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 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 static int 156 vmtotal(SYSCTL_HANDLER_ARGS) 157 { 158 struct vmtotal total; 159 vm_object_t object; 160 struct proc *p; 161 struct thread *td; 162 163 bzero(&total, sizeof(total)); 164 165 /* 166 * Calculate process statistics. 167 */ 168 sx_slock(&allproc_lock); 169 FOREACH_PROC_IN_SYSTEM(p) { 170 if ((p->p_flag & P_SYSTEM) != 0) 171 continue; 172 PROC_LOCK(p); 173 if (p->p_state != PRS_NEW) { 174 FOREACH_THREAD_IN_PROC(p, td) { 175 thread_lock(td); 176 switch (td->td_state) { 177 case TDS_INHIBITED: 178 if (TD_IS_SWAPPED(td)) 179 total.t_sw++; 180 else if (TD_IS_SLEEPING(td)) { 181 if (td->td_priority <= PZERO) 182 total.t_dw++; 183 else 184 total.t_sl++; 185 if (td->td_wchan == 186 &vm_cnt.v_free_count) 187 total.t_pw++; 188 } 189 break; 190 case TDS_CAN_RUN: 191 total.t_sw++; 192 break; 193 case TDS_RUNQ: 194 case TDS_RUNNING: 195 total.t_rq++; 196 break; 197 default: 198 break; 199 } 200 thread_unlock(td); 201 } 202 } 203 PROC_UNLOCK(p); 204 } 205 sx_sunlock(&allproc_lock); 206 /* 207 * Calculate object memory usage statistics. 208 */ 209 mtx_lock(&vm_object_list_mtx); 210 TAILQ_FOREACH(object, &vm_object_list, object_list) { 211 /* 212 * Perform unsynchronized reads on the object. In 213 * this case, the lack of synchronization should not 214 * impair the accuracy of the reported statistics. 215 */ 216 if ((object->flags & OBJ_FICTITIOUS) != 0) { 217 /* 218 * Devices, like /dev/mem, will badly skew our totals. 219 */ 220 continue; 221 } 222 if (object->ref_count == 0) { 223 /* 224 * Also skip unreferenced objects, including 225 * vnodes representing mounted file systems. 226 */ 227 continue; 228 } 229 if (object->ref_count == 1 && 230 (object->flags & OBJ_NOSPLIT) != 0) { 231 /* 232 * Also skip otherwise unreferenced swap 233 * objects backing tmpfs vnodes, and POSIX or 234 * SysV shared memory. 235 */ 236 continue; 237 } 238 total.t_vm += object->size; 239 total.t_rm += object->resident_page_count; 240 if (is_object_active(object)) { 241 total.t_avm += object->size; 242 total.t_arm += object->resident_page_count; 243 } 244 if (object->shadow_count > 1) { 245 /* shared object */ 246 total.t_vmshr += object->size; 247 total.t_rmshr += object->resident_page_count; 248 if (is_object_active(object)) { 249 total.t_avmshr += object->size; 250 total.t_armshr += object->resident_page_count; 251 } 252 } 253 } 254 mtx_unlock(&vm_object_list_mtx); 255 total.t_free = vm_cnt.v_free_count; 256 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 257 } 258 259 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 260 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 261 "System virtual memory statistics"); 262 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 263 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 264 "VM meter sys stats"); 265 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 266 "VM meter vm stats"); 267 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 268 269 static int 270 sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS) 271 { 272 uint64_t val; 273 #ifdef COMPAT_FREEBSD11 274 uint32_t val32; 275 #endif 276 277 val = counter_u64_fetch(*(counter_u64_t *)arg1); 278 #ifdef COMPAT_FREEBSD11 279 if (req->oldlen == sizeof(val32)) { 280 val32 = val; /* truncate */ 281 return (SYSCTL_OUT(req, &val32, sizeof(val32))); 282 } 283 #endif 284 return (SYSCTL_OUT(req, &val, sizeof(val))); 285 } 286 287 #define VM_STATS(parent, var, descr) \ 288 SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \ 289 CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr); 290 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 291 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 292 293 VM_STATS_SYS(v_swtch, "Context switches"); 294 VM_STATS_SYS(v_trap, "Traps"); 295 VM_STATS_SYS(v_syscall, "System calls"); 296 VM_STATS_SYS(v_intr, "Device interrupts"); 297 VM_STATS_SYS(v_soft, "Software interrupts"); 298 VM_STATS_VM(v_vm_faults, "Address memory faults"); 299 VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 300 VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 301 VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 302 VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 303 VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 304 VM_STATS_VM(v_swapin, "Swap pager pageins"); 305 VM_STATS_VM(v_swapout, "Swap pager pageouts"); 306 VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 307 VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 308 VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 309 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 310 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 311 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 312 VM_STATS_VM(v_intrans, "In transit page faults"); 313 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon"); 314 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 315 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 316 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls"); 317 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 318 VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 319 VM_STATS_VM(v_tfree, "Total pages freed"); 320 VM_STATS_VM(v_forks, "Number of fork() calls"); 321 VM_STATS_VM(v_vforks, "Number of vfork() calls"); 322 VM_STATS_VM(v_rforks, "Number of rfork() calls"); 323 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 324 VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 325 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 326 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 327 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 328 329 #define VM_STATS_UINT(var, descr) \ 330 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr) 331 VM_STATS_UINT(v_page_size, "Page size in bytes"); 332 VM_STATS_UINT(v_page_count, "Total number of pages in system"); 333 VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock"); 334 VM_STATS_UINT(v_free_target, "Pages desired free"); 335 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold"); 336 VM_STATS_UINT(v_free_count, "Free pages"); 337 VM_STATS_UINT(v_wire_count, "Wired pages"); 338 VM_STATS_UINT(v_active_count, "Active pages"); 339 VM_STATS_UINT(v_inactive_target, "Desired inactive pages"); 340 VM_STATS_UINT(v_inactive_count, "Inactive pages"); 341 VM_STATS_UINT(v_laundry_count, "Pages eligible for laundering"); 342 VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel"); 343 VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code"); 344 VM_STATS_UINT(v_free_severe, "Severe page depletion point"); 345 346 #ifdef COMPAT_FREEBSD11 347 /* 348 * Provide compatibility sysctls for the benefit of old utilities which exit 349 * with an error if they cannot be found. 350 */ 351 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD, 352 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 353 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD, 354 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 355 #endif 356