Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_meter.c
Version:
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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 * 4. 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 <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/resource.h> 42 #include <sys/sx.h> 43 #include <sys/vmmeter.h> 44 #include <sys/smp.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_page.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_param.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_object.h> 53 #include <sys/sysctl.h> 54 55 struct vmmeter cnt; 56 57 int maxslp = MAXSLP; 58 59 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 60 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 61 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 62 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 63 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 64 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 65 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 66 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 67 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 68 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 69 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 70 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 71 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 72 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 73 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 74 CTLFLAG_RW, &cnt.v_free_severe, 0, ""); 75 76 static int 77 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 78 { 79 #ifdef SCTL_MASK32 80 u_int32_t la[4]; 81 82 if (req->flags & SCTL_MASK32) { 83 la[0] = averunnable.ldavg[0]; 84 la[1] = averunnable.ldavg[1]; 85 la[2] = averunnable.ldavg[2]; 86 la[3] = averunnable.fscale; 87 return SYSCTL_OUT(req, la, sizeof(la)); 88 } else 89 #endif 90 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 91 } 92 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT|CTLFLAG_RD, 93 NULL, 0, sysctl_vm_loadavg, "S,loadavg", "Machine loadaverage history"); 94 95 static int 96 vmtotal(SYSCTL_HANDLER_ARGS) 97 { 98 /* XXXKSE almost completely broken */ 99 struct proc *p; 100 struct vmtotal total; 101 vm_map_entry_t entry; 102 vm_object_t object; 103 vm_map_t map; 104 int paging; 105 struct thread *td; 106 struct vmspace *vm; 107 108 bzero(&total, sizeof(total)); 109 /* 110 * Mark all objects as inactive. 111 */ 112 GIANT_REQUIRED; 113 mtx_lock(&vm_object_list_mtx); 114 TAILQ_FOREACH(object, &vm_object_list, object_list) { 115 if (!VM_OBJECT_TRYLOCK(object)) { 116 /* 117 * Avoid a lock-order reversal. Consequently, 118 * the reported number of active pages may be 119 * greater than the actual number. 120 */ 121 continue; 122 } 123 vm_object_clear_flag(object, OBJ_ACTIVE); 124 VM_OBJECT_UNLOCK(object); 125 } 126 mtx_unlock(&vm_object_list_mtx); 127 /* 128 * Calculate process statistics. 129 */ 130 sx_slock(&allproc_lock); 131 FOREACH_PROC_IN_SYSTEM(p) { 132 if (p->p_flag & P_SYSTEM) 133 continue; 134 PROC_SLOCK(p); 135 switch (p->p_state) { 136 case PRS_NEW: 137 PROC_SUNLOCK(p); 138 continue; 139 break; 140 default: 141 FOREACH_THREAD_IN_PROC(p, td) { 142 /* Need new statistics XXX */ 143 thread_lock(td); 144 switch (td->td_state) { 145 case TDS_INHIBITED: 146 /* 147 * XXX stats no longer synchronized. 148 */ 149 if (TD_ON_LOCK(td) || 150 (td->td_inhibitors == 151 TDI_SWAPPED)) { 152 total.t_sw++; 153 } else if (TD_IS_SLEEPING(td) || 154 TD_AWAITING_INTR(td) || 155 TD_IS_SUSPENDED(td)) { 156 if (td->td_priority <= PZERO) 157 total.t_dw++; 158 else 159 total.t_sl++; 160 } 161 break; 162 163 case TDS_CAN_RUN: 164 total.t_sw++; 165 break; 166 case TDS_RUNQ: 167 case TDS_RUNNING: 168 total.t_rq++; 169 thread_unlock(td); 170 continue; 171 default: 172 break; 173 } 174 thread_unlock(td); 175 } 176 } 177 PROC_SUNLOCK(p); 178 /* 179 * Note active objects. 180 */ 181 paging = 0; 182 vm = vmspace_acquire_ref(p); 183 if (vm == NULL) 184 continue; 185 map = &vm->vm_map; 186 vm_map_lock_read(map); 187 for (entry = map->header.next; 188 entry != &map->header; entry = entry->next) { 189 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 190 (object = entry->object.vm_object) == NULL) 191 continue; 192 VM_OBJECT_LOCK(object); 193 vm_object_set_flag(object, OBJ_ACTIVE); 194 paging |= object->paging_in_progress; 195 VM_OBJECT_UNLOCK(object); 196 } 197 vm_map_unlock_read(map); 198 vmspace_free(vm); 199 if (paging) 200 total.t_pw++; 201 } 202 sx_sunlock(&allproc_lock); 203 /* 204 * Calculate object memory usage statistics. 205 */ 206 mtx_lock(&vm_object_list_mtx); 207 TAILQ_FOREACH(object, &vm_object_list, object_list) { 208 /* 209 * Perform unsynchronized reads on the object to avoid 210 * a lock-order reversal. In this case, the lack of 211 * synchronization should not impair the accuracy of 212 * the reported statistics. 213 */ 214 if (object->type == OBJT_DEVICE) { 215 /* 216 * Devices, like /dev/mem, will badly skew our totals. 217 */ 218 continue; 219 } 220 if (object->ref_count == 0) { 221 /* 222 * Also skip unreferenced objects, including 223 * vnodes representing mounted file systems. 224 */ 225 continue; 226 } 227 total.t_vm += object->size; 228 total.t_rm += object->resident_page_count; 229 if (object->flags & OBJ_ACTIVE) { 230 total.t_avm += object->size; 231 total.t_arm += object->resident_page_count; 232 } 233 if (object->shadow_count > 1) { 234 /* shared object */ 235 total.t_vmshr += object->size; 236 total.t_rmshr += object->resident_page_count; 237 if (object->flags & OBJ_ACTIVE) { 238 total.t_avmshr += object->size; 239 total.t_armshr += object->resident_page_count; 240 } 241 } 242 } 243 mtx_unlock(&vm_object_list_mtx); 244 total.t_free = cnt.v_free_count + cnt.v_cache_count; 245 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 246 } 247 248 /* 249 * vcnt() - accumulate statistics from all cpus and the global cnt 250 * structure. 251 * 252 * The vmmeter structure is now per-cpu as well as global. Those 253 * statistics which can be kept on a per-cpu basis (to avoid cache 254 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 255 * statistics, such as v_free_reserved, are left in the global 256 * structure. 257 * 258 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 259 */ 260 static int 261 vcnt(SYSCTL_HANDLER_ARGS) 262 { 263 int count = *(int *)arg1; 264 int offset = (char *)arg1 - (char *)&cnt; 265 #ifdef SMP 266 int i; 267 268 for (i = 0; i < mp_ncpus; ++i) { 269 struct pcpu *pcpu = pcpu_find(i); 270 count += *(int *)((char *)&pcpu->pc_cnt + offset); 271 } 272 #else 273 count += *(int *)((char *)PCPU_PTR(cnt) + offset); 274 #endif 275 return (SYSCTL_OUT(req, &count, sizeof(int))); 276 } 277 278 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD, 279 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 280 "System virtual memory statistics"); 281 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 282 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 283 "VM meter sys stats"); 284 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 285 "VM meter vm stats"); 286 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 287 288 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD, 289 &cnt.v_swtch, 0, vcnt, "IU", "Context switches"); 290 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD, 291 &cnt.v_trap, 0, vcnt, "IU", "Traps"); 292 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD, 293 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls"); 294 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD, 295 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts"); 296 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD, 297 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts"); 298 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD, 299 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults"); 300 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD, 301 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults"); 302 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD, 303 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults"); 304 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD, 305 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill"); 306 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD, 307 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill"); 308 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD, 309 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations"); 310 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD, 311 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations"); 312 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD, 313 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages"); 314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD, 315 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages"); 316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD, 317 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations"); 318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD, 319 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations"); 320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD, 321 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages"); 322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD, 323 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages"); 324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD, 325 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking"); 326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD, 327 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages"); 328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD, 329 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups"); 330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD, 331 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans"); 332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tcached, CTLTYPE_UINT|CTLFLAG_RD, 333 &cnt.v_tcached, 0, vcnt, "IU", "Total pages cached"); 334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD, 335 &cnt.v_dfree, 0, vcnt, "IU", ""); 336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD, 337 &cnt.v_pfree, 0, vcnt, "IU", ""); 338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD, 339 &cnt.v_tfree, 0, vcnt, "IU", ""); 340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD, 341 &cnt.v_page_size, 0, vcnt, "IU", ""); 342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD, 343 &cnt.v_page_count, 0, vcnt, "IU", ""); 344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD, 345 &cnt.v_free_reserved, 0, vcnt, "IU", ""); 346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD, 347 &cnt.v_free_target, 0, vcnt, "IU", ""); 348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD, 349 &cnt.v_free_min, 0, vcnt, "IU", ""); 350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD, 351 &cnt.v_free_count, 0, vcnt, "IU", ""); 352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD, 353 &cnt.v_wire_count, 0, vcnt, "IU", ""); 354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD, 355 &cnt.v_active_count, 0, vcnt, "IU", ""); 356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD, 357 &cnt.v_inactive_target, 0, vcnt, "IU", ""); 358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD, 359 &cnt.v_inactive_count, 0, vcnt, "IU", ""); 360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD, 361 &cnt.v_cache_count, 0, vcnt, "IU", ""); 362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD, 363 &cnt.v_cache_min, 0, vcnt, "IU", ""); 364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD, 365 &cnt.v_cache_max, 0, vcnt, "IU", ""); 366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD, 367 &cnt.v_pageout_free_min, 0, vcnt, "IU", ""); 368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD, 369 &cnt.v_interrupt_free_min, 0, vcnt, "IU", ""); 370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD, 371 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls"); 372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD, 373 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls"); 374 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD, 375 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls"); 376 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD, 377 &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel"); 378 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD, 379 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()"); 380 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD, 381 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()"); 382 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD, 383 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()"); 384 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD, 385 &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel"); 386 387 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 388 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");
Cache object: dce12c9b0c3bca9f9b18f97145039030
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