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  */
  34
  35 #include <sys/param.h>
  36 #include <sys/proc.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/malloc.h>
  40 #include <sys/resource.h>
  41 #include <sys/vmmeter.h>
  42 #include <sys/kcollect.h>
  43
  44 #include <vm/vm.h>
  45 #include <vm/vm_page.h>
  46 #include <vm/vm_extern.h>
  47 #include <vm/vm_param.h>
  48 #include <sys/lock.h>
  49 #include <vm/pmap.h>
  50 #include <vm/vm_map.h>
  51 #include <vm/vm_object.h>
  52 #include <sys/sysctl.h>
  53
  54 /*
  55  * WARNING: vmstats represents the final say, but individual cpu's may
  56  *          accumualte adjustments in gd->gd_vmstats_adj.  These are
  57  *          synchronized to the global vmstats in hardclock.
  58  *
  59  *          In addition, most individual cpus check vmstats using a local
  60  *          copy of the global vmstats in gd->gd_vmstats.  Hardclock also
  61  *          sychronizes the copy.  The pageout code and vm_page_alloc will
  62  *          also synchronize their local copies as necessary.
  63  *
  64  *          Other consumers should not expect perfect values.
  65  */
  66 __exclusive_cache_line struct vmstats vmstats;
  67
  68 static int maxslp = MAXSLP;
  69
  70 SYSCTL_ULONG(_vm, VM_V_FREE_MIN, v_free_min,
  71         CTLFLAG_RW, &vmstats.v_free_min, 0,
  72         "Minimum number of pages desired free");
  73 SYSCTL_ULONG(_vm, VM_V_PAGING_WAIT, v_paging_wait,
  74         CTLFLAG_RW, &vmstats.v_paging_wait, 0,
  75         "Userland slows down allocations");
  76 SYSCTL_ULONG(_vm, VM_V_PAGING_START, v_paging_start,
  77         CTLFLAG_RW, &vmstats.v_paging_start, 0,
  78         "Pageout daemon begins running");
  79 SYSCTL_ULONG(_vm, VM_V_PAGING_TARGET1, v_paging_target1,
  80         CTLFLAG_RW, &vmstats.v_paging_target1, 0,
  81         "Mid pageout daemon target");
  82 SYSCTL_ULONG(_vm, VM_V_PAGING_TARGET2, v_paging_target2,
  83         CTLFLAG_RW, &vmstats.v_paging_target2, 0,
  84         "Final pageout daemon target");
  85 SYSCTL_ULONG(_vm, VM_V_FREE_RESERVED, v_free_reserved,
  86         CTLFLAG_RW, &vmstats.v_free_reserved, 0,
  87         "Number of pages reserved for deadlock");
  88 SYSCTL_ULONG(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
  89         CTLFLAG_RW, &vmstats.v_inactive_target, 0,
  90         "Maximum inactive pages during pageout");
  91 SYSCTL_ULONG(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
  92         CTLFLAG_RW, &vmstats.v_pageout_free_min, 0,
  93         "Min number pages reserved for kernel");
  94 SYSCTL_ULONG(_vm, OID_AUTO, v_free_severe,
  95         CTLFLAG_RW, &vmstats.v_free_severe, 0, "");
  96
  97 SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg,
  98         CTLFLAG_RD | CTLFLAG_NOLOCK,
  99         &averunnable, loadavg, "Machine loadaverage history");
 100
 101 static int do_vmtotal_callback(struct proc *p, void *data);
 102
 103 /*
 104  * No requirements.
 105  */
 106 static int
 107 do_vmtotal(SYSCTL_HANDLER_ARGS)
 108 {
 109         struct vmtotal total;
 110         globaldata_t gd;
 111         int n;
 112
 113         bzero(&total, sizeof(total));
 114         for (n = 0; n < ncpus; ++n) {
 115                 gd = globaldata_find(n);
 116
 117                 /* total.t_rq calculated separately */
 118                 /* total.t_dw calculated separately */
 119                 /* total.t_pw calculated separately */
 120                 /* total.t_sl calculated separately */
 121                 /* total.t_sw calculated separately */
 122                 total.t_vm += gd->gd_vmtotal.t_vm;
 123                 total.t_avm += gd->gd_vmtotal.t_avm;
 124                 total.t_rm += gd->gd_vmtotal.t_rm;
 125                 total.t_arm += gd->gd_vmtotal.t_arm;
 126                 total.t_vmshr += gd->gd_vmtotal.t_vmshr;
 127                 total.t_avmshr += gd->gd_vmtotal.t_avmshr;
 128                 total.t_rmshr += gd->gd_vmtotal.t_rmshr;
 129                 total.t_armshr += gd->gd_vmtotal.t_armshr;
 130                 /* total.t_free calculated separately */
 131         }
 132
 133         /*
 134          * Calculate process statistics.
 135          */
 136         allproc_scan(do_vmtotal_callback, &total, 0);
 137
 138         /*
 139          * Adjust for sysctl return.  Add real memory into virtual memory.
 140          * Set t_free.
 141          *
 142          * t_rm - Real memory
 143          * t_vm - Virtual memory (real + swap)
 144          */
 145         total.t_vm += total.t_rm;
 146         total.t_free = vmstats.v_free_count + vmstats.v_cache_count;
 147
 148         return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
 149 }
 150
 151 static int
 152 do_vmtotal_callback(struct proc *p, void *data)
 153 {
 154         struct vmtotal *totalp = data;
 155         struct lwp *lp;
 156
 157         if (p->p_flags & P_SYSTEM)
 158                 return(0);
 159
 160         lwkt_gettoken_shared(&p->p_token);
 161
 162         FOREACH_LWP_IN_PROC(lp, p) {
 163                 switch (lp->lwp_stat) {
 164                 case LSSTOP:
 165                 case LSSLEEP:
 166                         if ((lp->lwp_flags & LWP_SINTR) == 0)
 167                                 totalp->t_dw++;
 168                         else if (lp->lwp_slptime < maxslp)
 169                                 totalp->t_sl++;
 170                         if (lp->lwp_slptime >= maxslp)
 171                                 goto out;
 172                         break;
 173                 case LSRUN:
 174                         totalp->t_rq++;
 175                         if (p->p_stat == SIDL)
 176                                 goto out;
 177                         break;
 178                 default:
 179                         goto out;
 180                 }
 181
 182                 /*
 183                  * Set while in vm_fault()
 184                  */
 185                 if (lp->lwp_flags & LWP_PAGING)
 186                         totalp->t_pw++;
 187         }
 188 out:
 189         lwkt_reltoken(&p->p_token);
 190         return(0);
 191 }
 192
 193 /*
 194  * No requirements.
 195  */
 196 static int
 197 do_vmstats(SYSCTL_HANDLER_ARGS)
 198 {
 199         struct vmstats vms = vmstats;
 200         return (sysctl_handle_opaque(oidp, &vms, sizeof(vms), req));
 201 }
 202
 203 /*
 204  * No requirements.
 205  */
 206 static int
 207 do_vmmeter(SYSCTL_HANDLER_ARGS)
 208 {
 209         int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 210         int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 211         struct vmmeter vmm;
 212         int i;
 213
 214         bzero(&vmm, sizeof(vmm));
 215         for (i = 0; i < ncpus; ++i) {
 216                 int off;
 217                 struct globaldata *gd = globaldata_find(i);
 218
 219                 for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 220                         *(u_int *)((char *)&vmm + off) +=
 221                                 *(u_int *)((char *)&gd->gd_cnt + off);
 222                 }
 223
 224         }
 225         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 226         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 227 }
 228
 229 /*
 230  * vcnt() -     accumulate statistics from the cnt structure for each cpu
 231  *
 232  *      The vmmeter structure is now per-cpu as well as global.  Those
 233  *      statistics which can be kept on a per-cpu basis (to avoid cache
 234  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
 235  *      statistics, such as v_free_reserved, are left in the global
 236  *      structure.
 237  *
 238  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
 239  *
 240  * No requirements.
 241  */
 242 static int
 243 vcnt(SYSCTL_HANDLER_ARGS)
 244 {
 245         int i;
 246         int count = 0;
 247         int offset = arg2;
 248
 249         for (i = 0; i < ncpus; ++i) {
 250                 struct globaldata *gd = globaldata_find(i);
 251                 count += *(int *)((char *)&gd->gd_cnt + offset);
 252         }
 253         return(SYSCTL_OUT(req, &count, sizeof(int)));
 254 }
 255
 256 /*
 257  * No requirements.
 258  */
 259 static int
 260 vcnt_intr(SYSCTL_HANDLER_ARGS)
 261 {
 262         int i;
 263         int count = 0;
 264
 265         for (i = 0; i < ncpus; ++i) {
 266                 struct globaldata *gd = globaldata_find(i);
 267
 268                 count += gd->gd_cnt.v_intr + gd->gd_cnt.v_ipi +
 269                          gd->gd_cnt.v_timer;
 270         }
 271         return(SYSCTL_OUT(req, &count, sizeof(int)));
 272 }
 273
 274 #define VMMETEROFF(var) offsetof(struct vmmeter, var)
 275
 276 SYSCTL_PROC(_vm, OID_AUTO, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
 277     0, sizeof(struct vmtotal), do_vmtotal, "S,vmtotal",
 278     "System virtual memory aggregate");
 279 SYSCTL_PROC(_vm, OID_AUTO, vmstats, CTLTYPE_OPAQUE|CTLFLAG_RD,
 280     0, sizeof(struct vmstats), do_vmstats, "S,vmstats",
 281     "System virtual memory statistics");
 282 SYSCTL_PROC(_vm, OID_AUTO, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
 283     0, sizeof(struct vmmeter), do_vmmeter, "S,vmmeter",
 284     "System statistics");
 285 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 286 SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
 287 SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
 288 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 289
 290 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
 291         0, VMMETEROFF(v_swtch), vcnt, "IU", "Context switches");
 292 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_coll, CTLTYPE_UINT|CTLFLAG_RD,
 293         0, VMMETEROFF(v_intrans_coll), vcnt, "IU", "Intransit map collisions (total)");
 294 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_wait, CTLTYPE_UINT|CTLFLAG_RD,
 295         0, VMMETEROFF(v_intrans_wait), vcnt, "IU", "Intransit map collisions which blocked");
 296 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_ints, CTLTYPE_UINT|CTLFLAG_RD,
 297         0, VMMETEROFF(v_forwarded_ints), vcnt, "IU", "Forwarded interrupts due to MP lock");
 298 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_hits, CTLTYPE_UINT|CTLFLAG_RD,
 299         0, VMMETEROFF(v_forwarded_hits), vcnt, "IU", "Forwarded hits due to MP lock");
 300 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_misses, CTLTYPE_UINT|CTLFLAG_RD,
 301         0, VMMETEROFF(v_forwarded_misses), vcnt, "IU", "Forwarded misses due to MP lock");
 302 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
 303         0, VMMETEROFF(v_trap), vcnt, "IU", "Traps");
 304 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
 305         0, VMMETEROFF(v_syscall), vcnt, "IU", "Syscalls");
 306 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
 307         0, VMMETEROFF(v_intr), vcnt_intr, "IU", "Hardware interrupts");
 308 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_ipi, CTLTYPE_UINT|CTLFLAG_RD,
 309         0, VMMETEROFF(v_ipi), vcnt, "IU", "Inter-processor interrupts");
 310 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_timer, CTLTYPE_UINT|CTLFLAG_RD,
 311         0, VMMETEROFF(v_timer), vcnt, "IU", "LAPIC timer interrupts");
 312 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
 313         0, VMMETEROFF(v_soft), vcnt, "IU", "Software interrupts");
 314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
 315         0, VMMETEROFF(v_vm_faults), vcnt, "IU", "VM faults");
 316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
 317         0, VMMETEROFF(v_cow_faults), vcnt, "IU", "COW faults");
 318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
 319         0, VMMETEROFF(v_cow_optim), vcnt, "IU", "Optimized COW faults");
 320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
 321         0, VMMETEROFF(v_zfod), vcnt, "IU", "Zero fill");
 322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
 323         0, VMMETEROFF(v_ozfod), vcnt, "IU", "Optimized zero fill");
 324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
 325         0, VMMETEROFF(v_swapin), vcnt, "IU", "Swapin operations");
 326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
 327         0, VMMETEROFF(v_swapout), vcnt, "IU", "Swapout operations");
 328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
 329         0, VMMETEROFF(v_swappgsin), vcnt, "IU", "Swapin pages");
 330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
 331         0, VMMETEROFF(v_swappgsout), vcnt, "IU", "Swapout pages");
 332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
 333         0, VMMETEROFF(v_vnodein), vcnt, "IU", "Vnodein operations");
 334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
 335         0, VMMETEROFF(v_vnodeout), vcnt, "IU", "Vnodeout operations");
 336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
 337         0, VMMETEROFF(v_vnodepgsin), vcnt, "IU", "Vnodein pages");
 338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
 339         0, VMMETEROFF(v_vnodepgsout), vcnt, "IU", "Vnodeout pages");
 340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
 341         0, VMMETEROFF(v_intrans), vcnt, "IU", "In transit page blocking");
 342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
 343         0, VMMETEROFF(v_reactivated), vcnt, "IU", "Reactivated pages");
 344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 345         0, VMMETEROFF(v_pdwakeups), vcnt, "IU", "Pagedaemon wakeups");
 346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ppwakeups, CTLTYPE_UINT|CTLFLAG_RD,
 347         0, VMMETEROFF(v_ppwakeups), vcnt, "IU", "vm_wait wakeups");
 348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
 349         0, VMMETEROFF(v_pdpages), vcnt, "IU", "Pagedaemon page scans");
 350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
 351         0, VMMETEROFF(v_dfree), vcnt, "IU", "Pages freed by daemon");
 352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
 353         0, VMMETEROFF(v_pfree), vcnt, "IU", "Pages freed by exiting processes");
 354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
 355         0, VMMETEROFF(v_tfree), vcnt, "IU", "Total pages freed");
 356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
 357         0, VMMETEROFF(v_forks), vcnt, "IU", "Number of fork() calls");
 358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
 359         0, VMMETEROFF(v_vforks), vcnt, "IU", "Number of vfork() calls");
 360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
 361         0, VMMETEROFF(v_rforks), vcnt, "IU", "Number of rfork() calls");
 362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
 363         0, VMMETEROFF(v_kthreads), vcnt, "IU", "Number of fork() calls by kernel");
 364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
 365         0, VMMETEROFF(v_forkpages), vcnt, "IU", "VM pages affected by fork()");
 366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 367         0, VMMETEROFF(v_vforkpages), vcnt, "IU", "VM pages affected by vfork()");
 368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
 369         0, VMMETEROFF(v_rforkpages), vcnt, "IU", "VM pages affected by rfork()");
 370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
 371         0, VMMETEROFF(v_kthreadpages), vcnt, "IU", "VM pages affected by fork() by kernel");
 372
 373 SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
 374         v_page_size, CTLFLAG_RD, &vmstats.v_page_size, 0,
 375         "Page size in bytes");
 376 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 377         v_page_count, CTLFLAG_RD, &vmstats.v_page_count, 0,
 378         "Total number of pages in system");
 379 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 380         v_free_reserved, CTLFLAG_RD, &vmstats.v_free_reserved, 0,
 381         "Number of pages reserved for deadlock");
 382 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 383         v_free_min, CTLFLAG_RD, &vmstats.v_free_min, 0,
 384         "Minimum number of pages desired free");
 385 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 386         v_paging_wait, CTLFLAG_RW, &vmstats.v_paging_wait, 0,
 387         "Userland slows down allocations");
 388 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 389         v_paging_start, CTLFLAG_RW, &vmstats.v_paging_start, 0,
 390         "Pageout daemon begins running");
 391 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 392         v_paging_target1, CTLFLAG_RW, &vmstats.v_paging_target1, 0,
 393         "Mid pageout daemon target");
 394 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 395         v_paging_target2, CTLFLAG_RW, &vmstats.v_paging_target2, 0,
 396         "Final pageout daemon target");
 397 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 398         v_free_count, CTLFLAG_RD, &vmstats.v_free_count, 0,
 399         "Number of pages free");
 400 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 401         v_wire_count, CTLFLAG_RD, &vmstats.v_wire_count, 0,
 402         "Number of pages wired down");
 403 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 404         v_active_count, CTLFLAG_RD, &vmstats.v_active_count, 0,
 405         "Number of pages active");
 406 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 407         v_inactive_target, CTLFLAG_RD, &vmstats.v_inactive_target, 0,
 408         "Maximum inactive pages during pageout");
 409 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 410         v_inactive_count, CTLFLAG_RD, &vmstats.v_inactive_count, 0,
 411         "Number of pages inactive");
 412 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 413         v_cache_count, CTLFLAG_RD, &vmstats.v_cache_count, 0,
 414         "Number of pages on buffer cache queue");
 415 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 416         v_pageout_free_min, CTLFLAG_RD, &vmstats.v_pageout_free_min, 0,
 417         "Min number pages reserved for kernel");
 418 SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
 419         v_interrupt_free_min, CTLFLAG_RD, &vmstats.v_interrupt_free_min, 0,
 420         "Reserved number of pages for int code");
 421
 422 /*
 423  * Callback for per-cpu vmmeter structure.  Unlike the global structure,
 424  * we don't have to aggregate anything.
 425  *
 426  * No requirements.
 427  */
 428 static int
 429 do_vmmeter_pcpu(SYSCTL_HANDLER_ARGS)
 430 {
 431         struct globaldata *gd = arg1;
 432         struct vmmeter vmm;
 433
 434         vmm = gd->gd_cnt;
 435         vmm.v_intr += vmm.v_ipi + vmm.v_timer;
 436         return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
 437 }
 438
 439 /*
 440  * Callback for long-term slow data collection on 10-second interval.
 441  *
 442  * Return faults, set data for other entries.
 443  */
 444 #define PTOB(value)     ((uint64_t)(value) << PAGE_SHIFT)
 445
 446 static uint64_t
 447 collect_vmstats_callback(int n)
 448 {
 449         static struct vmmeter last_vmm;
 450         struct vmmeter cur_vmm;
 451         const int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
 452         const int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
 453         uint64_t total;
 454
 455         /*
 456          * The hardclock already rolls up vmstats for us.
 457          */
 458         kcollect_setvalue(KCOLLECT_MEMFRE, PTOB(vmstats.v_free_count));
 459         kcollect_setvalue(KCOLLECT_MEMCAC, PTOB(vmstats.v_cache_count));
 460         kcollect_setvalue(KCOLLECT_MEMINA, PTOB(vmstats.v_inactive_count));
 461         kcollect_setvalue(KCOLLECT_MEMACT, PTOB(vmstats.v_active_count));
 462         kcollect_setvalue(KCOLLECT_MEMWIR, PTOB(vmstats.v_wire_count));
 463
 464         /*
 465          * Collect pcpu statistics for things like faults.
 466          */
 467         bzero(&cur_vmm, sizeof(cur_vmm));
 468         for (n = 0; n < ncpus; ++n) {
 469                 struct globaldata *gd = globaldata_find(n);
 470                 int off;
 471
 472                 for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
 473                         *(u_int *)((char *)&cur_vmm + off) +=
 474                                 *(u_int *)((char *)&gd->gd_cnt + off);
 475                 }
 476
 477         }
 478
 479         total = cur_vmm.v_cow_faults - last_vmm.v_cow_faults;
 480         last_vmm.v_cow_faults = cur_vmm.v_cow_faults;
 481         kcollect_setvalue(KCOLLECT_COWFAULT, total);
 482
 483         total = cur_vmm.v_zfod - last_vmm.v_zfod;
 484         last_vmm.v_zfod = cur_vmm.v_zfod;
 485         kcollect_setvalue(KCOLLECT_ZFILL, total);
 486
 487         total = cur_vmm.v_syscall - last_vmm.v_syscall;
 488         last_vmm.v_syscall = cur_vmm.v_syscall;
 489         kcollect_setvalue(KCOLLECT_SYSCALLS, total);
 490
 491         total = cur_vmm.v_intr - last_vmm.v_intr;
 492         last_vmm.v_intr = cur_vmm.v_intr;
 493         kcollect_setvalue(KCOLLECT_INTR, total);
 494
 495         total = cur_vmm.v_ipi - last_vmm.v_ipi;
 496         last_vmm.v_ipi = cur_vmm.v_ipi;
 497         kcollect_setvalue(KCOLLECT_IPI, total);
 498
 499         total = cur_vmm.v_timer - last_vmm.v_timer;
 500         last_vmm.v_timer = cur_vmm.v_timer;
 501         kcollect_setvalue(KCOLLECT_TIMER, total);
 502
 503         total = cur_vmm.v_vm_faults - last_vmm.v_vm_faults;
 504         last_vmm.v_vm_faults = cur_vmm.v_vm_faults;
 505
 506         return total;
 507 }
 508
 509 /*
 510  * Called from the low level boot code only.
 511  */
 512 static void
 513 vmmeter_init(void *dummy __unused)
 514 {
 515         int i;
 516
 517         for (i = 0; i < ncpus; ++i) {
 518                 struct sysctl_ctx_list *ctx;
 519                 struct sysctl_oid *oid;
 520                 struct globaldata *gd;
 521                 char name[32];
 522
 523                 ksnprintf(name, sizeof(name), "cpu%d", i);
 524
 525                 ctx = kmalloc(sizeof(*ctx), M_TEMP, M_WAITOK);
 526                 sysctl_ctx_init(ctx);
 527                 oid = SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(_vm),
 528                                       OID_AUTO, name, CTLFLAG_RD, 0, "");
 529
 530                 gd = globaldata_find(i);
 531                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
 532                                 "vmmeter", CTLTYPE_OPAQUE|CTLFLAG_RD,
 533                                 gd, sizeof(struct vmmeter), do_vmmeter_pcpu,
 534                                 "S,vmmeter", "System per-cpu statistics");
 535         }
 536         kcollect_register(KCOLLECT_VMFAULT, "fault", collect_vmstats_callback,
 537                           KCOLLECT_SCALE(KCOLLECT_VMFAULT_FORMAT, 0));
 538         kcollect_register(KCOLLECT_COWFAULT, "cow", NULL,
 539                           KCOLLECT_SCALE(KCOLLECT_COWFAULT_FORMAT, 0));
 540         kcollect_register(KCOLLECT_ZFILL, "zfill", NULL,
 541                           KCOLLECT_SCALE(KCOLLECT_ZFILL_FORMAT, 0));
 542
 543         kcollect_register(KCOLLECT_MEMFRE, "free", NULL,
 544                           KCOLLECT_SCALE(KCOLLECT_MEMFRE_FORMAT,
 545                                          PTOB(vmstats.v_page_count)));
 546         kcollect_register(KCOLLECT_MEMCAC, "cache", NULL,
 547                           KCOLLECT_SCALE(KCOLLECT_MEMCAC_FORMAT,
 548                                          PTOB(vmstats.v_page_count)));
 549         kcollect_register(KCOLLECT_MEMINA, "inact", NULL,
 550                           KCOLLECT_SCALE(KCOLLECT_MEMINA_FORMAT,
 551                                          PTOB(vmstats.v_page_count)));
 552         kcollect_register(KCOLLECT_MEMACT, "act", NULL,
 553                           KCOLLECT_SCALE(KCOLLECT_MEMACT_FORMAT,
 554                                          PTOB(vmstats.v_page_count)));
 555         kcollect_register(KCOLLECT_MEMWIR, "wired", NULL,
 556                           KCOLLECT_SCALE(KCOLLECT_MEMWIR_FORMAT,
 557                                          PTOB(vmstats.v_page_count)));
 558
 559         kcollect_register(KCOLLECT_SYSCALLS, "syscalls", NULL,
 560                           KCOLLECT_SCALE(KCOLLECT_SYSCALLS_FORMAT, 0));
 561
 562         kcollect_register(KCOLLECT_INTR, "intr", NULL,
 563                           KCOLLECT_SCALE(KCOLLECT_INTR_FORMAT, 0));
 564         kcollect_register(KCOLLECT_IPI, "ipi", NULL,
 565                           KCOLLECT_SCALE(KCOLLECT_IPI_FORMAT, 0));
 566         kcollect_register(KCOLLECT_TIMER, "timer", NULL,
 567                           KCOLLECT_SCALE(KCOLLECT_TIMER_FORMAT, 0));
 568 }
 569 SYSINIT(vmmeter, SI_SUB_PSEUDO, SI_ORDER_ANY, vmmeter_init, 0);
 570
 571 /*
 572  * Rolls up accumulated pcpu adjustments to vmstats counts into the global
 573  * structure, copy the global structure into our pcpu structure.  Critical
 574  * path checks will use our pcpu structure.
 575  *
 576  * This is somewhat expensive and only called when needed, and by the
 577  * hardclock.
 578  */
 579 void
 580 vmstats_rollup(void)
 581 {
 582         int cpu;
 583
 584         for (cpu = 0; cpu < ncpus; ++cpu) {
 585                 vmstats_rollup_cpu(globaldata_find(cpu));
 586         }
 587         mycpu->gd_vmstats = vmstats;
 588 }
 589
 590 void
 591 vmstats_rollup_cpu(globaldata_t gd)
 592 {
 593         long value;
 594
 595         if (gd->gd_vmstats_adj.v_free_count) {
 596                 value = atomic_swap_long(&gd->gd_vmstats_adj.v_free_count, 0);
 597                 atomic_add_long(&vmstats.v_free_count, value);
 598         }
 599         if (gd->gd_vmstats_adj.v_cache_count) {
 600                 value = atomic_swap_long(&gd->gd_vmstats_adj.v_cache_count, 0);
 601                 atomic_add_long(&vmstats.v_cache_count, value);
 602         }
 603         if (gd->gd_vmstats_adj.v_inactive_count) {
 604                 value=atomic_swap_long(&gd->gd_vmstats_adj.v_inactive_count, 0);
 605                 atomic_add_long(&vmstats.v_inactive_count, value);
 606         }
 607         if (gd->gd_vmstats_adj.v_active_count) {
 608                 value = atomic_swap_long(&gd->gd_vmstats_adj.v_active_count, 0);
 609                 atomic_add_long(&vmstats.v_active_count, value);
 610         }
 611         if (gd->gd_vmstats_adj.v_wire_count) {
 612                 value = atomic_swap_long(&gd->gd_vmstats_adj.v_wire_count, 0);
 613                 atomic_add_long(&vmstats.v_wire_count, value);
 614         }
 615 }