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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/resource.h> 42 #include <sys/sx.h> 43 #include <sys/vmmeter.h> 44 #include <sys/smp.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_page.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_param.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 vmmeter cnt; 56 57 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 58 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 59 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 60 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 61 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 62 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 63 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 64 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 65 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 66 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 67 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 68 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 69 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 70 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 71 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 72 CTLFLAG_RW, &cnt.v_free_severe, 0, ""); 73 74 static int 75 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 76 { 77 78 #ifdef SCTL_MASK32 79 u_int32_t la[4]; 80 81 if (req->flags & SCTL_MASK32) { 82 la[0] = averunnable.ldavg[0]; 83 la[1] = averunnable.ldavg[1]; 84 la[2] = averunnable.ldavg[2]; 85 la[3] = averunnable.fscale; 86 return SYSCTL_OUT(req, la, sizeof(la)); 87 } else 88 #endif 89 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 90 } 91 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 92 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 93 "Machine loadaverage history"); 94 95 static int 96 vmtotal(SYSCTL_HANDLER_ARGS) 97 { 98 struct proc *p; 99 struct vmtotal total; 100 vm_map_entry_t entry; 101 vm_object_t object; 102 vm_map_t map; 103 int paging; 104 struct thread *td; 105 struct vmspace *vm; 106 107 bzero(&total, sizeof(total)); 108 /* 109 * Mark all objects as inactive. 110 */ 111 mtx_lock(&vm_object_list_mtx); 112 TAILQ_FOREACH(object, &vm_object_list, object_list) { 113 if (!VM_OBJECT_TRYLOCK(object)) { 114 /* 115 * Avoid a lock-order reversal. Consequently, 116 * the reported number of active pages may be 117 * greater than the actual number. 118 */ 119 continue; 120 } 121 vm_object_clear_flag(object, OBJ_ACTIVE); 122 VM_OBJECT_UNLOCK(object); 123 } 124 mtx_unlock(&vm_object_list_mtx); 125 /* 126 * Calculate process statistics. 127 */ 128 sx_slock(&allproc_lock); 129 FOREACH_PROC_IN_SYSTEM(p) { 130 if (p->p_flag & P_SYSTEM) 131 continue; 132 PROC_LOCK(p); 133 PROC_SLOCK(p); 134 switch (p->p_state) { 135 case PRS_NEW: 136 PROC_SUNLOCK(p); 137 PROC_UNLOCK(p); 138 continue; 139 break; 140 default: 141 PROC_SUNLOCK(p); 142 FOREACH_THREAD_IN_PROC(p, td) { 143 thread_lock(td); 144 switch (td->td_state) { 145 case TDS_INHIBITED: 146 if (TD_IS_SWAPPED(td)) 147 total.t_sw++; 148 else if (TD_IS_SLEEPING(td) && 149 td->td_priority <= PZERO) 150 total.t_dw++; 151 else 152 total.t_sl++; 153 break; 154 155 case TDS_CAN_RUN: 156 total.t_sw++; 157 break; 158 case TDS_RUNQ: 159 case TDS_RUNNING: 160 total.t_rq++; 161 thread_unlock(td); 162 continue; 163 default: 164 break; 165 } 166 thread_unlock(td); 167 } 168 } 169 PROC_UNLOCK(p); 170 /* 171 * Note active objects. 172 */ 173 paging = 0; 174 vm = vmspace_acquire_ref(p); 175 if (vm == NULL) 176 continue; 177 map = &vm->vm_map; 178 vm_map_lock_read(map); 179 for (entry = map->header.next; 180 entry != &map->header; entry = entry->next) { 181 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 182 (object = entry->object.vm_object) == NULL) 183 continue; 184 VM_OBJECT_LOCK(object); 185 vm_object_set_flag(object, OBJ_ACTIVE); 186 paging |= object->paging_in_progress; 187 VM_OBJECT_UNLOCK(object); 188 } 189 vm_map_unlock_read(map); 190 vmspace_free(vm); 191 if (paging) 192 total.t_pw++; 193 } 194 sx_sunlock(&allproc_lock); 195 /* 196 * Calculate object memory usage statistics. 197 */ 198 mtx_lock(&vm_object_list_mtx); 199 TAILQ_FOREACH(object, &vm_object_list, object_list) { 200 /* 201 * Perform unsynchronized reads on the object to avoid 202 * a lock-order reversal. In this case, the lack of 203 * synchronization should not impair the accuracy of 204 * the reported statistics. 205 */ 206 if (object->type == OBJT_DEVICE || object->type == OBJT_SG) { 207 /* 208 * Devices, like /dev/mem, will badly skew our totals. 209 */ 210 continue; 211 } 212 if (object->ref_count == 0) { 213 /* 214 * Also skip unreferenced objects, including 215 * vnodes representing mounted file systems. 216 */ 217 continue; 218 } 219 total.t_vm += object->size; 220 total.t_rm += object->resident_page_count; 221 if (object->flags & OBJ_ACTIVE) { 222 total.t_avm += object->size; 223 total.t_arm += object->resident_page_count; 224 } 225 if (object->shadow_count > 1) { 226 /* shared object */ 227 total.t_vmshr += object->size; 228 total.t_rmshr += object->resident_page_count; 229 if (object->flags & OBJ_ACTIVE) { 230 total.t_avmshr += object->size; 231 total.t_armshr += object->resident_page_count; 232 } 233 } 234 } 235 mtx_unlock(&vm_object_list_mtx); 236 total.t_free = cnt.v_free_count + cnt.v_cache_count; 237 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 238 } 239 240 /* 241 * vcnt() - accumulate statistics from all cpus and the global cnt 242 * structure. 243 * 244 * The vmmeter structure is now per-cpu as well as global. Those 245 * statistics which can be kept on a per-cpu basis (to avoid cache 246 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 247 * statistics, such as v_free_reserved, are left in the global 248 * structure. 249 * 250 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 251 */ 252 static int 253 vcnt(SYSCTL_HANDLER_ARGS) 254 { 255 int count = *(int *)arg1; 256 int offset = (char *)arg1 - (char *)&cnt; 257 int i; 258 259 CPU_FOREACH(i) { 260 struct pcpu *pcpu = pcpu_find(i); 261 count += *(int *)((char *)&pcpu->pc_cnt + offset); 262 } 263 return (SYSCTL_OUT(req, &count, sizeof(int))); 264 } 265 266 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 267 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 268 "System virtual memory statistics"); 269 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 270 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 271 "VM meter sys stats"); 272 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 273 "VM meter vm stats"); 274 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 275 276 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 277 &cnt.v_swtch, 0, vcnt, "IU", "Context switches"); 278 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 279 &cnt.v_trap, 0, vcnt, "IU", "Traps"); 280 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 281 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls"); 282 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 283 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts"); 284 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 285 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts"); 286 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 287 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults"); 288 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 289 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults"); 290 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 291 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults"); 292 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 293 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill"); 294 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 295 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill"); 296 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 297 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations"); 298 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 299 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations"); 300 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 301 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages"); 302 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 303 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages"); 304 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 305 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations"); 306 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 307 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations"); 308 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 309 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages"); 310 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 311 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages"); 312 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 313 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking"); 314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 315 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages"); 316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 317 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups"); 318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 319 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans"); 320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tcached, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 321 &cnt.v_tcached, 0, vcnt, "IU", "Total pages cached"); 322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 323 &cnt.v_dfree, 0, vcnt, "IU", ""); 324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 325 &cnt.v_pfree, 0, vcnt, "IU", ""); 326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 327 &cnt.v_tfree, 0, vcnt, "IU", ""); 328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 329 &cnt.v_page_size, 0, vcnt, "IU", ""); 330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 331 &cnt.v_page_count, 0, vcnt, "IU", ""); 332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 333 &cnt.v_free_reserved, 0, vcnt, "IU", ""); 334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 335 &cnt.v_free_target, 0, vcnt, "IU", ""); 336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 337 &cnt.v_free_min, 0, vcnt, "IU", ""); 338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 339 &cnt.v_free_count, 0, vcnt, "IU", ""); 340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 341 &cnt.v_wire_count, 0, vcnt, "IU", ""); 342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 343 &cnt.v_active_count, 0, vcnt, "IU", ""); 344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 345 &cnt.v_inactive_target, 0, vcnt, "IU", ""); 346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 347 &cnt.v_inactive_count, 0, vcnt, "IU", ""); 348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 349 &cnt.v_cache_count, 0, vcnt, "IU", ""); 350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 351 &cnt.v_cache_min, 0, vcnt, "IU", ""); 352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 353 &cnt.v_cache_max, 0, vcnt, "IU", ""); 354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 355 &cnt.v_pageout_free_min, 0, vcnt, "IU", ""); 356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 357 &cnt.v_interrupt_free_min, 0, vcnt, "IU", ""); 358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 359 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls"); 360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 361 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls"); 362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 363 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls"); 364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 365 &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel"); 366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 367 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()"); 368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 369 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()"); 370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 371 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()"); 372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE, 373 &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel"); 374 375 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 376 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, ""); 377