sys/vm/vm_meter.c

   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. 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 "opt_compat.h"
  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/pmap.h>
  55 #include <vm/vm_map.h>
  56 #include <vm/vm_object.h>
  57 #include <sys/sysctl.h>
  58
  59 struct vmmeter __exclusive_cache_line vm_cnt = {
  60         .v_swtch = EARLY_COUNTER,
  61         .v_trap = EARLY_COUNTER,
  62         .v_syscall = EARLY_COUNTER,
  63         .v_intr = EARLY_COUNTER,
  64         .v_soft = EARLY_COUNTER,
  65         .v_vm_faults = EARLY_COUNTER,
  66         .v_io_faults = EARLY_COUNTER,
  67         .v_cow_faults = EARLY_COUNTER,
  68         .v_cow_optim = EARLY_COUNTER,
  69         .v_zfod = EARLY_COUNTER,
  70         .v_ozfod = EARLY_COUNTER,
  71         .v_swapin = EARLY_COUNTER,
  72         .v_swapout = EARLY_COUNTER,
  73         .v_swappgsin = EARLY_COUNTER,
  74         .v_swappgsout = EARLY_COUNTER,
  75         .v_vnodein = EARLY_COUNTER,
  76         .v_vnodeout = EARLY_COUNTER,
  77         .v_vnodepgsin = EARLY_COUNTER,
  78         .v_vnodepgsout = EARLY_COUNTER,
  79         .v_intrans = EARLY_COUNTER,
  80         .v_reactivated = EARLY_COUNTER,
  81         .v_pdwakeups = EARLY_COUNTER,
  82         .v_pdpages = EARLY_COUNTER,
  83         .v_pdshortfalls = EARLY_COUNTER,
  84         .v_dfree = EARLY_COUNTER,
  85         .v_pfree = EARLY_COUNTER,
  86         .v_tfree = EARLY_COUNTER,
  87         .v_forks = EARLY_COUNTER,
  88         .v_vforks = EARLY_COUNTER,
  89         .v_rforks = EARLY_COUNTER,
  90         .v_kthreads = EARLY_COUNTER,
  91         .v_forkpages = EARLY_COUNTER,
  92         .v_vforkpages = EARLY_COUNTER,
  93         .v_rforkpages = EARLY_COUNTER,
  94         .v_kthreadpages = EARLY_COUNTER,
  95 };
  96
  97 static void
  98 vmcounter_startup(void)
  99 {
 100         counter_u64_t *cnt = (counter_u64_t *)&vm_cnt;
 101
 102         COUNTER_ARRAY_ALLOC(cnt, VM_METER_NCOUNTERS, M_WAITOK);
 103 }
 104 SYSINIT(counter, SI_SUB_CPU, SI_ORDER_FOURTH + 1, vmcounter_startup, NULL);
 105
 106 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
 107         CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
 108 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
 109         CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
 110 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
 111         CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
 112 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
 113         CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
 114 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
 115         CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
 116 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
 117         CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
 118
 119 static int
 120 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
 121 {
 122
 123 #ifdef SCTL_MASK32
 124         u_int32_t la[4];
 125
 126         if (req->flags & SCTL_MASK32) {
 127                 la[0] = averunnable.ldavg[0];
 128                 la[1] = averunnable.ldavg[1];
 129                 la[2] = averunnable.ldavg[2];
 130                 la[3] = averunnable.fscale;
 131                 return SYSCTL_OUT(req, la, sizeof(la));
 132         } else
 133 #endif
 134                 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
 135 }
 136 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
 137     CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
 138     "Machine loadaverage history");
 139
 140 /*
 141  * This function aims to determine if the object is mapped,
 142  * specifically, if it is referenced by a vm_map_entry.  Because
 143  * objects occasionally acquire transient references that do not
 144  * represent a mapping, the method used here is inexact.  However, it
 145  * has very low overhead and is good enough for the advisory
 146  * vm.vmtotal sysctl.
 147  */
 148 static bool
 149 is_object_active(vm_object_t obj)
 150 {
 151
 152         return (obj->ref_count > obj->shadow_count);
 153 }
 154
 155 #if defined(COMPAT_FREEBSD11)
 156 struct vmtotal11 {
 157         int16_t t_rq;
 158         int16_t t_dw;
 159         int16_t t_pw;
 160         int16_t t_sl;
 161         int16_t t_sw;
 162         int32_t t_vm;
 163         int32_t t_avm;
 164         int32_t t_rm;
 165         int32_t t_arm;
 166         int32_t t_vmshr;
 167         int32_t t_avmshr;
 168         int32_t t_rmshr;
 169         int32_t t_armshr;
 170         int32_t t_free;
 171 };
 172 #endif
 173
 174 static int
 175 vmtotal(SYSCTL_HANDLER_ARGS)
 176 {
 177         struct vmtotal total;
 178 #if defined(COMPAT_FREEBSD11)
 179         struct vmtotal11 total11;
 180 #endif
 181         vm_object_t object;
 182         struct proc *p;
 183         struct thread *td;
 184
 185         if (req->oldptr == NULL) {
 186 #if defined(COMPAT_FREEBSD11)
 187                 if (curproc->p_osrel < P_OSREL_VMTOTAL64)
 188                         return (SYSCTL_OUT(req, NULL, sizeof(total11)));
 189 #endif
 190                 return (SYSCTL_OUT(req, NULL, sizeof(total)));
 191         }
 192         bzero(&total, sizeof(total));
 193
 194         /*
 195          * Calculate process statistics.
 196          */
 197         sx_slock(&allproc_lock);
 198         FOREACH_PROC_IN_SYSTEM(p) {
 199                 if ((p->p_flag & P_SYSTEM) != 0)
 200                         continue;
 201                 PROC_LOCK(p);
 202                 if (p->p_state != PRS_NEW) {
 203                         FOREACH_THREAD_IN_PROC(p, td) {
 204                                 thread_lock(td);
 205                                 switch (td->td_state) {
 206                                 case TDS_INHIBITED:
 207                                         if (TD_IS_SWAPPED(td))
 208                                                 total.t_sw++;
 209                                         else if (TD_IS_SLEEPING(td)) {
 210                                                 if (td->td_priority <= PZERO)
 211                                                         total.t_dw++;
 212                                                 else
 213                                                         total.t_sl++;
 214                                                 if (td->td_wchan ==
 215                                                     &vm_cnt.v_free_count)
 216                                                         total.t_pw++;
 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_free = vm_cnt.v_free_count;
 285 #if defined(COMPAT_FREEBSD11)
 286         /* sysctl(8) allocates twice as much memory as reported by sysctl(3) */
 287         if (curproc->p_osrel < P_OSREL_VMTOTAL64 && (req->oldlen ==
 288             sizeof(total11) || req->oldlen == 2 * sizeof(total11))) {
 289                 bzero(&total11, sizeof(total11));
 290                 total11.t_rq = total.t_rq;
 291                 total11.t_dw = total.t_dw;
 292                 total11.t_pw = total.t_pw;
 293                 total11.t_sl = total.t_sl;
 294                 total11.t_sw = total.t_sw;
 295                 total11.t_vm = total.t_vm;      /* truncate */
 296                 total11.t_avm = total.t_avm;    /* truncate */
 297                 total11.t_rm = total.t_rm;      /* truncate */
 298                 total11.t_arm = total.t_arm;    /* truncate */
 299                 total11.t_vmshr = total.t_vmshr;        /* truncate */
 300                 total11.t_avmshr = total.t_avmshr;      /* truncate */
 301                 total11.t_rmshr = total.t_rmshr;        /* truncate */
 302                 total11.t_armshr = total.t_armshr;      /* truncate */
 303                 total11.t_free = total.t_free;          /* truncate */
 304                 return (SYSCTL_OUT(req, &total11, sizeof(total11)));
 305         }
 306 #endif
 307         return (SYSCTL_OUT(req, &total, sizeof(total)));
 308 }
 309
 310 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE | CTLFLAG_RD |
 311     CTLFLAG_MPSAFE, NULL, 0, vmtotal, "S,vmtotal",
 312     "System virtual memory statistics");
 313 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 314 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
 315         "VM meter sys stats");
 316 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
 317         "VM meter vm stats");
 318 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 319
 320 static int
 321 sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS)
 322 {
 323         uint64_t val;
 324 #ifdef COMPAT_FREEBSD11
 325         uint32_t val32;
 326 #endif
 327
 328         val = counter_u64_fetch(*(counter_u64_t *)arg1);
 329 #ifdef COMPAT_FREEBSD11
 330         if (req->oldlen == sizeof(val32)) {
 331                 val32 = val;            /* truncate */
 332                 return (SYSCTL_OUT(req, &val32, sizeof(val32)));
 333         }
 334 #endif
 335         return (SYSCTL_OUT(req, &val, sizeof(val)));
 336 }
 337
 338 #define VM_STATS(parent, var, descr) \
 339     SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \
 340     CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr);
 341 #define VM_STATS_VM(var, descr)         VM_STATS(_vm_stats_vm, var, descr)
 342 #define VM_STATS_SYS(var, descr)        VM_STATS(_vm_stats_sys, var, descr)
 343
 344 VM_STATS_SYS(v_swtch, "Context switches");
 345 VM_STATS_SYS(v_trap, "Traps");
 346 VM_STATS_SYS(v_syscall, "System calls");
 347 VM_STATS_SYS(v_intr, "Device interrupts");
 348 VM_STATS_SYS(v_soft, "Software interrupts");
 349 VM_STATS_VM(v_vm_faults, "Address memory faults");
 350 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
 351 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
 352 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
 353 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
 354 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
 355 VM_STATS_VM(v_swapin, "Swap pager pageins");
 356 VM_STATS_VM(v_swapout, "Swap pager pageouts");
 357 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
 358 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
 359 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
 360 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
 361 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
 362 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
 363 VM_STATS_VM(v_intrans, "In transit page faults");
 364 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon");
 365 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
 366 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
 367 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls");
 368 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
 369 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
 370 VM_STATS_VM(v_tfree, "Total pages freed");
 371 VM_STATS_VM(v_forks, "Number of fork() calls");
 372 VM_STATS_VM(v_vforks, "Number of vfork() calls");
 373 VM_STATS_VM(v_rforks, "Number of rfork() calls");
 374 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
 375 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
 376 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
 377 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
 378 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
 379
 380 #define VM_STATS_UINT(var, descr)       \
 381     SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
 382 VM_STATS_UINT(v_page_size, "Page size in bytes");
 383 VM_STATS_UINT(v_page_count, "Total number of pages in system");
 384 VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock");
 385 VM_STATS_UINT(v_free_target, "Pages desired free");
 386 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold");
 387 VM_STATS_UINT(v_free_count, "Free pages");
 388 VM_STATS_UINT(v_wire_count, "Wired pages");
 389 VM_STATS_UINT(v_active_count, "Active pages");
 390 VM_STATS_UINT(v_inactive_target, "Desired inactive pages");
 391 VM_STATS_UINT(v_inactive_count, "Inactive pages");
 392 VM_STATS_UINT(v_laundry_count, "Pages eligible for laundering");
 393 VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel");
 394 VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code");
 395 VM_STATS_UINT(v_free_severe, "Severe page depletion point");
 396
 397 #ifdef COMPAT_FREEBSD11
 398 /*
 399  * Provide compatibility sysctls for the benefit of old utilities which exit
 400  * with an error if they cannot be found.
 401  */
 402 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
 403     SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
 404 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
 405     SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
 406 #endif