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 /*
  54  * WARNING: vmstats represents the final say, but individual cpu's may
  55  *          accumulative adjustments in gd->gd_vmstats_adj.  These are
  56  *          synchronized to the global vmstats in hardclock.
  57  *
  58  *          In addition, most individual cpus check vmstats using a local
  59  *          copy of the global vmstats in gd->gd_vmstats.  Hardclock also
  60  *          sychronizes the copy.  The pageout code and vm_page_alloc will
  61  *          also synchronize their local copies as necessary.
  62  *
  63  *          Other consumers should not expect perfect values.
  64  */
  65 __cachealign struct vmstats vmstats;
  66
  67 static int maxslp = MAXSLP;
  68
  69 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
  70         CTLFLAG_RW, &vmstats.v_free_min, 0,
  71         "Minimum number of pages desired free");
  72 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
  73         CTLFLAG_RW, &vmstats.v_free_target, 0,
  74         "Number of pages desired free");
  75 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
  76         CTLFLAG_RW, &vmstats.v_free_reserved, 0,
  77         "Number of pages reserved for deadlock");
  78 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
  79         CTLFLAG_RW, &vmstats.v_inactive_target, 0,
  80         "Number of pages desired inactive");
  81 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
  82         CTLFLAG_RW, &vmstats.v_cache_min, 0,
  83         "Min number of pages desired on cache queue");
  84 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
  85         CTLFLAG_RW, &vmstats.v_cache_max, 0,
  86         "Max number of pages in cached obj");
  87 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
  88         CTLFLAG_RW, &vmstats.v_pageout_free_min, 0,
  89         "Min number pages reserved for kernel");
  90 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
  91         CTLFLAG_RW, &vmstats.v_free_severe, 0, "");
  92
  93 SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
  94     &averunnable, loadavg, "Machine loadaverage history");
  95
  96 static int do_vmtotal_callback(struct proc *p, void *data);
  97
  98 /*
  99  * No requirements.
 100  */
 101 static int
 102 do_vmtotal(SYSCTL_HANDLER_ARGS)
 103 {
 104         struct vmtotal total;
 105         globaldata_t gd;
 106         int n;
 107
 108         bzero(&total, sizeof(total));
 109         for (n = 0; n < ncpus; ++n) {
 110                 gd = globaldata_find(n);
 111
 112                 /* total.t_rq calculated separately */
 113                 /* total.t_dw calculated separately */
 114                 /* total.t_pw calculated separately */
 115                 /* total.t_sl calculated separately */
 116                 /* total.t_sw calculated separately */
 117                 total.t_vm += gd->gd_vmtotal.t_vm;
 118                 total.t_avm += gd->gd_vmtotal.t_avm;
 119                 total.t_rm += gd->gd_vmtotal.t_rm;
 120                 total.t_arm += gd->gd_vmtotal.t_arm;
 121                 total.t_vmshr += gd->gd_vmtotal.t_vmshr;
 122                 total.t_avmshr += gd->gd_vmtotal.t_avmshr;
 123                 total.t_rmshr += gd->gd_vmtotal.t_rmshr;
 124                 total.t_armshr += gd->gd_vmtotal.t_armshr;
 125                 /* total.t_free calculated separately */
 126         }
 127
 128         /*
 129          * Calculate process statistics.
 130          */
 131         allproc_scan(do_vmtotal_callback, &total);
 132
 133         /*
 134          * Adjust for sysctl return.  Add real memory into virtual memory.
 135          * Set t_free.
 136          *
 137          * t_rm - Real memory
 138          * t_vm - Virtual memory (real + swap)
 139          */
 140         total.t_vm += total.t_rm;
 141         total.t_free = vmstats.v_free_count + vmstats.v_cache_count;
 142
 143         return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
 144 }
 145
 146 static int
 147 do_vmtotal_callback(struct proc *p, void *data)
 148 {
 149         struct vmtotal *totalp = data;
 150         struct lwp *lp;
 151
 152         if (p->p_flags & P_SYSTEM)
 153                 return(0);
 154
 155         lwkt_gettoken(&p->p_token);
 156
 157         FOREACH_LWP_IN_PROC(lp, p) {
 158                 switch (lp->lwp_stat) {
 159                 case LSSTOP:
 160                 case LSSLEEP:
 161                         if ((p->p_flags & P_SWAPPEDOUT) == 0) {
 162                                 if ((lp->lwp_flags & LWP_SINTR) == 0)
 163                                         totalp->t_dw++;
 164                                 else if (lp->lwp_slptime < maxslp)
 165                                         totalp->t_sl++;
 166                         } else if (lp->lwp_slptime < maxslp) {
 167                                 totalp->t_sw++;
 168                         }
 169                         if (lp->lwp_slptime >= maxslp)
 170                                 goto out;
 171                         break;
 172
 173                 case LSRUN:
 174                         if (p->p_flags & P_SWAPPEDOUT)
 175                                 totalp->t_sw++;
 176                         else
 177                                 totalp->t_rq++;
 178                         if (p->p_stat == SIDL)
 179                                 goto out;
 180                         break;
 181
 182                 default:
 183                         goto out;
 184                 }
 185
 186                 /*
 187                  * Set while in vm_fault()
 188                  */
 189                 if (lp->lwp_flags & LWP_PAGING)
 190                         totalp->t_pw++;
 191         }
 192 out:
 193         lwkt_reltoken(&p->p_token);
 194         return(0);
 195 }
 196
 197 /*
 198  * No requirements.
 199  */
 200 static int
 201 do_vmstats(SYSCTL_HANDLER_ARGS)
 202 {
 203         struct vmstats vms = vmstats;
 204         return (sysctl_handle_opaque(oidp, &vms, sizeof(vms), req));
 205 }
 206
 207 /*
 208  * No requirements.
 209  */
 210 static int
 211 do_vmmeter(SYSCTL_HANDLER_ARGS)
 212 {
 213         int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 214         int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 215         struct vmmeter vmm;
 216         int i;
 217
 218         bzero(&vmm, sizeof(vmm));
 219         for (i = 0; i < ncpus; ++i) {
 220                 int off;
 221                 struct globaldata *gd = globaldata_find(i);
 222
 223                 for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 224                         *(u_int *)((char *)&vmm + off) +=
 225                                 *(u_int *)((char *)&gd->gd_cnt + off);
 226                 }
 227
 228         }
 229         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 230         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 231 }
 232
 233 /*
 234  * vcnt() -     accumulate statistics from the cnt structure for each cpu
 235  *
 236  *      The vmmeter structure is now per-cpu as well as global.  Those
 237  *      statistics which can be kept on a per-cpu basis (to avoid cache
 238  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
 239  *      statistics, such as v_free_reserved, are left in the global
 240  *      structure.
 241  *
 242  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
 243  *
 244  * No requirements.
 245  */
 246 static int
 247 vcnt(SYSCTL_HANDLER_ARGS)
 248 {
 249         int i;
 250         int count = 0;
 251         int offset = arg2;
 252
 253         for (i = 0; i < ncpus; ++i) {
 254                 struct globaldata *gd = globaldata_find(i);
 255                 count += *(int *)((char *)&gd->gd_cnt + offset);
 256         }
 257         return(SYSCTL_OUT(req, &count, sizeof(int)));
 258 }
 259
 260 /*
 261  * No requirements.
 262  */
 263 static int
 264 vcnt_intr(SYSCTL_HANDLER_ARGS)
 265 {
 266         int i;
 267         int count = 0;
 268
 269         for (i = 0; i < ncpus; ++i) {
 270                 struct globaldata *gd = globaldata_find(i);
 271
 272                 count += gd->gd_cnt.v_intr + gd->gd_cnt.v_ipi +
 273                          gd->gd_cnt.v_timer;
 274         }
 275         return(SYSCTL_OUT(req, &count, sizeof(int)));
 276 }
 277
 278 #define VMMETEROFF(var) offsetof(struct vmmeter, var)
 279
 280 SYSCTL_PROC(_vm, OID_AUTO, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
 281     0, sizeof(struct vmtotal), do_vmtotal, "S,vmtotal",
 282     "System virtual memory aggregate");
 283 SYSCTL_PROC(_vm, OID_AUTO, vmstats, CTLTYPE_OPAQUE|CTLFLAG_RD,
 284     0, sizeof(struct vmstats), do_vmstats, "S,vmstats",
 285     "System virtual memory statistics");
 286 SYSCTL_PROC(_vm, OID_AUTO, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
 287     0, sizeof(struct vmmeter), do_vmmeter, "S,vmmeter",
 288     "System statistics");
 289 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 290 SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
 291 SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
 292 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 293
 294 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
 295         0, VMMETEROFF(v_swtch), vcnt, "IU", "Context switches");
 296 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_coll, CTLTYPE_UINT|CTLFLAG_RD,
 297         0, VMMETEROFF(v_intrans_coll), vcnt, "IU", "Intransit map collisions (total)");
 298 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_wait, CTLTYPE_UINT|CTLFLAG_RD,
 299         0, VMMETEROFF(v_intrans_wait), vcnt, "IU", "Intransit map collisions which blocked");
 300 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_ints, CTLTYPE_UINT|CTLFLAG_RD,
 301         0, VMMETEROFF(v_forwarded_ints), vcnt, "IU", "Forwarded interrupts due to MP lock");
 302 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_hits, CTLTYPE_UINT|CTLFLAG_RD,
 303         0, VMMETEROFF(v_forwarded_hits), vcnt, "IU", "Forwarded hits due to MP lock");
 304 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_misses, CTLTYPE_UINT|CTLFLAG_RD,
 305         0, VMMETEROFF(v_forwarded_misses), vcnt, "IU", "Forwarded misses due to MP lock");
 306 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
 307         0, VMMETEROFF(v_trap), vcnt, "IU", "Traps");
 308 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
 309         0, VMMETEROFF(v_syscall), vcnt, "IU", "Syscalls");
 310 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
 311         0, VMMETEROFF(v_intr), vcnt_intr, "IU", "Hardware interrupts");
 312 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_ipi, CTLTYPE_UINT|CTLFLAG_RD,
 313         0, VMMETEROFF(v_ipi), vcnt, "IU", "Inter-processor interrupts");
 314 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_timer, CTLTYPE_UINT|CTLFLAG_RD,
 315         0, VMMETEROFF(v_timer), vcnt, "IU", "LAPIC timer interrupts");
 316 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
 317         0, VMMETEROFF(v_soft), vcnt, "IU", "Software interrupts");
 318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
 319         0, VMMETEROFF(v_vm_faults), vcnt, "IU", "VM faults");
 320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
 321         0, VMMETEROFF(v_cow_faults), vcnt, "IU", "COW faults");
 322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
 323         0, VMMETEROFF(v_cow_optim), vcnt, "IU", "Optimized COW faults");
 324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
 325         0, VMMETEROFF(v_zfod), vcnt, "IU", "Zero fill");
 326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
 327         0, VMMETEROFF(v_ozfod), vcnt, "IU", "Optimized zero fill");
 328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
 329         0, VMMETEROFF(v_swapin), vcnt, "IU", "Swapin operations");
 330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
 331         0, VMMETEROFF(v_swapout), vcnt, "IU", "Swapout operations");
 332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
 333         0, VMMETEROFF(v_swappgsin), vcnt, "IU", "Swapin pages");
 334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
 335         0, VMMETEROFF(v_swappgsout), vcnt, "IU", "Swapout pages");
 336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
 337         0, VMMETEROFF(v_vnodein), vcnt, "IU", "Vnodein operations");
 338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
 339         0, VMMETEROFF(v_vnodeout), vcnt, "IU", "Vnodeout operations");
 340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
 341         0, VMMETEROFF(v_vnodepgsin), vcnt, "IU", "Vnodein pages");
 342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
 343         0, VMMETEROFF(v_vnodepgsout), vcnt, "IU", "Vnodeout pages");
 344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
 345         0, VMMETEROFF(v_intrans), vcnt, "IU", "In transit page blocking");
 346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
 347         0, VMMETEROFF(v_reactivated), vcnt, "IU", "Reactivated pages");
 348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 349         0, VMMETEROFF(v_pdwakeups), vcnt, "IU", "Pagedaemon wakeups");
 350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ppwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 351         0, VMMETEROFF(v_ppwakeups), vcnt, "IU", "vm_wait wakeups");
 352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
 353         0, VMMETEROFF(v_pdpages), vcnt, "IU", "Pagedaemon page scans");
 354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
 355         0, VMMETEROFF(v_dfree), vcnt, "IU", "Pages freed by daemon");
 356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
 357         0, VMMETEROFF(v_pfree), vcnt, "IU", "Pages freed by exiting processes");
 358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
 359         0, VMMETEROFF(v_tfree), vcnt, "IU", "Total pages freed");
 360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
 361         0, VMMETEROFF(v_forks), vcnt, "IU", "Number of fork() calls");
 362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
 363         0, VMMETEROFF(v_vforks), vcnt, "IU", "Number of vfork() calls");
 364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
 365         0, VMMETEROFF(v_rforks), vcnt, "IU", "Number of rfork() calls");
 366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
 367         0, VMMETEROFF(v_kthreads), vcnt, "IU", "Number of fork() calls by kernel");
 368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
 369         0, VMMETEROFF(v_forkpages), vcnt, "IU", "VM pages affected by fork()");
 370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 371         0, VMMETEROFF(v_vforkpages), vcnt, "IU", "VM pages affected by vfork()");
 372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 373         0, VMMETEROFF(v_rforkpages), vcnt, "IU", "VM pages affected by rfork()");
 374 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
 375         0, VMMETEROFF(v_kthreadpages), vcnt, "IU", "VM pages affected by fork() by kernel");
 376
 377 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 378         v_page_size, CTLFLAG_RD, &vmstats.v_page_size, 0,
 379         "Page size in bytes");
 380 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 381         v_page_count, CTLFLAG_RD, &vmstats.v_page_count, 0,
 382         "Total number of pages in system");
 383 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 384         v_free_reserved, CTLFLAG_RD, &vmstats.v_free_reserved, 0,
 385         "Number of pages reserved for deadlock");
 386 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 387         v_free_target, CTLFLAG_RD, &vmstats.v_free_target, 0,
 388         "Number of pages desired free");
 389 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 390         v_free_min, CTLFLAG_RD, &vmstats.v_free_min, 0,
 391         "Minimum number of pages desired free");
 392 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 393         v_free_count, CTLFLAG_RD, &vmstats.v_free_count, 0,
 394         "Number of pages free");
 395 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 396         v_wire_count, CTLFLAG_RD, &vmstats.v_wire_count, 0,
 397         "Number of pages wired down");
 398 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 399         v_active_count, CTLFLAG_RD, &vmstats.v_active_count, 0,
 400         "Number of pages active");
 401 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 402         v_inactive_target, CTLFLAG_RD, &vmstats.v_inactive_target, 0,
 403         "Number of pages desired inactive");
 404 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 405         v_inactive_count, CTLFLAG_RD, &vmstats.v_inactive_count, 0,
 406         "Number of pages inactive");
 407 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 408         v_cache_count, CTLFLAG_RD, &vmstats.v_cache_count, 0,
 409         "Number of pages on buffer cache queue");
 410 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 411         v_cache_min, CTLFLAG_RD, &vmstats.v_cache_min, 0,
 412         "Min number of pages desired on cache queue");
 413 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 414         v_cache_max, CTLFLAG_RD, &vmstats.v_cache_max, 0,
 415         "Max number of pages in cached obj");
 416 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 417         v_pageout_free_min, CTLFLAG_RD, &vmstats.v_pageout_free_min, 0,
 418         "Min number pages reserved for kernel");
 419 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 420         v_interrupt_free_min, CTLFLAG_RD, &vmstats.v_interrupt_free_min, 0,
 421         "Reserved number of pages for int code");
 422
 423 /*
 424  * No requirements.
 425  */
 426 static int
 427 do_vmmeter_pcpu(SYSCTL_HANDLER_ARGS)
 428 {
 429         int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 430         int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 431         struct globaldata *gd = arg1;
 432         struct vmmeter vmm;
 433         int off;
 434
 435         bzero(&vmm, sizeof(vmm));
 436         for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 437                 *(u_int *)((char *)&vmm + off) +=
 438                         *(u_int *)((char *)&gd->gd_cnt + off);
 439         }
 440         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 441         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 442 }
 443
 444 /*
 445  * Called from the low level boot code only.
 446  */
 447 static void
 448 vmmeter_init(void *dummy __unused)
 449 {
 450         int i;
 451
 452         for (i = 0; i < ncpus; ++i) {
 453                 struct sysctl_ctx_list *ctx;
 454                 struct sysctl_oid *oid;
 455                 struct globaldata *gd;
 456                 char name[32];
 457
 458                 ksnprintf(name, sizeof(name), "cpu%d", i);
 459
 460                 ctx = kmalloc(sizeof(*ctx), M_TEMP, M_WAITOK);
 461                 sysctl_ctx_init(ctx);
 462                 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(_vm),
 463                                       OID_AUTO, name, CTLFLAG_RD, 0, "");
 464
 465                 gd = globaldata_find(i);
 466                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
 467                                 "vmmeter", CTLTYPE_OPAQUE|CTLFLAG_RD,
 468                                 gd, sizeof(struct vmmeter), do_vmmeter_pcpu,
 469                                 "S,vmmeter", "System per-cpu statistics");
 470         }
 471 }
 472 SYSINIT(vmmeter, SI_SUB_PSEUDO, SI_ORDER_ANY, vmmeter_init, 0);
 473
 474 /*
 475  * Rolls up accumulated pcpu adjustments to vmstats counts into the global
 476  * structure, copy the global structure into our pcpu structure.  Critical
 477  * path checks will use our pcpu structure.
 478  *
 479  * This is somewhat expensive and only called when needed, and by the
 480  * hardclock.
 481  */
 482 void
 483 vmstats_rollup(void)
 484 {
 485         int cpu;
 486
 487         for (cpu = 0; cpu < ncpus; ++cpu) {
 488                 vmstats_rollup_cpu(globaldata_find(cpu));
 489         }
 490         mycpu->gd_vmstats = vmstats;
 491 }
 492
 493 void
 494 vmstats_rollup_cpu(globaldata_t gd)
 495 {
 496         int value;
 497
 498         if (gd->gd_vmstats_adj.v_free_count) {
 499                 value = atomic_swap_int(&gd->gd_vmstats_adj.v_free_count, 0);
 500                 atomic_add_int(&vmstats.v_free_count, value);
 501         }
 502         if (gd->gd_vmstats_adj.v_cache_count) {
 503                 value = atomic_swap_int(&gd->gd_vmstats_adj.v_cache_count, 0);
 504                 atomic_add_int(&vmstats.v_cache_count, value);
 505         }
 506         if (gd->gd_vmstats_adj.v_inactive_count) {
 507                 value =atomic_swap_int(&gd->gd_vmstats_adj.v_inactive_count, 0);
 508                 atomic_add_int(&vmstats.v_inactive_count, value);
 509         }
 510         if (gd->gd_vmstats_adj.v_active_count) {
 511                 value = atomic_swap_int(&gd->gd_vmstats_adj.v_active_count, 0);
 512                 atomic_add_int(&vmstats.v_active_count, value);
 513         }
 514         if (gd->gd_vmstats_adj.v_wire_count) {
 515                 value = atomic_swap_int(&gd->gd_vmstats_adj.v_wire_count, 0);
 516                 atomic_add_int(&vmstats.v_wire_count, value);
 517         }
 518 }