Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_meter.c
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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 * $FreeBSD$ 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_prot.h> 46 #include <vm/vm_page.h> 47 #include <vm/vm_extern.h> 48 #include <vm/vm_param.h> 49 #include <sys/lock.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_object.h> 53 #include <sys/sysctl.h> 54 55 struct loadavg averunnable = 56 { {0, 0, 0}, FSCALE }; /* load average, of runnable procs */ 57 58 struct vmmeter cnt; 59 60 static int maxslp = MAXSLP; 61 62 /* 63 * Constants for averages over 1, 5, and 15 minutes 64 * when sampling at 5 second intervals. 65 */ 66 static fixpt_t cexp[3] = { 67 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 68 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 69 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 70 }; 71 72 /* 73 * Compute a tenex style load average of a quantity on 74 * 1, 5 and 15 minute intervals. 75 */ 76 static void 77 loadav(struct loadavg *avg) 78 { 79 register int i, nrun; 80 register struct proc *p; 81 82 for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 83 switch (p->p_stat) { 84 case SSLEEP: 85 if (p->p_priority > PZERO || p->p_slptime != 0) 86 continue; 87 /* fall through */ 88 case SRUN: 89 case SIDL: 90 nrun++; 91 } 92 } 93 for (i = 0; i < 3; i++) 94 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 95 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 96 } 97 98 void 99 vmmeter() 100 { 101 102 if (time_second % 5 == 0) 103 loadav(&averunnable); 104 if (proc0.p_slptime > maxslp / 2) 105 wakeup(&proc0); 106 } 107 108 SYSCTL_INT(_vm, VM_V_FREE_MIN, v_free_min, 109 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 110 SYSCTL_INT(_vm, VM_V_FREE_TARGET, v_free_target, 111 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 112 SYSCTL_INT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 113 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 114 SYSCTL_INT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 115 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 116 SYSCTL_INT(_vm, VM_V_CACHE_MIN, v_cache_min, 117 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 118 SYSCTL_INT(_vm, VM_V_CACHE_MAX, v_cache_max, 119 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 120 SYSCTL_INT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 121 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 122 123 SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD, &averunnable, loadavg, ""); 124 125 static int 126 vmtotal SYSCTL_HANDLER_ARGS 127 { 128 struct proc *p; 129 struct vmtotal total, *totalp; 130 vm_map_entry_t entry; 131 vm_object_t object; 132 vm_map_t map; 133 int paging; 134 135 totalp = &total; 136 bzero(totalp, sizeof *totalp); 137 /* 138 * Mark all objects as inactive. 139 */ 140 for (object = TAILQ_FIRST(&vm_object_list); 141 object != NULL; 142 object = TAILQ_NEXT(object,object_list)) 143 vm_object_clear_flag(object, OBJ_ACTIVE); 144 /* 145 * Calculate process statistics. 146 */ 147 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 148 if (p->p_flag & P_SYSTEM) 149 continue; 150 switch (p->p_stat) { 151 case 0: 152 continue; 153 154 case SSLEEP: 155 case SSTOP: 156 if (p->p_flag & P_INMEM) { 157 if (p->p_priority <= PZERO) 158 totalp->t_dw++; 159 else if (p->p_slptime < maxslp) 160 totalp->t_sl++; 161 } else if (p->p_slptime < maxslp) 162 totalp->t_sw++; 163 if (p->p_slptime >= maxslp) 164 continue; 165 break; 166 167 case SRUN: 168 case SIDL: 169 if (p->p_flag & P_INMEM) 170 totalp->t_rq++; 171 else 172 totalp->t_sw++; 173 if (p->p_stat == SIDL) 174 continue; 175 break; 176 } 177 /* 178 * Note active objects. 179 */ 180 paging = 0; 181 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 182 entry != &map->header; entry = entry->next) { 183 if ((entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) || 184 entry->object.vm_object == NULL) 185 continue; 186 vm_object_set_flag(entry->object.vm_object, OBJ_ACTIVE); 187 paging |= entry->object.vm_object->paging_in_progress; 188 } 189 if (paging) 190 totalp->t_pw++; 191 } 192 /* 193 * Calculate object memory usage statistics. 194 */ 195 for (object = TAILQ_FIRST(&vm_object_list); 196 object != NULL; 197 object = TAILQ_NEXT(object, object_list)) { 198 totalp->t_vm += object->size; 199 totalp->t_rm += object->resident_page_count; 200 if (object->flags & OBJ_ACTIVE) { 201 totalp->t_avm += object->size; 202 totalp->t_arm += object->resident_page_count; 203 } 204 if (object->shadow_count > 1) { 205 /* shared object */ 206 totalp->t_vmshr += object->size; 207 totalp->t_rmshr += object->resident_page_count; 208 if (object->flags & OBJ_ACTIVE) { 209 totalp->t_avmshr += object->size; 210 totalp->t_armshr += object->resident_page_count; 211 } 212 } 213 } 214 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 215 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req)); 216 } 217 218 SYSCTL_PROC(_vm, VM_METER, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD, 219 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", ""); 220 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 221 SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats"); 222 SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats"); 223 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 224 SYSCTL_INT(_vm_stats_sys, OID_AUTO, 225 v_swtch, CTLFLAG_RD, &cnt.v_swtch, 0, "Context switches"); 226 SYSCTL_INT(_vm_stats_sys, OID_AUTO, 227 v_trap, CTLFLAG_RD, &cnt.v_trap, 0, "Traps"); 228 SYSCTL_INT(_vm_stats_sys, OID_AUTO, 229 v_syscall, CTLFLAG_RD, &cnt.v_syscall, 0, "Syscalls"); 230 SYSCTL_INT(_vm_stats_sys, OID_AUTO, 231 v_intr, CTLFLAG_RD, &cnt.v_intr, 0, "HW intr"); 232 SYSCTL_INT(_vm_stats_sys, OID_AUTO, 233 v_soft, CTLFLAG_RD, &cnt.v_soft, 0, "SW intr"); 234 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 235 v_vm_faults, CTLFLAG_RD, &cnt.v_vm_faults, 0, "VM faults"); 236 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 237 v_cow_faults, CTLFLAG_RD, &cnt.v_cow_faults, 0, "COW faults"); 238 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 239 v_cow_optim, CTLFLAG_RD, &cnt.v_cow_optim, 0, "Optimized COW faults"); 240 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 241 v_zfod, CTLFLAG_RD, &cnt.v_zfod, 0, "Zero fill"); 242 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 243 v_ozfod, CTLFLAG_RD, &cnt.v_ozfod, 0, "Optimized zero fill"); 244 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 245 v_swapin, CTLFLAG_RD, &cnt.v_swapin, 0, "Swapin operations"); 246 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 247 v_swapout, CTLFLAG_RD, &cnt.v_swapout, 0, "Swapout operations"); 248 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 249 v_swappgsin, CTLFLAG_RD, &cnt.v_swappgsin, 0, "Swapin pages"); 250 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 251 v_swappgsout, CTLFLAG_RD, &cnt.v_swappgsout, 0, "Swapout pages"); 252 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 253 v_vnodein, CTLFLAG_RD, &cnt.v_vnodein, 0, "Vnodein operations"); 254 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 255 v_vnodeout, CTLFLAG_RD, &cnt.v_vnodeout, 0, "Vnodeout operations"); 256 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 257 v_vnodepgsin, CTLFLAG_RD, &cnt.v_vnodepgsin, 0, "Vnodein pages"); 258 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 259 v_vnodepgsout, CTLFLAG_RD, &cnt.v_vnodepgsout, 0, "Vnodeout pages"); 260 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 261 v_intrans, CTLFLAG_RD, &cnt.v_intrans, 0, "In transit page blocking"); 262 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 263 v_reactivated, CTLFLAG_RD, &cnt.v_reactivated, 0, "Reactivated pages"); 264 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 265 v_pdwakeups, CTLFLAG_RD, &cnt.v_pdwakeups, 0, "Pagedaemon wakeups"); 266 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 267 v_pdpages, CTLFLAG_RD, &cnt.v_pdpages, 0, "Pagedaemon page scans"); 268 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 269 v_dfree, CTLFLAG_RD, &cnt.v_dfree, 0, ""); 270 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 271 v_pfree, CTLFLAG_RD, &cnt.v_pfree, 0, ""); 272 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 273 v_tfree, CTLFLAG_RD, &cnt.v_tfree, 0, ""); 274 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 275 v_page_size, CTLFLAG_RD, &cnt.v_page_size, 0, ""); 276 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 277 v_page_count, CTLFLAG_RD, &cnt.v_page_count, 0, ""); 278 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 279 v_free_reserved, CTLFLAG_RD, &cnt.v_free_reserved, 0, ""); 280 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 281 v_free_target, CTLFLAG_RD, &cnt.v_free_target, 0, ""); 282 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 283 v_free_min, CTLFLAG_RD, &cnt.v_free_min, 0, ""); 284 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 285 v_free_count, CTLFLAG_RD, &cnt.v_free_count, 0, ""); 286 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 287 v_wire_count, CTLFLAG_RD, &cnt.v_wire_count, 0, ""); 288 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 289 v_active_count, CTLFLAG_RD, &cnt.v_active_count, 0, ""); 290 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 291 v_inactive_target, CTLFLAG_RD, &cnt.v_inactive_target, 0, ""); 292 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 293 v_inactive_count, CTLFLAG_RD, &cnt.v_inactive_count, 0, ""); 294 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 295 v_cache_count, CTLFLAG_RD, &cnt.v_cache_count, 0, ""); 296 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 297 v_cache_min, CTLFLAG_RD, &cnt.v_cache_min, 0, ""); 298 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 299 v_cache_max, CTLFLAG_RD, &cnt.v_cache_max, 0, ""); 300 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 301 v_pageout_free_min, CTLFLAG_RD, &cnt.v_pageout_free_min, 0, ""); 302 SYSCTL_INT(_vm_stats_vm, OID_AUTO, 303 v_interrupt_free_min, CTLFLAG_RD, &cnt.v_interrupt_free_min, 0, ""); 304 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 305 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, ""); 306 #if 0 307 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 308 page_mask, CTLFLAG_RD, &page_mask, 0, ""); 309 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 310 page_shift, CTLFLAG_RD, &page_shift, 0, ""); 311 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 312 first_page, CTLFLAG_RD, &first_page, 0, ""); 313 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 314 last_page, CTLFLAG_RD, &last_page, 0, ""); 315 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 316 vm_page_bucket_count, CTLFLAG_RD, &vm_page_bucket_count, 0, ""); 317 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 318 vm_page_hash_mask, CTLFLAG_RD, &vm_page_hash_mask, 0, ""); 319 #endif
Cache object: 42dc6ba88e8934ab16c35b14ec49a03c
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