1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_compat.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mutex.h> 45 #include <sys/proc.h> 46 #include <sys/resource.h> 47 #include <sys/rwlock.h> 48 #include <sys/sx.h> 49 #include <sys/vmmeter.h> 50 #include <sys/smp.h> 51 52 #include <vm/vm.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_extern.h> 55 #include <vm/vm_param.h> 56 #include <vm/vm_phys.h> 57 #include <vm/vm_pagequeue.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_map.h> 60 #include <vm/vm_object.h> 61 #include <sys/sysctl.h> 62 63 struct vmmeter __exclusive_cache_line vm_cnt = { 64 .v_swtch = EARLY_COUNTER, 65 .v_trap = EARLY_COUNTER, 66 .v_syscall = EARLY_COUNTER, 67 .v_intr = EARLY_COUNTER, 68 .v_soft = EARLY_COUNTER, 69 .v_vm_faults = EARLY_COUNTER, 70 .v_io_faults = EARLY_COUNTER, 71 .v_cow_faults = EARLY_COUNTER, 72 .v_cow_optim = EARLY_COUNTER, 73 .v_zfod = EARLY_COUNTER, 74 .v_ozfod = EARLY_COUNTER, 75 .v_swapin = EARLY_COUNTER, 76 .v_swapout = EARLY_COUNTER, 77 .v_swappgsin = EARLY_COUNTER, 78 .v_swappgsout = EARLY_COUNTER, 79 .v_vnodein = EARLY_COUNTER, 80 .v_vnodeout = EARLY_COUNTER, 81 .v_vnodepgsin = EARLY_COUNTER, 82 .v_vnodepgsout = EARLY_COUNTER, 83 .v_intrans = EARLY_COUNTER, 84 .v_reactivated = EARLY_COUNTER, 85 .v_pdwakeups = EARLY_COUNTER, 86 .v_pdpages = EARLY_COUNTER, 87 .v_pdshortfalls = EARLY_COUNTER, 88 .v_dfree = EARLY_COUNTER, 89 .v_pfree = EARLY_COUNTER, 90 .v_tfree = EARLY_COUNTER, 91 .v_forks = EARLY_COUNTER, 92 .v_vforks = EARLY_COUNTER, 93 .v_rforks = EARLY_COUNTER, 94 .v_kthreads = EARLY_COUNTER, 95 .v_forkpages = EARLY_COUNTER, 96 .v_vforkpages = EARLY_COUNTER, 97 .v_rforkpages = EARLY_COUNTER, 98 .v_kthreadpages = EARLY_COUNTER, 99 }; 100 101 static void 102 vmcounter_startup(void) 103 { 104 counter_u64_t *cnt = (counter_u64_t *)&vm_cnt; 105 106 COUNTER_ARRAY_ALLOC(cnt, VM_METER_NCOUNTERS, M_WAITOK); 107 } 108 SYSINIT(counter, SI_SUB_CPU, SI_ORDER_FOURTH + 1, vmcounter_startup, NULL); 109 110 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 111 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 112 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 113 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages"); 114 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 115 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 116 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 117 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive"); 118 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 119 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 120 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 121 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 122 123 static int 124 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 125 { 126 127 #ifdef SCTL_MASK32 128 u_int32_t la[4]; 129 130 if (req->flags & SCTL_MASK32) { 131 la[0] = averunnable.ldavg[0]; 132 la[1] = averunnable.ldavg[1]; 133 la[2] = averunnable.ldavg[2]; 134 la[3] = averunnable.fscale; 135 return SYSCTL_OUT(req, la, sizeof(la)); 136 } else 137 #endif 138 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 139 } 140 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 141 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 142 "Machine loadaverage history"); 143 144 /* 145 * This function aims to determine if the object is mapped, 146 * specifically, if it is referenced by a vm_map_entry. Because 147 * objects occasionally acquire transient references that do not 148 * represent a mapping, the method used here is inexact. However, it 149 * has very low overhead and is good enough for the advisory 150 * vm.vmtotal sysctl. 151 */ 152 static bool 153 is_object_active(vm_object_t obj) 154 { 155 156 return (obj->ref_count > obj->shadow_count); 157 } 158 159 #if defined(COMPAT_FREEBSD11) 160 struct vmtotal11 { 161 int16_t t_rq; 162 int16_t t_dw; 163 int16_t t_pw; 164 int16_t t_sl; 165 int16_t t_sw; 166 int32_t t_vm; 167 int32_t t_avm; 168 int32_t t_rm; 169 int32_t t_arm; 170 int32_t t_vmshr; 171 int32_t t_avmshr; 172 int32_t t_rmshr; 173 int32_t t_armshr; 174 int32_t t_free; 175 }; 176 #endif 177 178 static int 179 vmtotal(SYSCTL_HANDLER_ARGS) 180 { 181 struct vmtotal total; 182 #if defined(COMPAT_FREEBSD11) 183 struct vmtotal11 total11; 184 #endif 185 vm_object_t object; 186 struct proc *p; 187 struct thread *td; 188 189 if (req->oldptr == NULL) { 190 #if defined(COMPAT_FREEBSD11) 191 if (curproc->p_osrel < P_OSREL_VMTOTAL64) 192 return (SYSCTL_OUT(req, NULL, sizeof(total11))); 193 #endif 194 return (SYSCTL_OUT(req, NULL, sizeof(total))); 195 } 196 bzero(&total, sizeof(total)); 197 198 /* 199 * Calculate process statistics. 200 */ 201 sx_slock(&allproc_lock); 202 FOREACH_PROC_IN_SYSTEM(p) { 203 if ((p->p_flag & P_SYSTEM) != 0) 204 continue; 205 PROC_LOCK(p); 206 if (p->p_state != PRS_NEW) { 207 FOREACH_THREAD_IN_PROC(p, td) { 208 thread_lock(td); 209 switch (td->td_state) { 210 case TDS_INHIBITED: 211 if (TD_IS_SWAPPED(td)) 212 total.t_sw++; 213 else if (TD_IS_SLEEPING(td)) { 214 if (td->td_priority <= PZERO) 215 total.t_dw++; 216 else 217 total.t_sl++; 218 } 219 break; 220 case TDS_CAN_RUN: 221 total.t_sw++; 222 break; 223 case TDS_RUNQ: 224 case TDS_RUNNING: 225 total.t_rq++; 226 break; 227 default: 228 break; 229 } 230 thread_unlock(td); 231 } 232 } 233 PROC_UNLOCK(p); 234 } 235 sx_sunlock(&allproc_lock); 236 /* 237 * Calculate object memory usage statistics. 238 */ 239 mtx_lock(&vm_object_list_mtx); 240 TAILQ_FOREACH(object, &vm_object_list, object_list) { 241 /* 242 * Perform unsynchronized reads on the object. In 243 * this case, the lack of synchronization should not 244 * impair the accuracy of the reported statistics. 245 */ 246 if ((object->flags & OBJ_FICTITIOUS) != 0) { 247 /* 248 * Devices, like /dev/mem, will badly skew our totals. 249 */ 250 continue; 251 } 252 if (object->ref_count == 0) { 253 /* 254 * Also skip unreferenced objects, including 255 * vnodes representing mounted file systems. 256 */ 257 continue; 258 } 259 if (object->ref_count == 1 && 260 (object->flags & OBJ_NOSPLIT) != 0) { 261 /* 262 * Also skip otherwise unreferenced swap 263 * objects backing tmpfs vnodes, and POSIX or 264 * SysV shared memory. 265 */ 266 continue; 267 } 268 total.t_vm += object->size; 269 total.t_rm += object->resident_page_count; 270 if (is_object_active(object)) { 271 total.t_avm += object->size; 272 total.t_arm += object->resident_page_count; 273 } 274 if (object->shadow_count > 1) { 275 /* shared object */ 276 total.t_vmshr += object->size; 277 total.t_rmshr += object->resident_page_count; 278 if (is_object_active(object)) { 279 total.t_avmshr += object->size; 280 total.t_armshr += object->resident_page_count; 281 } 282 } 283 } 284 mtx_unlock(&vm_object_list_mtx); 285 total.t_pw = vm_wait_count(); 286 total.t_free = vm_free_count(); 287 #if defined(COMPAT_FREEBSD11) 288 /* sysctl(8) allocates twice as much memory as reported by sysctl(3) */ 289 if (curproc->p_osrel < P_OSREL_VMTOTAL64 && (req->oldlen == 290 sizeof(total11) || req->oldlen == 2 * sizeof(total11))) { 291 bzero(&total11, sizeof(total11)); 292 total11.t_rq = total.t_rq; 293 total11.t_dw = total.t_dw; 294 total11.t_pw = total.t_pw; 295 total11.t_sl = total.t_sl; 296 total11.t_sw = total.t_sw; 297 total11.t_vm = total.t_vm; /* truncate */ 298 total11.t_avm = total.t_avm; /* truncate */ 299 total11.t_rm = total.t_rm; /* truncate */ 300 total11.t_arm = total.t_arm; /* truncate */ 301 total11.t_vmshr = total.t_vmshr; /* truncate */ 302 total11.t_avmshr = total.t_avmshr; /* truncate */ 303 total11.t_rmshr = total.t_rmshr; /* truncate */ 304 total11.t_armshr = total.t_armshr; /* truncate */ 305 total11.t_free = total.t_free; /* truncate */ 306 return (SYSCTL_OUT(req, &total11, sizeof(total11))); 307 } 308 #endif 309 return (SYSCTL_OUT(req, &total, sizeof(total))); 310 } 311 312 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE | CTLFLAG_RD | 313 CTLFLAG_MPSAFE, NULL, 0, vmtotal, "S,vmtotal", 314 "System virtual memory statistics"); 315 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 316 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 317 "VM meter sys stats"); 318 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 319 "VM meter vm stats"); 320 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 321 322 static int 323 sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS) 324 { 325 uint64_t val; 326 #ifdef COMPAT_FREEBSD11 327 uint32_t val32; 328 #endif 329 330 val = counter_u64_fetch(*(counter_u64_t *)arg1); 331 #ifdef COMPAT_FREEBSD11 332 if (req->oldlen == sizeof(val32)) { 333 val32 = val; /* truncate */ 334 return (SYSCTL_OUT(req, &val32, sizeof(val32))); 335 } 336 #endif 337 return (SYSCTL_OUT(req, &val, sizeof(val))); 338 } 339 340 #define VM_STATS(parent, var, descr) \ 341 SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \ 342 CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr) 343 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 344 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 345 346 VM_STATS_SYS(v_swtch, "Context switches"); 347 VM_STATS_SYS(v_trap, "Traps"); 348 VM_STATS_SYS(v_syscall, "System calls"); 349 VM_STATS_SYS(v_intr, "Device interrupts"); 350 VM_STATS_SYS(v_soft, "Software interrupts"); 351 VM_STATS_VM(v_vm_faults, "Address memory faults"); 352 VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 353 VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 354 VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 355 VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 356 VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 357 VM_STATS_VM(v_swapin, "Swap pager pageins"); 358 VM_STATS_VM(v_swapout, "Swap pager pageouts"); 359 VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 360 VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 361 VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 362 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 363 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 364 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 365 VM_STATS_VM(v_intrans, "In transit page faults"); 366 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon"); 367 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 368 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 369 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls"); 370 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 371 VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 372 VM_STATS_VM(v_tfree, "Total pages freed"); 373 VM_STATS_VM(v_forks, "Number of fork() calls"); 374 VM_STATS_VM(v_vforks, "Number of vfork() calls"); 375 VM_STATS_VM(v_rforks, "Number of rfork() calls"); 376 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 377 VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 378 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 379 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 380 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 381 382 static int 383 sysctl_handle_vmstat_proc(SYSCTL_HANDLER_ARGS) 384 { 385 u_int (*fn)(void); 386 uint32_t val; 387 388 fn = arg1; 389 val = fn(); 390 return (SYSCTL_OUT(req, &val, sizeof(val))); 391 } 392 393 #define VM_STATS_PROC(var, descr, fn) \ 394 SYSCTL_OID(_vm_stats_vm, OID_AUTO, var, CTLTYPE_U32 | CTLFLAG_MPSAFE | \ 395 CTLFLAG_RD, fn, 0, sysctl_handle_vmstat_proc, "IU", descr) 396 397 #define VM_STATS_UINT(var, descr) \ 398 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr) 399 400 VM_STATS_UINT(v_page_size, "Page size in bytes"); 401 VM_STATS_UINT(v_page_count, "Total number of pages in system"); 402 VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock"); 403 VM_STATS_UINT(v_free_target, "Pages desired free"); 404 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold"); 405 VM_STATS_PROC(v_free_count, "Free pages", vm_free_count); 406 VM_STATS_UINT(v_wire_count, "Wired pages"); 407 VM_STATS_PROC(v_active_count, "Active pages", vm_active_count); 408 VM_STATS_UINT(v_inactive_target, "Desired inactive pages"); 409 VM_STATS_PROC(v_inactive_count, "Inactive pages", vm_inactive_count); 410 VM_STATS_PROC(v_laundry_count, "Pages eligible for laundering", 411 vm_laundry_count); 412 VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel"); 413 VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code"); 414 VM_STATS_UINT(v_free_severe, "Severe page depletion point"); 415 416 #ifdef COMPAT_FREEBSD11 417 /* 418 * Provide compatibility sysctls for the benefit of old utilities which exit 419 * with an error if they cannot be found. 420 */ 421 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD, 422 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 423 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD, 424 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 425 #endif 426 427 u_int 428 vm_free_count(void) 429 { 430 u_int v; 431 int i; 432 433 v = 0; 434 for (i = 0; i < vm_ndomains; i++) 435 v += vm_dom[i].vmd_free_count; 436 437 return (v); 438 } 439 440 static 441 u_int 442 vm_pagequeue_count(int pq) 443 { 444 u_int v; 445 int i; 446 447 v = 0; 448 for (i = 0; i < vm_ndomains; i++) 449 v += vm_dom[i].vmd_pagequeues[pq].pq_cnt; 450 451 return (v); 452 } 453 454 u_int 455 vm_active_count(void) 456 { 457 458 return vm_pagequeue_count(PQ_ACTIVE); 459 } 460 461 u_int 462 vm_inactive_count(void) 463 { 464 465 return vm_pagequeue_count(PQ_INACTIVE); 466 } 467 468 u_int 469 vm_laundry_count(void) 470 { 471 472 return vm_pagequeue_count(PQ_LAUNDRY); 473 } 474 475