ 85 case SRUN: 86 case SIDL: 87 nrun++; 88 } 89 } 90 for (i = 0; i < 3; i++) 91 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 92 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 93} 94 95/* 96 * Attributes associated with virtual memory. 97 */ 98vm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 99 int *name; 100 u_int namelen; 101 void *oldp; 102 size_t *oldlenp; 103 void *newp; 104 size_t newlen; 105 struct proc *p; 106{ 107 struct vmtotal vmtotals; 108 109 /* all sysctl names at this level are terminal */ 110 if (namelen != 1) 111 return (ENOTDIR); /* overloaded */ 112 113 switch (name[0]) { 114 case VM_LOADAVG: 115 averunnable.fscale = FSCALE; 116 return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable, 117 sizeof(averunnable))); 118 case VM_METER: 119 vmtotal(&vmtotals); 120 return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals, 121 sizeof(vmtotals))); 122 default: 123 return (EOPNOTSUPP); 124 } 125 /* NOTREACHED */ 126} 127 128/* 129 * Calculate the current state of the system. 130 * Done on demand from getkerninfo(). 131 */ 132void 133vmtotal(totalp) 134 register struct vmtotal *totalp; 135{ 136 register struct proc *p; 137 register vm_map_entry_t entry; 138 register vm_object_t object; 139 register vm_map_t map; 140 int paging; 141 142 bzero(totalp, sizeof *totalp); 143 /* 144 * Mark all objects as inactive. 145 */ 146 simple_lock(&vm_object_list_lock); 147 for (object = vm_object_list.tqh_first; 148 object != NULL; 149 object = object->object_list.tqe_next) 150 object->flags &= ~OBJ_ACTIVE; 151 simple_unlock(&vm_object_list_lock); 152 /* 153 * Calculate process statistics. 154 */ 155 for (p = (struct proc *)allproc; p != NULL; p = p->p_next) { 156 if (p->p_flag & P_SYSTEM) 157 continue; 158 switch (p->p_stat) { 159 case 0: 160 continue; 161 162 case SSLEEP: 163 case SSTOP: 164 if (p->p_flag & P_INMEM) { 165 if (p->p_priority <= PZERO) 166 totalp->t_dw++; 167 else if (p->p_slptime < maxslp) 168 totalp->t_sl++; 169 } else if (p->p_slptime < maxslp) 170 totalp->t_sw++; 171 if (p->p_slptime >= maxslp) 172 continue; 173 break; 174 175 case SRUN: 176 case SIDL: 177 if (p->p_flag & P_INMEM) 178 totalp->t_rq++; 179 else 180 totalp->t_sw++; 181 if (p->p_stat == SIDL) 182 continue; 183 break; 184 } 185 /* 186 * Note active objects. 187 */ 188 paging = 0; 189 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 190 entry != &map->header; entry = entry->next) { 191 if (entry->is_a_map || entry->is_sub_map || 192 entry->object.vm_object == NULL) 193 continue; 194 entry->object.vm_object->flags |= OBJ_ACTIVE; 195 paging |= entry->object.vm_object->paging_in_progress; 196 } 197 if (paging) 198 totalp->t_pw++; 199 } 200 /* 201 * Calculate object memory usage statistics. 202 */ 203 simple_lock(&vm_object_list_lock); 204 for (object = vm_object_list.tqh_first; 205 object != NULL; 206 object = object->object_list.tqe_next) { 207 totalp->t_vm += num_pages(object->size); 208 totalp->t_rm += object->resident_page_count; 209 if (object->flags & OBJ_ACTIVE) { 210 totalp->t_avm += num_pages(object->size); 211 totalp->t_arm += object->resident_page_count; 212 } 213 if (object->ref_count > 1) { 214 /* shared object */ 215 totalp->t_vmshr += num_pages(object->size); 216 totalp->t_rmshr += object->resident_page_count; 217 if (object->flags & OBJ_ACTIVE) { 218 totalp->t_avmshr += num_pages(object->size); 219 totalp->t_armshr += object->resident_page_count; 220 } 221 } 222 } 223 totalp->t_free = cnt.v_free_count; 224} 225