sys/vm/vm_meter.c

   1 /*
   2  * (MPSAFE)
   3  *
   4  * Copyright (c) 1982, 1986, 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)vm_meter.c  8.4 (Berkeley) 1/4/94
  32  * $FreeBSD: src/sys/vm/vm_meter.c,v 1.34.2.7 2002/10/10 19:28:22 dillon Exp $
  33  * $DragonFly: src/sys/vm/vm_meter.c,v 1.15 2008/04/28 18:04:08 dillon Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/proc.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/resource.h>
  41 #include <sys/vmmeter.h>
  42
  43 #include <vm/vm.h>
  44 #include <vm/vm_page.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
  53 struct vmstats vmstats;
  54
  55 static int maxslp = MAXSLP;
  56
  57 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
  58         CTLFLAG_RW, &vmstats.v_free_min, 0,
  59         "Minimum number of pages desired free");
  60 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
  61         CTLFLAG_RW, &vmstats.v_free_target, 0,
  62         "Number of pages desired free");
  63 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
  64         CTLFLAG_RW, &vmstats.v_free_reserved, 0,
  65         "Number of pages reserved for deadlock");
  66 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
  67         CTLFLAG_RW, &vmstats.v_inactive_target, 0,
  68         "Number of pages desired inactive");
  69 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
  70         CTLFLAG_RW, &vmstats.v_cache_min, 0,
  71         "Min number of pages desired on cache queue");
  72 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
  73         CTLFLAG_RW, &vmstats.v_cache_max, 0,
  74         "Max number of pages in cached obj");
  75 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
  76         CTLFLAG_RW, &vmstats.v_pageout_free_min, 0,
  77         "Min number pages reserved for kernel");
  78 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
  79         CTLFLAG_RW, &vmstats.v_free_severe, 0, "");
  80
  81 SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
  82     &averunnable, loadavg, "Machine loadaverage history");
  83
  84 static int do_vmtotal_callback(struct proc *p, void *data);
  85
  86 /*
  87  * No requirements.
  88  */
  89 static int
  90 do_vmtotal(SYSCTL_HANDLER_ARGS)
  91 {
  92         struct vmtotal total;
  93         struct vmtotal *totalp;
  94         struct vm_object marker;
  95         vm_object_t object;
  96         long collisions;
  97         int burst;
  98
  99         bzero(&total, sizeof(total));
 100         totalp = &total;
 101         bzero(&marker, sizeof(marker));
 102         marker.type = OBJT_MARKER;
 103         collisions = vmobj_token.t_collisions;
 104
 105 #if 0
 106         /*
 107          * Mark all objects as inactive.
 108          */
 109         lwkt_gettoken(&vmobj_token);
 110         for (object = TAILQ_FIRST(&vm_object_list);
 111             object != NULL;
 112             object = TAILQ_NEXT(object,object_list)) {
 113                 if (object->type == OBJT_MARKER)
 114                         continue;
 115                 vm_object_clear_flag(object, OBJ_ACTIVE);
 116         }
 117         lwkt_reltoken(&vmobj_token);
 118 #endif
 119
 120         /*
 121          * Calculate process statistics.
 122          */
 123         allproc_scan(do_vmtotal_callback, totalp);
 124
 125         /*
 126          * Calculate object memory usage statistics.
 127          */
 128         lwkt_gettoken(&vmobj_token);
 129         TAILQ_INSERT_HEAD(&vm_object_list, &marker, object_list);
 130         burst = 0;
 131
 132         for (object = TAILQ_FIRST(&vm_object_list);
 133             object != NULL;
 134             object = TAILQ_NEXT(object, object_list)) {
 135                 /*
 136                  * devices, like /dev/mem, will badly skew our totals.
 137                  * markers aren't real objects.
 138                  */
 139                 if (object->type == OBJT_MARKER)
 140                         continue;
 141                 if (object->type == OBJT_DEVICE)
 142                         continue;
 143                 if (object->size >= 0x7FFFFFFF) {
 144                         /*
 145                          * Probably unbounded anonymous memory (really
 146                          * bounded by related vm_map_entry structures which
 147                          * we do not have access to in this loop).
 148                          */
 149                         totalp->t_vm += object->resident_page_count;
 150                 } else {
 151                         /*
 152                          * It's questionable how useful this is but...
 153                          */
 154                         totalp->t_vm += object->size;
 155                 }
 156                 totalp->t_rm += object->resident_page_count;
 157                 if (object->flags & OBJ_ACTIVE) {
 158                         totalp->t_avm += object->size;
 159                         totalp->t_arm += object->resident_page_count;
 160                 }
 161                 if (object->shadow_count > 1) {
 162                         /* shared object */
 163                         totalp->t_vmshr += object->size;
 164                         totalp->t_rmshr += object->resident_page_count;
 165                         if (object->flags & OBJ_ACTIVE) {
 166                                 totalp->t_avmshr += object->size;
 167                                 totalp->t_armshr += object->resident_page_count;
 168                         }
 169                 }
 170
 171                 /*
 172                  * Don't waste time unnecessarily
 173                  */
 174                 if (++burst < 25)
 175                         continue;
 176                 burst = 0;
 177
 178                 /*
 179                  * Don't hog the vmobj_token if someone else wants it.
 180                  */
 181                 TAILQ_REMOVE(&vm_object_list, &marker, object_list);
 182                 TAILQ_INSERT_AFTER(&vm_object_list, object,
 183                                    &marker, object_list);
 184                 object = &marker;
 185                 if (collisions != vmobj_token.t_collisions) {
 186                         tsleep(&vm_object_list, 0, "breath", 1);
 187                         collisions = vmobj_token.t_collisions;
 188                 } else {
 189                         lwkt_yield();
 190                 }
 191         }
 192
 193         TAILQ_REMOVE(&vm_object_list, &marker, object_list);
 194         lwkt_reltoken(&vmobj_token);
 195
 196         totalp->t_free = vmstats.v_free_count + vmstats.v_cache_count;
 197
 198         return (sysctl_handle_opaque(oidp, totalp, sizeof total, req));
 199 }
 200
 201 /*
 202  * The caller must hold proc_token.
 203  */
 204 static int
 205 do_vmtotal_callback(struct proc *p, void *data)
 206 {
 207         struct vmtotal *totalp = data;
 208         struct lwp *lp;
 209
 210         if (p->p_flags & P_SYSTEM)
 211                 return(0);
 212
 213         FOREACH_LWP_IN_PROC(lp, p) {
 214                 switch (lp->lwp_stat) {
 215                 case LSSTOP:
 216                 case LSSLEEP:
 217                         if ((p->p_flags & P_SWAPPEDOUT) == 0) {
 218                                 if ((lp->lwp_flags & LWP_SINTR) == 0)
 219                                         totalp->t_dw++;
 220                                 else if (lp->lwp_slptime < maxslp)
 221                                         totalp->t_sl++;
 222                         } else if (lp->lwp_slptime < maxslp) {
 223                                 totalp->t_sw++;
 224                         }
 225                         if (lp->lwp_slptime >= maxslp)
 226                                 return(0);
 227                         break;
 228
 229                 case LSRUN:
 230                         if (p->p_flags & P_SWAPPEDOUT)
 231                                 totalp->t_sw++;
 232                         else
 233                                 totalp->t_rq++;
 234                         if (p->p_stat == SIDL)
 235                                 return(0);
 236                         break;
 237
 238                 default:
 239                         return (0);
 240                 }
 241
 242                 /*
 243                  * Set while in vm_fault()
 244                  */
 245                 if (lp->lwp_flags & LWP_PAGING)
 246                         totalp->t_pw++;
 247         }
 248         return(0);
 249 }
 250
 251 /*
 252  * No requirements.
 253  */
 254 static int
 255 do_vmstats(SYSCTL_HANDLER_ARGS)
 256 {
 257         struct vmstats vms = vmstats;
 258         return (sysctl_handle_opaque(oidp, &vms, sizeof(vms), req));
 259 }
 260
 261 /*
 262  * No requirements.
 263  */
 264 static int
 265 do_vmmeter(SYSCTL_HANDLER_ARGS)
 266 {
 267         int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 268         int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 269         struct vmmeter vmm;
 270         int i;
 271
 272         bzero(&vmm, sizeof(vmm));
 273         for (i = 0; i < ncpus; ++i) {
 274                 int off;
 275                 struct globaldata *gd = globaldata_find(i);
 276
 277                 for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 278                         *(u_int *)((char *)&vmm + off) +=
 279                                 *(u_int *)((char *)&gd->gd_cnt + off);
 280                 }
 281
 282         }
 283         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 284         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 285 }
 286
 287 /*
 288  * vcnt() -     accumulate statistics from the cnt structure for each cpu
 289  *
 290  *      The vmmeter structure is now per-cpu as well as global.  Those
 291  *      statistics which can be kept on a per-cpu basis (to avoid cache
 292  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
 293  *      statistics, such as v_free_reserved, are left in the global
 294  *      structure.
 295  *
 296  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
 297  *
 298  * No requirements.
 299  */
 300 static int
 301 vcnt(SYSCTL_HANDLER_ARGS)
 302 {
 303         int i;
 304         int count = 0;
 305         int offset = arg2;
 306
 307         for (i = 0; i < ncpus; ++i) {
 308                 struct globaldata *gd = globaldata_find(i);
 309                 count += *(int *)((char *)&gd->gd_cnt + offset);
 310         }
 311         return(SYSCTL_OUT(req, &count, sizeof(int)));
 312 }
 313
 314 /*
 315  * No requirements.
 316  */
 317 static int
 318 vcnt_intr(SYSCTL_HANDLER_ARGS)
 319 {
 320         int i;
 321         int count = 0;
 322
 323         for (i = 0; i < ncpus; ++i) {
 324                 struct globaldata *gd = globaldata_find(i);
 325
 326                 count += gd->gd_cnt.v_intr + gd->gd_cnt.v_ipi +
 327                          gd->gd_cnt.v_timer;
 328         }
 329         return(SYSCTL_OUT(req, &count, sizeof(int)));
 330 }
 331
 332 #define VMMETEROFF(var) offsetof(struct vmmeter, var)
 333
 334 SYSCTL_PROC(_vm, OID_AUTO, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
 335     0, sizeof(struct vmtotal), do_vmtotal, "S,vmtotal",
 336     "System virtual memory aggregate");
 337 SYSCTL_PROC(_vm, OID_AUTO, vmstats, CTLTYPE_OPAQUE|CTLFLAG_RD,
 338     0, sizeof(struct vmstats), do_vmstats, "S,vmstats",
 339     "System virtual memory statistics");
 340 SYSCTL_PROC(_vm, OID_AUTO, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
 341     0, sizeof(struct vmmeter), do_vmmeter, "S,vmmeter",
 342     "System statistics");
 343 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 344 SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
 345 SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
 346 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 347
 348 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
 349         0, VMMETEROFF(v_swtch), vcnt, "IU", "Context switches");
 350 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_coll, CTLTYPE_UINT|CTLFLAG_RD,
 351         0, VMMETEROFF(v_intrans_coll), vcnt, "IU", "Intransit map collisions (total)");
 352 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_wait, CTLTYPE_UINT|CTLFLAG_RD,
 353         0, VMMETEROFF(v_intrans_wait), vcnt, "IU", "Intransit map collisions which blocked");
 354 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_ints, CTLTYPE_UINT|CTLFLAG_RD,
 355         0, VMMETEROFF(v_forwarded_ints), vcnt, "IU", "Forwarded interrupts due to MP lock");
 356 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_hits, CTLTYPE_UINT|CTLFLAG_RD,
 357         0, VMMETEROFF(v_forwarded_hits), vcnt, "IU", "Forwarded hits due to MP lock");
 358 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_misses, CTLTYPE_UINT|CTLFLAG_RD,
 359         0, VMMETEROFF(v_forwarded_misses), vcnt, "IU", "Forwarded misses due to MP lock");
 360 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
 361         0, VMMETEROFF(v_trap), vcnt, "IU", "Traps");
 362 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
 363         0, VMMETEROFF(v_syscall), vcnt, "IU", "Syscalls");
 364 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
 365         0, VMMETEROFF(v_intr), vcnt_intr, "IU", "Hardware interrupts");
 366 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_ipi, CTLTYPE_UINT|CTLFLAG_RD,
 367         0, VMMETEROFF(v_ipi), vcnt, "IU", "Inter-processor interrupts");
 368 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_timer, CTLTYPE_UINT|CTLFLAG_RD,
 369         0, VMMETEROFF(v_timer), vcnt, "IU", "LAPIC timer interrupts");
 370 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
 371         0, VMMETEROFF(v_soft), vcnt, "IU", "Software interrupts");
 372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
 373         0, VMMETEROFF(v_vm_faults), vcnt, "IU", "VM faults");
 374 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
 375         0, VMMETEROFF(v_cow_faults), vcnt, "IU", "COW faults");
 376 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
 377         0, VMMETEROFF(v_cow_optim), vcnt, "IU", "Optimized COW faults");
 378 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
 379         0, VMMETEROFF(v_zfod), vcnt, "IU", "Zero fill");
 380 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
 381         0, VMMETEROFF(v_ozfod), vcnt, "IU", "Optimized zero fill");
 382 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
 383         0, VMMETEROFF(v_swapin), vcnt, "IU", "Swapin operations");
 384 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
 385         0, VMMETEROFF(v_swapout), vcnt, "IU", "Swapout operations");
 386 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
 387         0, VMMETEROFF(v_swappgsin), vcnt, "IU", "Swapin pages");
 388 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
 389         0, VMMETEROFF(v_swappgsout), vcnt, "IU", "Swapout pages");
 390 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
 391         0, VMMETEROFF(v_vnodein), vcnt, "IU", "Vnodein operations");
 392 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
 393         0, VMMETEROFF(v_vnodeout), vcnt, "IU", "Vnodeout operations");
 394 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
 395         0, VMMETEROFF(v_vnodepgsin), vcnt, "IU", "Vnodein pages");
 396 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
 397         0, VMMETEROFF(v_vnodepgsout), vcnt, "IU", "Vnodeout pages");
 398 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
 399         0, VMMETEROFF(v_intrans), vcnt, "IU", "In transit page blocking");
 400 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
 401         0, VMMETEROFF(v_reactivated), vcnt, "IU", "Reactivated pages");
 402 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 403         0, VMMETEROFF(v_pdwakeups), vcnt, "IU", "Pagedaemon wakeups");
 404 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ppwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 405         0, VMMETEROFF(v_ppwakeups), vcnt, "IU", "vm_wait wakeups");
 406 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
 407         0, VMMETEROFF(v_pdpages), vcnt, "IU", "Pagedaemon page scans");
 408 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
 409         0, VMMETEROFF(v_dfree), vcnt, "IU", "Pages freed by daemon");
 410 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
 411         0, VMMETEROFF(v_pfree), vcnt, "IU", "Pages freed by exiting processes");
 412 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
 413         0, VMMETEROFF(v_tfree), vcnt, "IU", "Total pages freed");
 414 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
 415         0, VMMETEROFF(v_forks), vcnt, "IU", "Number of fork() calls");
 416 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
 417         0, VMMETEROFF(v_vforks), vcnt, "IU", "Number of vfork() calls");
 418 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
 419         0, VMMETEROFF(v_rforks), vcnt, "IU", "Number of rfork() calls");
 420 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
 421         0, VMMETEROFF(v_kthreads), vcnt, "IU", "Number of fork() calls by kernel");
 422 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
 423         0, VMMETEROFF(v_forkpages), vcnt, "IU", "VM pages affected by fork()");
 424 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 425         0, VMMETEROFF(v_vforkpages), vcnt, "IU", "VM pages affected by vfork()");
 426 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 427         0, VMMETEROFF(v_rforkpages), vcnt, "IU", "VM pages affected by rfork()");
 428 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
 429         0, VMMETEROFF(v_kthreadpages), vcnt, "IU", "VM pages affected by fork() by kernel");
 430
 431 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 432         v_page_size, CTLFLAG_RD, &vmstats.v_page_size, 0,
 433         "Page size in bytes");
 434 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 435         v_page_count, CTLFLAG_RD, &vmstats.v_page_count, 0,
 436         "Total number of pages in system");
 437 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 438         v_free_reserved, CTLFLAG_RD, &vmstats.v_free_reserved, 0,
 439         "Number of pages reserved for deadlock");
 440 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 441         v_free_target, CTLFLAG_RD, &vmstats.v_free_target, 0,
 442         "Number of pages desired free");
 443 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 444         v_free_min, CTLFLAG_RD, &vmstats.v_free_min, 0,
 445         "Minimum number of pages desired free");
 446 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 447         v_free_count, CTLFLAG_RD, &vmstats.v_free_count, 0,
 448         "Number of pages free");
 449 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 450         v_wire_count, CTLFLAG_RD, &vmstats.v_wire_count, 0,
 451         "Number of pages wired down");
 452 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 453         v_active_count, CTLFLAG_RD, &vmstats.v_active_count, 0,
 454         "Number of pages active");
 455 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 456         v_inactive_target, CTLFLAG_RD, &vmstats.v_inactive_target, 0,
 457         "Number of pages desired inactive");
 458 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 459         v_inactive_count, CTLFLAG_RD, &vmstats.v_inactive_count, 0,
 460         "Number of pages inactive");
 461 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 462         v_cache_count, CTLFLAG_RD, &vmstats.v_cache_count, 0,
 463         "Number of pages on buffer cache queue");
 464 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 465         v_cache_min, CTLFLAG_RD, &vmstats.v_cache_min, 0,
 466         "Min number of pages desired on cache queue");
 467 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 468         v_cache_max, CTLFLAG_RD, &vmstats.v_cache_max, 0,
 469         "Max number of pages in cached obj");
 470 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 471         v_pageout_free_min, CTLFLAG_RD, &vmstats.v_pageout_free_min, 0,
 472         "Min number pages reserved for kernel");
 473 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 474         v_interrupt_free_min, CTLFLAG_RD, &vmstats.v_interrupt_free_min, 0,
 475         "Reserved number of pages for int code");
 476 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
 477         zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0,
 478         "Number of zeroing pages");
 479
 480 /*
 481  * No requirements.
 482  */
 483 static int
 484 do_vmmeter_pcpu(SYSCTL_HANDLER_ARGS)
 485 {
 486         int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 487         int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 488         struct globaldata *gd = arg1;
 489         struct vmmeter vmm;
 490         int off;
 491
 492         bzero(&vmm, sizeof(vmm));
 493         for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 494                 *(u_int *)((char *)&vmm + off) +=
 495                         *(u_int *)((char *)&gd->gd_cnt + off);
 496         }
 497         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 498         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 499 }
 500
 501 /*
 502  * Called from the low level boot code only.
 503  */
 504 static void
 505 vmmeter_init(void *dummy __unused)
 506 {
 507         int i;
 508
 509         for (i = 0; i < ncpus; ++i) {
 510                 struct sysctl_ctx_list *ctx;
 511                 struct sysctl_oid *oid;
 512                 struct globaldata *gd;
 513                 char name[32];
 514
 515                 ksnprintf(name, sizeof(name), "cpu%d", i);
 516
 517                 ctx = kmalloc(sizeof(*ctx), M_TEMP, M_WAITOK);
 518                 sysctl_ctx_init(ctx);
 519                 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(_vm),
 520                                       OID_AUTO, name, CTLFLAG_RD, 0, "");
 521
 522                 gd = globaldata_find(i);
 523                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
 524                                 "vmmeter", CTLTYPE_OPAQUE|CTLFLAG_RD,
 525                                 gd, sizeof(struct vmmeter), do_vmmeter_pcpu,
 526                                 "S,vmmeter", "System per-cpu statistics");
 527         }
 528 }
 529 SYSINIT(vmmeter, SI_SUB_PSEUDO, SI_ORDER_ANY, vmmeter_init, 0);