sys/vm/vm_meter.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/lock.h>
  41 #include <sys/malloc.h>
  42 #include <sys/mutex.h>
  43 #include <sys/proc.h>
  44 #include <sys/resource.h>
  45 #include <sys/rwlock.h>
  46 #include <sys/sx.h>
  47 #include <sys/vmmeter.h>
  48 #include <sys/smp.h>
  49
  50 #include <vm/vm.h>
  51 #include <vm/vm_page.h>
  52 #include <vm/vm_extern.h>
  53 #include <vm/vm_param.h>
  54 #include <vm/vm_phys.h>
  55 #include <vm/vm_pagequeue.h>
  56 #include <vm/pmap.h>
  57 #include <vm/vm_map.h>
  58 #include <vm/vm_object.h>
  59 #include <sys/sysctl.h>
  60
  61 struct vmmeter __read_mostly vm_cnt = {
  62         .v_swtch = EARLY_COUNTER,
  63         .v_trap = EARLY_COUNTER,
  64         .v_syscall = EARLY_COUNTER,
  65         .v_intr = EARLY_COUNTER,
  66         .v_soft = EARLY_COUNTER,
  67         .v_vm_faults = EARLY_COUNTER,
  68         .v_io_faults = EARLY_COUNTER,
  69         .v_cow_faults = EARLY_COUNTER,
  70         .v_cow_optim = EARLY_COUNTER,
  71         .v_zfod = EARLY_COUNTER,
  72         .v_ozfod = EARLY_COUNTER,
  73         .v_swapin = EARLY_COUNTER,
  74         .v_swapout = EARLY_COUNTER,
  75         .v_swappgsin = EARLY_COUNTER,
  76         .v_swappgsout = EARLY_COUNTER,
  77         .v_vnodein = EARLY_COUNTER,
  78         .v_vnodeout = EARLY_COUNTER,
  79         .v_vnodepgsin = EARLY_COUNTER,
  80         .v_vnodepgsout = EARLY_COUNTER,
  81         .v_intrans = EARLY_COUNTER,
  82         .v_reactivated = EARLY_COUNTER,
  83         .v_pdwakeups = EARLY_COUNTER,
  84         .v_pdpages = EARLY_COUNTER,
  85         .v_pdshortfalls = EARLY_COUNTER,
  86         .v_dfree = EARLY_COUNTER,
  87         .v_pfree = EARLY_COUNTER,
  88         .v_tfree = EARLY_COUNTER,
  89         .v_forks = EARLY_COUNTER,
  90         .v_vforks = EARLY_COUNTER,
  91         .v_rforks = EARLY_COUNTER,
  92         .v_kthreads = EARLY_COUNTER,
  93         .v_forkpages = EARLY_COUNTER,
  94         .v_vforkpages = EARLY_COUNTER,
  95         .v_rforkpages = EARLY_COUNTER,
  96         .v_kthreadpages = EARLY_COUNTER,
  97         .v_wire_count = EARLY_COUNTER,
  98 };
  99
 100 static void
 101 vmcounter_startup(void)
 102 {
 103         counter_u64_t *cnt = (counter_u64_t *)&vm_cnt;
 104
 105         COUNTER_ARRAY_ALLOC(cnt, VM_METER_NCOUNTERS, M_WAITOK);
 106 }
 107 SYSINIT(counter, SI_SUB_KMEM, SI_ORDER_FIRST, vmcounter_startup, NULL);
 108
 109 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
 110         CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
 111 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
 112         CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
 113 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
 114         CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
 115 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
 116         CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
 117 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
 118         CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
 119 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
 120         CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
 121
 122 static int
 123 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
 124 {
 125
 126 #ifdef SCTL_MASK32
 127         u_int32_t la[4];
 128
 129         if (req->flags & SCTL_MASK32) {
 130                 la[0] = averunnable.ldavg[0];
 131                 la[1] = averunnable.ldavg[1];
 132                 la[2] = averunnable.ldavg[2];
 133                 la[3] = averunnable.fscale;
 134                 return SYSCTL_OUT(req, la, sizeof(la));
 135         } else
 136 #endif
 137                 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
 138 }
 139 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
 140     CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
 141     "Machine loadaverage history");
 142
 143 /*
 144  * This function aims to determine if the object is mapped,
 145  * specifically, if it is referenced by a vm_map_entry.  Because
 146  * objects occasionally acquire transient references that do not
 147  * represent a mapping, the method used here is inexact.  However, it
 148  * has very low overhead and is good enough for the advisory
 149  * vm.vmtotal sysctl.
 150  */
 151 static bool
 152 is_object_active(vm_object_t obj)
 153 {
 154
 155         return (obj->ref_count > obj->shadow_count);
 156 }
 157
 158 #if defined(COMPAT_FREEBSD11)
 159 struct vmtotal11 {
 160         int16_t t_rq;
 161         int16_t t_dw;
 162         int16_t t_pw;
 163         int16_t t_sl;
 164         int16_t t_sw;
 165         int32_t t_vm;
 166         int32_t t_avm;
 167         int32_t t_rm;
 168         int32_t t_arm;
 169         int32_t t_vmshr;
 170         int32_t t_avmshr;
 171         int32_t t_rmshr;
 172         int32_t t_armshr;
 173         int32_t t_free;
 174 };
 175 #endif
 176
 177 static int
 178 vmtotal(SYSCTL_HANDLER_ARGS)
 179 {
 180         struct vmtotal total;
 181 #if defined(COMPAT_FREEBSD11)
 182         struct vmtotal11 total11;
 183 #endif
 184         vm_object_t object;
 185         struct proc *p;
 186         struct thread *td;
 187
 188         if (req->oldptr == NULL) {
 189 #if defined(COMPAT_FREEBSD11)
 190                 if (curproc->p_osrel < P_OSREL_VMTOTAL64)
 191                         return (SYSCTL_OUT(req, NULL, sizeof(total11)));
 192 #endif
 193                 return (SYSCTL_OUT(req, NULL, sizeof(total)));
 194         }
 195         bzero(&total, sizeof(total));
 196
 197         /*
 198          * Calculate process statistics.
 199          */
 200         sx_slock(&allproc_lock);
 201         FOREACH_PROC_IN_SYSTEM(p) {
 202                 if ((p->p_flag & P_SYSTEM) != 0)
 203                         continue;
 204                 PROC_LOCK(p);
 205                 if (p->p_state != PRS_NEW) {
 206                         FOREACH_THREAD_IN_PROC(p, td) {
 207                                 thread_lock(td);
 208                                 switch (td->td_state) {
 209                                 case TDS_INHIBITED:
 210                                         if (TD_IS_SWAPPED(td))
 211                                                 total.t_sw++;
 212                                         else if (TD_IS_SLEEPING(td)) {
 213                                                 if (td->td_priority <= PZERO)
 214                                                         total.t_dw++;
 215                                                 else
 216                                                         total.t_sl++;
 217                                         }
 218                                         break;
 219                                 case TDS_CAN_RUN:
 220                                         total.t_sw++;
 221                                         break;
 222                                 case TDS_RUNQ:
 223                                 case TDS_RUNNING:
 224                                         total.t_rq++;
 225                                         break;
 226                                 default:
 227                                         break;
 228                                 }
 229                                 thread_unlock(td);
 230                         }
 231                 }
 232                 PROC_UNLOCK(p);
 233         }
 234         sx_sunlock(&allproc_lock);
 235         /*
 236          * Calculate object memory usage statistics.
 237          */
 238         mtx_lock(&vm_object_list_mtx);
 239         TAILQ_FOREACH(object, &vm_object_list, object_list) {
 240                 /*
 241                  * Perform unsynchronized reads on the object.  In
 242                  * this case, the lack of synchronization should not
 243                  * impair the accuracy of the reported statistics.
 244                  */
 245                 if ((object->flags & OBJ_FICTITIOUS) != 0) {
 246                         /*
 247                          * Devices, like /dev/mem, will badly skew our totals.
 248                          */
 249                         continue;
 250                 }
 251                 if (object->ref_count == 0) {
 252                         /*
 253                          * Also skip unreferenced objects, including
 254                          * vnodes representing mounted file systems.
 255                          */
 256                         continue;
 257                 }
 258                 if (object->ref_count == 1 &&
 259                     (object->flags & OBJ_NOSPLIT) != 0) {
 260                         /*
 261                          * Also skip otherwise unreferenced swap
 262                          * objects backing tmpfs vnodes, and POSIX or
 263                          * SysV shared memory.
 264                          */
 265                         continue;
 266                 }
 267                 total.t_vm += object->size;
 268                 total.t_rm += object->resident_page_count;
 269                 if (is_object_active(object)) {
 270                         total.t_avm += object->size;
 271                         total.t_arm += object->resident_page_count;
 272                 }
 273                 if (object->shadow_count > 1) {
 274                         /* shared object */
 275                         total.t_vmshr += object->size;
 276                         total.t_rmshr += object->resident_page_count;
 277                         if (is_object_active(object)) {
 278                                 total.t_avmshr += object->size;
 279                                 total.t_armshr += object->resident_page_count;
 280                         }
 281                 }
 282         }
 283         mtx_unlock(&vm_object_list_mtx);
 284         total.t_pw = vm_wait_count();
 285         total.t_free = vm_free_count();
 286 #if defined(COMPAT_FREEBSD11)
 287         /* sysctl(8) allocates twice as much memory as reported by sysctl(3) */
 288         if (curproc->p_osrel < P_OSREL_VMTOTAL64 && (req->oldlen ==
 289             sizeof(total11) || req->oldlen == 2 * sizeof(total11))) {
 290                 bzero(&total11, sizeof(total11));
 291                 total11.t_rq = total.t_rq;
 292                 total11.t_dw = total.t_dw;
 293                 total11.t_pw = total.t_pw;
 294                 total11.t_sl = total.t_sl;
 295                 total11.t_sw = total.t_sw;
 296                 total11.t_vm = total.t_vm;      /* truncate */
 297                 total11.t_avm = total.t_avm;    /* truncate */
 298                 total11.t_rm = total.t_rm;      /* truncate */
 299                 total11.t_arm = total.t_arm;    /* truncate */
 300                 total11.t_vmshr = total.t_vmshr;        /* truncate */
 301                 total11.t_avmshr = total.t_avmshr;      /* truncate */
 302                 total11.t_rmshr = total.t_rmshr;        /* truncate */
 303                 total11.t_armshr = total.t_armshr;      /* truncate */
 304                 total11.t_free = total.t_free;          /* truncate */
 305                 return (SYSCTL_OUT(req, &total11, sizeof(total11)));
 306         }
 307 #endif
 308         return (SYSCTL_OUT(req, &total, sizeof(total)));
 309 }
 310
 311 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE | CTLFLAG_RD |
 312     CTLFLAG_MPSAFE, NULL, 0, vmtotal, "S,vmtotal",
 313     "System virtual memory statistics");
 314 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 315 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
 316         "VM meter sys stats");
 317 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
 318         "VM meter vm stats");
 319 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 320
 321 static int
 322 sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS)
 323 {
 324         uint64_t val;
 325 #ifdef COMPAT_FREEBSD11
 326         uint32_t val32;
 327 #endif
 328
 329         val = counter_u64_fetch(*(counter_u64_t *)arg1);
 330 #ifdef COMPAT_FREEBSD11
 331         if (req->oldlen == sizeof(val32)) {
 332                 val32 = val;            /* truncate */
 333                 return (SYSCTL_OUT(req, &val32, sizeof(val32)));
 334         }
 335 #endif
 336         return (SYSCTL_OUT(req, &val, sizeof(val)));
 337 }
 338
 339 #define VM_STATS(parent, var, descr) \
 340     SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \
 341     CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr)
 342 #define VM_STATS_VM(var, descr)         VM_STATS(_vm_stats_vm, var, descr)
 343 #define VM_STATS_SYS(var, descr)        VM_STATS(_vm_stats_sys, var, descr)
 344
 345 VM_STATS_SYS(v_swtch, "Context switches");
 346 VM_STATS_SYS(v_trap, "Traps");
 347 VM_STATS_SYS(v_syscall, "System calls");
 348 VM_STATS_SYS(v_intr, "Device interrupts");
 349 VM_STATS_SYS(v_soft, "Software interrupts");
 350 VM_STATS_VM(v_vm_faults, "Address memory faults");
 351 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
 352 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
 353 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
 354 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
 355 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
 356 VM_STATS_VM(v_swapin, "Swap pager pageins");
 357 VM_STATS_VM(v_swapout, "Swap pager pageouts");
 358 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
 359 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
 360 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
 361 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
 362 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
 363 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
 364 VM_STATS_VM(v_intrans, "In transit page faults");
 365 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon");
 366 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
 367 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
 368 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls");
 369 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
 370 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
 371 VM_STATS_VM(v_tfree, "Total pages freed");
 372 VM_STATS_VM(v_forks, "Number of fork() calls");
 373 VM_STATS_VM(v_vforks, "Number of vfork() calls");
 374 VM_STATS_VM(v_rforks, "Number of rfork() calls");
 375 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
 376 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
 377 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
 378 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
 379 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
 380
 381 static int
 382 sysctl_handle_vmstat_proc(SYSCTL_HANDLER_ARGS)
 383 {
 384         u_int (*fn)(void);
 385         uint32_t val;
 386
 387         fn = arg1;
 388         val = fn();
 389         return (SYSCTL_OUT(req, &val, sizeof(val)));
 390 }
 391
 392 #define VM_STATS_PROC(var, descr, fn) \
 393     SYSCTL_OID(_vm_stats_vm, OID_AUTO, var, CTLTYPE_U32 | CTLFLAG_MPSAFE | \
 394     CTLFLAG_RD, fn, 0, sysctl_handle_vmstat_proc, "IU", descr)
 395
 396 #define VM_STATS_UINT(var, descr)       \
 397     SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
 398
 399 VM_STATS_UINT(v_page_size, "Page size in bytes");
 400 VM_STATS_UINT(v_page_count, "Total number of pages in system");
 401 VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock");
 402 VM_STATS_UINT(v_free_target, "Pages desired free");
 403 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold");
 404 VM_STATS_PROC(v_free_count, "Free pages", vm_free_count);
 405 VM_STATS_PROC(v_wire_count, "Wired pages", vm_wire_count);
 406 VM_STATS_PROC(v_active_count, "Active pages", vm_active_count);
 407 VM_STATS_UINT(v_inactive_target, "Desired inactive pages");
 408 VM_STATS_PROC(v_inactive_count, "Inactive pages", vm_inactive_count);
 409 VM_STATS_PROC(v_laundry_count, "Pages eligible for laundering",
 410     vm_laundry_count);
 411 VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel");
 412 VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code");
 413 VM_STATS_UINT(v_free_severe, "Severe page depletion point");
 414
 415 #ifdef COMPAT_FREEBSD11
 416 /*
 417  * Provide compatibility sysctls for the benefit of old utilities which exit
 418  * with an error if they cannot be found.
 419  */
 420 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
 421     SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
 422 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
 423     SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
 424 #endif
 425
 426 u_int
 427 vm_free_count(void)
 428 {
 429         u_int v;
 430         int i;
 431
 432         v = 0;
 433         for (i = 0; i < vm_ndomains; i++)
 434                 v += vm_dom[i].vmd_free_count;
 435
 436         return (v);
 437 }
 438
 439 static
 440 u_int
 441 vm_pagequeue_count(int pq)
 442 {
 443         u_int v;
 444         int i;
 445
 446         v = 0;
 447         for (i = 0; i < vm_ndomains; i++)
 448                 v += vm_dom[i].vmd_pagequeues[pq].pq_cnt;
 449
 450         return (v);
 451 }
 452
 453 u_int
 454 vm_active_count(void)
 455 {
 456
 457         return vm_pagequeue_count(PQ_ACTIVE);
 458 }
 459
 460 u_int
 461 vm_inactive_count(void)
 462 {
 463
 464         return vm_pagequeue_count(PQ_INACTIVE);
 465 }
 466
 467 u_int
 468 vm_laundry_count(void)
 469 {
 470
 471         return vm_pagequeue_count(PQ_LAUNDRY);
 472 }
 473
 474 static void
 475 vm_domain_stats_init(struct vm_domain *vmd, struct sysctl_oid *parent)
 476 {
 477         struct sysctl_oid *oid;
 478
 479         vmd->vmd_oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
 480             vmd->vmd_name, CTLFLAG_RD, NULL, "");
 481         oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(vmd->vmd_oid), OID_AUTO,
 482             "stats", CTLFLAG_RD, NULL, "");
 483         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 484             "free_count", CTLFLAG_RD, &vmd->vmd_free_count, 0,
 485             "Free pages");
 486         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 487             "active", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_ACTIVE].pq_cnt, 0,
 488             "Active pages");
 489         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 490             "inactive", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_INACTIVE].pq_cnt, 0,
 491             "Inactive pages");
 492         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 493             "laundry", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_LAUNDRY].pq_cnt, 0,
 494             "laundry pages");
 495         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "unswappable",
 496             CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_UNSWAPPABLE].pq_cnt, 0,
 497             "Unswappable pages");
 498         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 499             "inactive_target", CTLFLAG_RD, &vmd->vmd_inactive_target, 0,
 500             "Target inactive pages");
 501         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 502             "free_target", CTLFLAG_RD, &vmd->vmd_free_target, 0,
 503             "Target free pages");
 504         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 505             "free_reserved", CTLFLAG_RD, &vmd->vmd_free_reserved, 0,
 506             "Reserved free pages");
 507         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 508             "free_min", CTLFLAG_RD, &vmd->vmd_free_min, 0,
 509             "Minimum free pages");
 510         SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
 511             "free_severe", CTLFLAG_RD, &vmd->vmd_free_severe, 0,
 512             "Severe free pages");
 513
 514 }
 515
 516 static void
 517 vm_stats_init(void *arg __unused)
 518 {
 519         struct sysctl_oid *oid;
 520         int i;
 521
 522         oid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_vm), OID_AUTO,
 523             "domain", CTLFLAG_RD, NULL, "");
 524         for (i = 0; i < vm_ndomains; i++)
 525                 vm_domain_stats_init(VM_DOMAIN(i), oid);
 526 }
 527
 528 SYSINIT(vmstats_init, SI_SUB_VM_CONF, SI_ORDER_FIRST, vm_stats_init, NULL);