vm_meter.c revision 38517
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 1.25 1998/03/30 09:56:49 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 <sys/resource.h> 42#include <sys/vmmeter.h> 43 44#include <vm/vm.h> 45#include <vm/vm_extern.h> 46#include <vm/vm_param.h> 47#include <sys/lock.h> 48#include <vm/pmap.h> 49#include <vm/vm_map.h> 50#include <vm/vm_object.h> 51#include <sys/sysctl.h> 52 53struct loadavg averunnable = 54 { {0, 0, 0}, FSCALE }; /* load average, of runnable procs */ 55 56struct vmmeter cnt; 57 58static int maxslp = MAXSLP; 59 60/* 61 * Constants for averages over 1, 5, and 15 minutes 62 * when sampling at 5 second intervals. 63 */ 64static fixpt_t cexp[3] = { 65 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 66 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 67 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 68}; 69 70/* 71 * Compute a tenex style load average of a quantity on 72 * 1, 5 and 15 minute intervals. 73 */ 74static void 75loadav(struct loadavg *avg) 76{ 77 register int i, nrun; 78 register struct proc *p; 79 80 for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 81 switch (p->p_stat) { 82 case SSLEEP: 83 if (p->p_priority > PZERO || p->p_slptime != 0) 84 continue; 85 /* fall through */ 86 case SRUN: 87 case SIDL: 88 nrun++; 89 } 90 } 91 for (i = 0; i < 3; i++) 92 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 93 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 94} 95 96void 97vmmeter() 98{ 99 100 if (time_second % 5 == 0) 101 loadav(&averunnable); 102 if (proc0.p_slptime > maxslp / 2) 103 wakeup(&proc0); 104} 105 106SYSCTL_INT(_vm, VM_V_FREE_MIN, v_free_min, 107 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 108SYSCTL_INT(_vm, VM_V_FREE_TARGET, v_free_target, 109 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 110SYSCTL_INT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 111 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 112SYSCTL_INT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 113 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 114SYSCTL_INT(_vm, VM_V_CACHE_MIN, v_cache_min, 115 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 116SYSCTL_INT(_vm, VM_V_CACHE_MAX, v_cache_max, 117 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 118SYSCTL_INT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 119 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 120 121SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD, &averunnable, loadavg, ""); 122 123static int 124vmtotal SYSCTL_HANDLER_ARGS 125{ 126 struct proc *p; 127 struct vmtotal total, *totalp; 128 vm_map_entry_t entry; 129 vm_object_t object; 130 vm_map_t map; 131 int paging; 132 133 totalp = &total; 134 bzero(totalp, sizeof *totalp); 135 /* 136 * Mark all objects as inactive. 137 */ 138 for (object = TAILQ_FIRST(&vm_object_list); 139 object != NULL; 140 object = TAILQ_NEXT(object,object_list)) 141 vm_object_clear_flag(object, OBJ_ACTIVE); 142 /* 143 * Calculate process statistics. 144 */ 145 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 146 if (p->p_flag & P_SYSTEM) 147 continue; 148 switch (p->p_stat) { 149 case 0: 150 continue; 151 152 case SSLEEP: 153 case SSTOP: 154 if (p->p_flag & P_INMEM) { 155 if (p->p_priority <= PZERO) 156 totalp->t_dw++; 157 else if (p->p_slptime < maxslp) 158 totalp->t_sl++; 159 } else if (p->p_slptime < maxslp) 160 totalp->t_sw++; 161 if (p->p_slptime >= maxslp) 162 continue; 163 break; 164 165 case SRUN: 166 case SIDL: 167 if (p->p_flag & P_INMEM) 168 totalp->t_rq++; 169 else 170 totalp->t_sw++; 171 if (p->p_stat == SIDL) 172 continue; 173 break; 174 } 175 /* 176 * Note active objects. 177 */ 178 paging = 0; 179 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 180 entry != &map->header; entry = entry->next) { 181 if ((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) || 182 entry->object.vm_object == NULL) 183 continue; 184 vm_object_set_flag(entry->object.vm_object, OBJ_ACTIVE); 185 paging |= entry->object.vm_object->paging_in_progress; 186 } 187 if (paging) 188 totalp->t_pw++; 189 } 190 /* 191 * Calculate object memory usage statistics. 192 */ 193 for (object = TAILQ_FIRST(&vm_object_list); 194 object != NULL; 195 object = TAILQ_NEXT(object, object_list)) { 196 totalp->t_vm += object->size; 197 totalp->t_rm += object->resident_page_count; 198 if (object->flags & OBJ_ACTIVE) { 199 totalp->t_avm += object->size; 200 totalp->t_arm += object->resident_page_count; 201 } 202 if (object->shadow_count > 1) { 203 /* shared object */ 204 totalp->t_vmshr += object->size; 205 totalp->t_rmshr += object->resident_page_count; 206 if (object->flags & OBJ_ACTIVE) { 207 totalp->t_avmshr += object->size; 208 totalp->t_armshr += object->resident_page_count; 209 } 210 } 211 } 212 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 213 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req)); 214} 215 216SYSCTL_PROC(_vm, VM_METER, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD, 217 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", ""); 218