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 1.8 1995/07/29 11:44:25 bde 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 44 struct loadavg averunnable; /* load average, of runnable procs */ 45 struct vmmeter cnt; 46 47 int maxslp = MAXSLP; 48 49 /* 50 * Constants for averages over 1, 5, and 15 minutes 51 * when sampling at 5 second intervals. 52 */ 53 fixpt_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 */ 63 static void 64 loadav(struct loadavg *avg) 65 { 66 register int i, nrun; 67 register struct proc *p; 68 69 for (nrun = 0, p = (struct proc *) allproc; p != NULL; p = p->p_next) { 70 switch (p->p_stat) { 71 case SSLEEP: 72 if (p->p_priority > PZERO || p->p_slptime != 0) 73 continue; 74 /* fall through */ 75 case SRUN: 76 case SIDL: 77 nrun++; 78 } 79 } 80 for (i = 0; i < 3; i++) 81 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 82 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 83 } 84 85 void 86 vmmeter() 87 { 88 89 if (time.tv_sec % 5 == 0) 90 loadav(&averunnable); 91 if (proc0.p_slptime > maxslp / 2) 92 wakeup(&proc0); 93 } 94 95 SYSCTL_INT(_vm, VM_V_FREE_MIN, v_free_min, 96 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 97 SYSCTL_INT(_vm, VM_V_FREE_TARGET, v_free_target, 98 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 99 SYSCTL_INT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 100 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 101 SYSCTL_INT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 102 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 103 SYSCTL_INT(_vm, VM_V_CACHE_MIN, v_cache_min, 104 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 105 SYSCTL_INT(_vm, VM_V_CACHE_MAX, v_cache_max, 106 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 107 SYSCTL_INT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 108 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 109 110 static int 111 vm_loadavg SYSCTL_HANDLER_ARGS 112 { 113 averunnable.fscale = FSCALE; 114 return (sysctl_handle_opaque(oidp, 115 oidp->oid_arg1, oidp->oid_arg2, req)); 116 } 117 118 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_OPAQUE|CTLFLAG_RD, 119 &averunnable, sizeof(averunnable), vm_loadavg, ""); 120 121 static int 122 vmtotal SYSCTL_HANDLER_ARGS 123 { 124 struct proc *p; 125 struct vmtotal total, *totalp; 126 vm_map_entry_t entry; 127 vm_object_t object; 128 vm_map_t map; 129 int paging; 130 131 totalp = &total; 132 bzero(totalp, sizeof *totalp); 133 /* 134 * Mark all objects as inactive. 135 */ 136 for (object = vm_object_list.tqh_first; 137 object != NULL; 138 object = object->object_list.tqe_next) 139 object->flags &= ~OBJ_ACTIVE; 140 /* 141 * Calculate process statistics. 142 */ 143 for (p = (struct proc *) allproc; p != NULL; p = p->p_next) { 144 if (p->p_flag & P_SYSTEM) 145 continue; 146 switch (p->p_stat) { 147 case 0: 148 continue; 149 150 case SSLEEP: 151 case SSTOP: 152 if (p->p_flag & P_INMEM) { 153 if (p->p_priority <= PZERO) 154 totalp->t_dw++; 155 else if (p->p_slptime < maxslp) 156 totalp->t_sl++; 157 } else if (p->p_slptime < maxslp) 158 totalp->t_sw++; 159 if (p->p_slptime >= maxslp) 160 continue; 161 break; 162 163 case SRUN: 164 case SIDL: 165 if (p->p_flag & P_INMEM) 166 totalp->t_rq++; 167 else 168 totalp->t_sw++; 169 if (p->p_stat == SIDL) 170 continue; 171 break; 172 } 173 /* 174 * Note active objects. 175 */ 176 paging = 0; 177 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 178 entry != &map->header; entry = entry->next) { 179 if (entry->is_a_map || entry->is_sub_map || 180 entry->object.vm_object == NULL) 181 continue; 182 entry->object.vm_object->flags |= OBJ_ACTIVE; 183 paging |= entry->object.vm_object->paging_in_progress; 184 } 185 if (paging) 186 totalp->t_pw++; 187 } 188 /* 189 * Calculate object memory usage statistics. 190 */ 191 for (object = vm_object_list.tqh_first; 192 object != NULL; 193 object = object->object_list.tqe_next) { 194 totalp->t_vm += num_pages(object->size); 195 totalp->t_rm += object->resident_page_count; 196 if (object->flags & OBJ_ACTIVE) { 197 totalp->t_avm += num_pages(object->size); 198 totalp->t_arm += object->resident_page_count; 199 } 200 if (object->ref_count > 1) { 201 /* shared object */ 202 totalp->t_vmshr += num_pages(object->size); 203 totalp->t_rmshr += object->resident_page_count; 204 if (object->flags & OBJ_ACTIVE) { 205 totalp->t_avmshr += num_pages(object->size); 206 totalp->t_armshr += object->resident_page_count; 207 } 208 } 209 } 210 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 211 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req)); 212 } 213 214 SYSCTL_PROC(_vm, VM_METER, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD, 215 0, sizeof(struct vmtotal), vmtotal, ""); 216