partially fix pctcpu and userland rescheduling. We really have to distribute
[dragonfly.git] / sys / vm / vm_meter.c
CommitLineData
984263bc
MD
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: src/sys/vm/vm_meter.c,v 1.34.2.7 2002/10/10 19:28:22 dillon Exp $
6bdb32ed 35 * $DragonFly: src/sys/vm/vm_meter.c,v 1.5 2003/07/03 18:20:03 dillon Exp $
984263bc
MD
36 */
37
38#include <sys/param.h>
39#include <sys/proc.h>
40#include <sys/systm.h>
41#include <sys/kernel.h>
42#include <sys/resource.h>
43#include <sys/vmmeter.h>
44
45#include <vm/vm.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
12e4aaff 55struct vmstats vmstats;
984263bc
MD
56
57static int maxslp = MAXSLP;
58
59SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
12e4aaff 60 CTLFLAG_RW, &vmstats.v_free_min, 0, "");
984263bc 61SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
12e4aaff 62 CTLFLAG_RW, &vmstats.v_free_target, 0, "");
984263bc 63SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
12e4aaff 64 CTLFLAG_RW, &vmstats.v_free_reserved, 0, "");
984263bc 65SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
12e4aaff 66 CTLFLAG_RW, &vmstats.v_inactive_target, 0, "");
984263bc 67SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
12e4aaff 68 CTLFLAG_RW, &vmstats.v_cache_min, 0, "");
984263bc 69SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
12e4aaff 70 CTLFLAG_RW, &vmstats.v_cache_max, 0, "");
984263bc 71SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
12e4aaff 72 CTLFLAG_RW, &vmstats.v_pageout_free_min, 0, "");
984263bc 73SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
12e4aaff 74 CTLFLAG_RW, &vmstats.v_free_severe, 0, "");
984263bc
MD
75
76SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
77 &averunnable, loadavg, "Machine loadaverage history");
78
79static int
6bdb32ed 80do_vmtotal(SYSCTL_HANDLER_ARGS)
984263bc
MD
81{
82 struct proc *p;
83 struct vmtotal total, *totalp;
84 vm_map_entry_t entry;
85 vm_object_t object;
86 vm_map_t map;
87 int paging;
88
89 totalp = &total;
90 bzero(totalp, sizeof *totalp);
91 /*
92 * Mark all objects as inactive.
93 */
94 for (object = TAILQ_FIRST(&vm_object_list);
95 object != NULL;
96 object = TAILQ_NEXT(object,object_list))
97 vm_object_clear_flag(object, OBJ_ACTIVE);
98 /*
99 * Calculate process statistics.
100 */
101 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
102 if (p->p_flag & P_SYSTEM)
103 continue;
104 switch (p->p_stat) {
105 case 0:
106 continue;
107
108 case SSLEEP:
109 case SSTOP:
110 if (p->p_flag & P_INMEM) {
26a0694b 111 /* YYY p_priority */
984263bc
MD
112 if (p->p_priority <= PZERO)
113 totalp->t_dw++;
114 else if (p->p_slptime < maxslp)
115 totalp->t_sl++;
116 } else if (p->p_slptime < maxslp)
117 totalp->t_sw++;
118 if (p->p_slptime >= maxslp)
119 continue;
120 break;
121
122 case SRUN:
123 case SIDL:
124 if (p->p_flag & P_INMEM)
125 totalp->t_rq++;
126 else
127 totalp->t_sw++;
128 if (p->p_stat == SIDL)
129 continue;
130 break;
131 }
132 /*
133 * Note active objects.
134 */
135 paging = 0;
136 for (map = &p->p_vmspace->vm_map, entry = map->header.next;
137 entry != &map->header; entry = entry->next) {
138 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
139 entry->object.vm_object == NULL)
140 continue;
141 vm_object_set_flag(entry->object.vm_object, OBJ_ACTIVE);
142 paging |= entry->object.vm_object->paging_in_progress;
143 }
144 if (paging)
145 totalp->t_pw++;
146 }
147 /*
148 * Calculate object memory usage statistics.
149 */
150 for (object = TAILQ_FIRST(&vm_object_list);
151 object != NULL;
152 object = TAILQ_NEXT(object, object_list)) {
153 /*
154 * devices, like /dev/mem, will badly skew our totals
155 */
156 if (object->type == OBJT_DEVICE)
157 continue;
158 totalp->t_vm += object->size;
159 totalp->t_rm += object->resident_page_count;
160 if (object->flags & OBJ_ACTIVE) {
161 totalp->t_avm += object->size;
162 totalp->t_arm += object->resident_page_count;
163 }
164 if (object->shadow_count > 1) {
165 /* shared object */
166 totalp->t_vmshr += object->size;
167 totalp->t_rmshr += object->resident_page_count;
168 if (object->flags & OBJ_ACTIVE) {
169 totalp->t_avmshr += object->size;
170 totalp->t_armshr += object->resident_page_count;
171 }
172 }
173 }
12e4aaff 174 totalp->t_free = vmstats.v_free_count + vmstats.v_cache_count;
984263bc
MD
175 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req));
176}
177
6bdb32ed
MD
178static int
179do_vmstats(SYSCTL_HANDLER_ARGS)
180{
181 struct vmstats vms = vmstats;
182 return (sysctl_handle_opaque(oidp, &vms, sizeof(vms), req));
183}
184
185static int
186do_vmmeter(SYSCTL_HANDLER_ARGS)
187{
188 int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
189 int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
190 struct vmmeter vmm;
191 int i;
192
193 bzero(&vmm, sizeof(vmm));
194 for (i = 0; i < ncpus; ++i) {
195 int off;
196 struct globaldata *gd = globaldata_find(i);
197
198 for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
199 *(u_int *)((char *)&vmm + off) +=
200 *(u_int *)((char *)&gd->gd_cnt + off);
201 }
202
203 }
204 return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
205}
206
12e4aaff
MD
207/*
208 * vcnt() - accumulate statistics from the cnt structure for each cpu
209 *
210 * The vmmeter structure is now per-cpu as well as global. Those
211 * statistics which can be kept on a per-cpu basis (to avoid cache
212 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
213 * statistics, such as v_free_reserved, are left in the global
214 * structure.
215 *
216 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
217 */
218static int
219vcnt(SYSCTL_HANDLER_ARGS)
220{
221 int i;
222 int count = 0;
6bdb32ed 223 int offset = arg2;
12e4aaff
MD
224
225 for (i = 0; i < ncpus; ++i) {
226 struct globaldata *gd = globaldata_find(i);
227 count += *(int *)((char *)&gd->gd_cnt + offset);
228 }
229 return(SYSCTL_OUT(req, &count, sizeof(int)));
230}
231
6bdb32ed 232#define VMMETEROFF(var) offsetof(struct vmmeter, var)
12e4aaff 233
6bdb32ed
MD
234SYSCTL_PROC(_vm, OID_AUTO, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
235 0, sizeof(struct vmtotal), do_vmtotal, "S,vmtotal",
236 "System virtual memory aggregate");
237SYSCTL_PROC(_vm, OID_AUTO, vmstats, CTLTYPE_OPAQUE|CTLFLAG_RD,
238 0, sizeof(struct vmstats), do_vmstats, "S,vmstats",
984263bc 239 "System virtual memory statistics");
6bdb32ed
MD
240SYSCTL_PROC(_vm, OID_AUTO, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
241 0, sizeof(struct vmmeter), do_vmmeter, "S,vmmeter",
242 "System per-cpu statistics");
984263bc
MD
243SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
244SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
245SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
246SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
12e4aaff
MD
247
248SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed
MD
249 0, VMMETEROFF(v_swtch), vcnt, "IU", "Context switches");
250SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_coll, CTLTYPE_UINT|CTLFLAG_RD,
251 0, VMMETEROFF(v_intrans_coll), vcnt, "IU", "");
252SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_wait, CTLTYPE_UINT|CTLFLAG_RD,
253 0, VMMETEROFF(v_intrans_wait), vcnt, "IU", "");
12e4aaff 254SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 255 0, VMMETEROFF(v_trap), vcnt, "IU", "Traps");
12e4aaff 256SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 257 0, VMMETEROFF(v_syscall), vcnt, "IU", "Syscalls");
12e4aaff 258SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 259 0, VMMETEROFF(v_intr), vcnt, "IU", "Hardware interrupts");
12e4aaff 260SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 261 0, VMMETEROFF(v_soft), vcnt, "IU", "Software interrupts");
12e4aaff 262SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 263 0, VMMETEROFF(v_vm_faults), vcnt, "IU", "VM faults");
12e4aaff 264SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 265 0, VMMETEROFF(v_cow_faults), vcnt, "IU", "COW faults");
12e4aaff 266SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 267 0, VMMETEROFF(v_cow_optim), vcnt, "IU", "Optimized COW faults");
12e4aaff 268SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 269 0, VMMETEROFF(v_zfod), vcnt, "IU", "Zero fill");
12e4aaff 270SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 271 0, VMMETEROFF(v_ozfod), vcnt, "IU", "Optimized zero fill");
12e4aaff 272SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 273 0, VMMETEROFF(v_swapin), vcnt, "IU", "Swapin operations");
12e4aaff 274SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 275 0, VMMETEROFF(v_swapout), vcnt, "IU", "Swapout operations");
12e4aaff 276SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 277 0, VMMETEROFF(v_swappgsin), vcnt, "IU", "Swapin pages");
12e4aaff 278SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 279 0, VMMETEROFF(v_swappgsout), vcnt, "IU", "Swapout pages");
12e4aaff 280SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 281 0, VMMETEROFF(v_vnodein), vcnt, "IU", "Vnodein operations");
12e4aaff 282SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 283 0, VMMETEROFF(v_vnodeout), vcnt, "IU", "Vnodeout operations");
12e4aaff 284SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 285 0, VMMETEROFF(v_vnodepgsin), vcnt, "IU", "Vnodein pages");
12e4aaff 286SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 287 0, VMMETEROFF(v_vnodepgsout), vcnt, "IU", "Vnodeout pages");
12e4aaff 288SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 289 0, VMMETEROFF(v_intrans), vcnt, "IU", "In transit page blocking");
12e4aaff 290SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 291 0, VMMETEROFF(v_reactivated), vcnt, "IU", "Reactivated pages");
12e4aaff 292SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 293 0, VMMETEROFF(v_pdwakeups), vcnt, "IU", "Pagedaemon wakeups");
12e4aaff 294SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 295 0, VMMETEROFF(v_pdpages), vcnt, "IU", "Pagedaemon page scans");
12e4aaff 296SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 297 0, VMMETEROFF(v_dfree), vcnt, "IU", "");
12e4aaff 298SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 299 0, VMMETEROFF(v_pfree), vcnt, "IU", "");
12e4aaff 300SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 301 0, VMMETEROFF(v_tfree), vcnt, "IU", "");
12e4aaff 302SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 303 0, VMMETEROFF(v_forks), vcnt, "IU", "Number of fork() calls");
12e4aaff 304SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 305 0, VMMETEROFF(v_vforks), vcnt, "IU", "Number of vfork() calls");
12e4aaff 306SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 307 0, VMMETEROFF(v_rforks), vcnt, "IU", "Number of rfork() calls");
12e4aaff 308SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 309 0, VMMETEROFF(v_kthreads), vcnt, "IU", "Number of fork() calls by kernel");
12e4aaff 310SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 311 0, VMMETEROFF(v_forkpages), vcnt, "IU", "VM pages affected by fork()");
12e4aaff 312SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 313 0, VMMETEROFF(v_vforkpages), vcnt, "IU", "VM pages affected by vfork()");
12e4aaff 314SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 315 0, VMMETEROFF(v_rforkpages), vcnt, "IU", "VM pages affected by rfork()");
12e4aaff 316SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
6bdb32ed 317 0, VMMETEROFF(v_kthreadpages), vcnt, "IU", "VM pages affected by fork() by kernel");
12e4aaff 318
984263bc 319SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 320 v_page_size, CTLFLAG_RD, &vmstats.v_page_size, 0, "");
984263bc 321SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 322 v_page_count, CTLFLAG_RD, &vmstats.v_page_count, 0, "");
984263bc 323SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 324 v_free_reserved, CTLFLAG_RD, &vmstats.v_free_reserved, 0, "");
984263bc 325SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 326 v_free_target, CTLFLAG_RD, &vmstats.v_free_target, 0, "");
984263bc 327SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 328 v_free_min, CTLFLAG_RD, &vmstats.v_free_min, 0, "");
984263bc 329SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 330 v_free_count, CTLFLAG_RD, &vmstats.v_free_count, 0, "");
984263bc 331SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 332 v_wire_count, CTLFLAG_RD, &vmstats.v_wire_count, 0, "");
984263bc 333SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 334 v_active_count, CTLFLAG_RD, &vmstats.v_active_count, 0, "");
984263bc 335SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 336 v_inactive_target, CTLFLAG_RD, &vmstats.v_inactive_target, 0, "");
984263bc 337SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 338 v_inactive_count, CTLFLAG_RD, &vmstats.v_inactive_count, 0, "");
984263bc 339SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 340 v_cache_count, CTLFLAG_RD, &vmstats.v_cache_count, 0, "");
984263bc 341SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 342 v_cache_min, CTLFLAG_RD, &vmstats.v_cache_min, 0, "");
984263bc 343SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 344 v_cache_max, CTLFLAG_RD, &vmstats.v_cache_max, 0, "");
984263bc 345SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 346 v_pageout_free_min, CTLFLAG_RD, &vmstats.v_pageout_free_min, 0, "");
984263bc 347SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
12e4aaff 348 v_interrupt_free_min, CTLFLAG_RD, &vmstats.v_interrupt_free_min, 0, "");
984263bc
MD
349SYSCTL_INT(_vm_stats_misc, OID_AUTO,
350 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");