vm_meter.c revision 12623
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 1.9 1995/11/14 09:29:34 phk 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 = 45 { {0, 0, 0}, FSCALE }; /* load average, of runnable procs */ 46 47struct vmmeter cnt; 48 49int maxslp = MAXSLP; 50 51/* 52 * Constants for averages over 1, 5, and 15 minutes 53 * when sampling at 5 second intervals. 54 */ 55fixpt_t cexp[3] = { 56 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 57 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 58 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 59}; 60 61/* 62 * Compute a tenex style load average of a quantity on 63 * 1, 5 and 15 minute intervals. 64 */ 65static void 66loadav(struct loadavg *avg) 67{ 68 register int i, nrun; 69 register struct proc *p; 70 71 for (nrun = 0, p = (struct proc *) allproc; p != NULL; p = p->p_next) { 72 switch (p->p_stat) { 73 case SSLEEP: 74 if (p->p_priority > PZERO || p->p_slptime != 0) 75 continue; 76 /* fall through */ 77 case SRUN: 78 case SIDL: 79 nrun++; 80 } 81 } 82 for (i = 0; i < 3; i++) 83 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 84 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 85} 86 87void 88vmmeter() 89{ 90 91 if (time.tv_sec % 5 == 0) 92 loadav(&averunnable); 93 if (proc0.p_slptime > maxslp / 2) 94 wakeup(&proc0); 95} 96 97SYSCTL_INT(_vm, VM_V_FREE_MIN, v_free_min, 98 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 99SYSCTL_INT(_vm, VM_V_FREE_TARGET, v_free_target, 100 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 101SYSCTL_INT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 102 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 103SYSCTL_INT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 104 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 105SYSCTL_INT(_vm, VM_V_CACHE_MIN, v_cache_min, 106 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 107SYSCTL_INT(_vm, VM_V_CACHE_MAX, v_cache_max, 108 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 109SYSCTL_INT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 110 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 111 112SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD, &averunnable, loadavg, ""); 113 114static int 115vmtotal SYSCTL_HANDLER_ARGS 116{ 117 struct proc *p; 118 struct vmtotal total, *totalp; 119 vm_map_entry_t entry; 120 vm_object_t object; 121 vm_map_t map; 122 int paging; 123 124 totalp = &total; 125 bzero(totalp, sizeof *totalp); 126 /* 127 * Mark all objects as inactive. 128 */ 129 for (object = vm_object_list.tqh_first; 130 object != NULL; 131 object = object->object_list.tqe_next) 132 object->flags &= ~OBJ_ACTIVE; 133 /* 134 * Calculate process statistics. 135 */ 136 for (p = (struct proc *) allproc; p != NULL; p = p->p_next) { 137 if (p->p_flag & P_SYSTEM) 138 continue; 139 switch (p->p_stat) { 140 case 0: 141 continue; 142 143 case SSLEEP: 144 case SSTOP: 145 if (p->p_flag & P_INMEM) { 146 if (p->p_priority <= PZERO) 147 totalp->t_dw++; 148 else if (p->p_slptime < maxslp) 149 totalp->t_sl++; 150 } else if (p->p_slptime < maxslp) 151 totalp->t_sw++; 152 if (p->p_slptime >= maxslp) 153 continue; 154 break; 155 156 case SRUN: 157 case SIDL: 158 if (p->p_flag & P_INMEM) 159 totalp->t_rq++; 160 else 161 totalp->t_sw++; 162 if (p->p_stat == SIDL) 163 continue; 164 break; 165 } 166 /* 167 * Note active objects. 168 */ 169 paging = 0; 170 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 171 entry != &map->header; entry = entry->next) { 172 if (entry->is_a_map || entry->is_sub_map || 173 entry->object.vm_object == NULL) 174 continue; 175 entry->object.vm_object->flags |= OBJ_ACTIVE; 176 paging |= entry->object.vm_object->paging_in_progress; 177 } 178 if (paging) 179 totalp->t_pw++; 180 } 181 /* 182 * Calculate object memory usage statistics. 183 */ 184 for (object = vm_object_list.tqh_first; 185 object != NULL; 186 object = object->object_list.tqe_next) { 187 totalp->t_vm += num_pages(object->size); 188 totalp->t_rm += object->resident_page_count; 189 if (object->flags & OBJ_ACTIVE) { 190 totalp->t_avm += num_pages(object->size); 191 totalp->t_arm += object->resident_page_count; 192 } 193 if (object->ref_count > 1) { 194 /* shared object */ 195 totalp->t_vmshr += num_pages(object->size); 196 totalp->t_rmshr += object->resident_page_count; 197 if (object->flags & OBJ_ACTIVE) { 198 totalp->t_avmshr += num_pages(object->size); 199 totalp->t_armshr += object->resident_page_count; 200 } 201 } 202 } 203 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 204 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req)); 205} 206 207SYSCTL_PROC(_vm, VM_METER, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD, 208 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", ""); 209