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: releng/6.1/sys/vm/vm_meter.c 158179 2006-04-30 16:44:43Z cvs2svn $"); 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 /* 56 * Virtual memory MPSAFE temporary workarounds. 57 */ 58 #if !defined(__arm__) && !defined(__powerpc__) 59 int debug_mpsafevm = 1; 60 #else 61 int debug_mpsafevm; 62 #endif 63 TUNABLE_INT("debug.mpsafevm", &debug_mpsafevm); 64 SYSCTL_INT(_debug, OID_AUTO, mpsafevm, CTLFLAG_RD, &debug_mpsafevm, 0, 65 "Enable/disable MPSAFE virtual memory support"); 66 67 struct vmmeter cnt; 68 69 int maxslp = MAXSLP; 70 71 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 72 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 73 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 74 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 75 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 76 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 77 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 78 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 79 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 80 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 81 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 82 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 83 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 84 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 85 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 86 CTLFLAG_RW, &cnt.v_free_severe, 0, ""); 87 88 static int 89 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 90 { 91 #ifdef SCTL_MASK32 92 u_int32_t la[4]; 93 94 if (req->flags & SCTL_MASK32) { 95 la[0] = averunnable.ldavg[0]; 96 la[1] = averunnable.ldavg[1]; 97 la[2] = averunnable.ldavg[2]; 98 la[3] = averunnable.fscale; 99 return SYSCTL_OUT(req, la, sizeof(la)); 100 } else 101 #endif 102 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 103 } 104 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT|CTLFLAG_RD, 105 NULL, 0, sysctl_vm_loadavg, "S,loadavg", "Machine loadaverage history"); 106 107 static int 108 vmtotal(SYSCTL_HANDLER_ARGS) 109 { 110 /* XXXKSE almost completely broken */ 111 struct proc *p; 112 struct vmtotal total, *totalp; 113 vm_map_entry_t entry; 114 vm_object_t object; 115 vm_map_t map; 116 int paging; 117 struct thread *td; 118 119 totalp = &total; 120 bzero(totalp, sizeof *totalp); 121 /* 122 * Mark all objects as inactive. 123 */ 124 GIANT_REQUIRED; 125 mtx_lock(&vm_object_list_mtx); 126 TAILQ_FOREACH(object, &vm_object_list, object_list) { 127 if (!VM_OBJECT_TRYLOCK(object)) { 128 /* 129 * Avoid a lock-order reversal. Consequently, 130 * the reported number of active pages may be 131 * greater than the actual number. 132 */ 133 continue; 134 } 135 vm_object_clear_flag(object, OBJ_ACTIVE); 136 VM_OBJECT_UNLOCK(object); 137 } 138 mtx_unlock(&vm_object_list_mtx); 139 /* 140 * Calculate process statistics. 141 */ 142 sx_slock(&allproc_lock); 143 FOREACH_PROC_IN_SYSTEM(p) { 144 if (p->p_flag & P_SYSTEM) 145 continue; 146 mtx_lock_spin(&sched_lock); 147 switch (p->p_state) { 148 case PRS_NEW: 149 mtx_unlock_spin(&sched_lock); 150 continue; 151 break; 152 default: 153 FOREACH_THREAD_IN_PROC(p, td) { 154 /* Need new statistics XXX */ 155 switch (td->td_state) { 156 case TDS_INHIBITED: 157 if (TD_ON_LOCK(td) || 158 (td->td_inhibitors == 159 TDI_SWAPPED)) { 160 totalp->t_sw++; 161 } else if (TD_IS_SLEEPING(td) || 162 TD_AWAITING_INTR(td) || 163 TD_IS_SUSPENDED(td)) { 164 if (td->td_priority <= PZERO) 165 totalp->t_dw++; 166 else 167 totalp->t_sl++; 168 } 169 break; 170 171 case TDS_CAN_RUN: 172 totalp->t_sw++; 173 break; 174 case TDS_RUNQ: 175 case TDS_RUNNING: 176 totalp->t_rq++; 177 continue; 178 default: 179 break; 180 } 181 } 182 } 183 mtx_unlock_spin(&sched_lock); 184 /* 185 * Note active objects. 186 */ 187 paging = 0; 188 map = &p->p_vmspace->vm_map; 189 vm_map_lock_read(map); 190 for (entry = map->header.next; 191 entry != &map->header; entry = entry->next) { 192 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 193 (object = entry->object.vm_object) == NULL) 194 continue; 195 VM_OBJECT_LOCK(object); 196 vm_object_set_flag(object, OBJ_ACTIVE); 197 paging |= object->paging_in_progress; 198 VM_OBJECT_UNLOCK(object); 199 } 200 vm_map_unlock_read(map); 201 if (paging) 202 totalp->t_pw++; 203 } 204 sx_sunlock(&allproc_lock); 205 /* 206 * Calculate object memory usage statistics. 207 */ 208 mtx_lock(&vm_object_list_mtx); 209 TAILQ_FOREACH(object, &vm_object_list, object_list) { 210 /* 211 * Perform unsynchronized reads on the object to avoid 212 * a lock-order reversal. In this case, the lack of 213 * synchronization should not impair the accuracy of 214 * the reported statistics. 215 */ 216 if (object->type == OBJT_DEVICE) { 217 /* 218 * Devices, like /dev/mem, will badly skew our totals. 219 */ 220 continue; 221 } 222 totalp->t_vm += object->size; 223 totalp->t_rm += object->resident_page_count; 224 if (object->flags & OBJ_ACTIVE) { 225 totalp->t_avm += object->size; 226 totalp->t_arm += object->resident_page_count; 227 } 228 if (object->shadow_count > 1) { 229 /* shared object */ 230 totalp->t_vmshr += object->size; 231 totalp->t_rmshr += object->resident_page_count; 232 if (object->flags & OBJ_ACTIVE) { 233 totalp->t_avmshr += object->size; 234 totalp->t_armshr += object->resident_page_count; 235 } 236 } 237 } 238 mtx_unlock(&vm_object_list_mtx); 239 totalp->t_free = cnt.v_free_count + cnt.v_cache_count; 240 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req)); 241 } 242 243 /* 244 * vcnt() - accumulate statistics from all cpus and the global cnt 245 * structure. 246 * 247 * The vmmeter structure is now per-cpu as well as global. Those 248 * statistics which can be kept on a per-cpu basis (to avoid cache 249 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 250 * statistics, such as v_free_reserved, are left in the global 251 * structure. 252 * 253 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 254 */ 255 static int 256 vcnt(SYSCTL_HANDLER_ARGS) 257 { 258 int count = *(int *)arg1; 259 int offset = (char *)arg1 - (char *)&cnt; 260 #ifdef SMP 261 int i; 262 263 for (i = 0; i < mp_ncpus; ++i) { 264 struct pcpu *pcpu = pcpu_find(i); 265 count += *(int *)((char *)&pcpu->pc_cnt + offset); 266 } 267 #else 268 count += *(int *)((char *)PCPU_PTR(cnt) + offset); 269 #endif 270 return (SYSCTL_OUT(req, &count, sizeof(int))); 271 } 272 273 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD, 274 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 275 "System virtual memory statistics"); 276 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 277 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 278 "VM meter sys stats"); 279 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 280 "VM meter vm stats"); 281 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 282 283 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD, 284 &cnt.v_swtch, 0, vcnt, "IU", "Context switches"); 285 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD, 286 &cnt.v_trap, 0, vcnt, "IU", "Traps"); 287 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD, 288 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls"); 289 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD, 290 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts"); 291 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD, 292 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts"); 293 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD, 294 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults"); 295 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD, 296 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults"); 297 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD, 298 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults"); 299 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD, 300 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill"); 301 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD, 302 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill"); 303 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD, 304 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations"); 305 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD, 306 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations"); 307 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD, 308 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages"); 309 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD, 310 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages"); 311 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD, 312 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations"); 313 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD, 314 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations"); 315 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD, 316 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages"); 317 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD, 318 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages"); 319 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD, 320 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking"); 321 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD, 322 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages"); 323 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD, 324 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups"); 325 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD, 326 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans"); 327 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD, 328 &cnt.v_dfree, 0, vcnt, "IU", ""); 329 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD, 330 &cnt.v_pfree, 0, vcnt, "IU", ""); 331 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD, 332 &cnt.v_tfree, 0, vcnt, "IU", ""); 333 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD, 334 &cnt.v_page_size, 0, vcnt, "IU", ""); 335 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD, 336 &cnt.v_page_count, 0, vcnt, "IU", ""); 337 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD, 338 &cnt.v_free_reserved, 0, vcnt, "IU", ""); 339 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD, 340 &cnt.v_free_target, 0, vcnt, "IU", ""); 341 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD, 342 &cnt.v_free_min, 0, vcnt, "IU", ""); 343 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD, 344 &cnt.v_free_count, 0, vcnt, "IU", ""); 345 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD, 346 &cnt.v_wire_count, 0, vcnt, "IU", ""); 347 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD, 348 &cnt.v_active_count, 0, vcnt, "IU", ""); 349 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD, 350 &cnt.v_inactive_target, 0, vcnt, "IU", ""); 351 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD, 352 &cnt.v_inactive_count, 0, vcnt, "IU", ""); 353 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD, 354 &cnt.v_cache_count, 0, vcnt, "IU", ""); 355 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD, 356 &cnt.v_cache_min, 0, vcnt, "IU", ""); 357 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD, 358 &cnt.v_cache_max, 0, vcnt, "IU", ""); 359 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD, 360 &cnt.v_pageout_free_min, 0, vcnt, "IU", ""); 361 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD, 362 &cnt.v_interrupt_free_min, 0, vcnt, "IU", ""); 363 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD, 364 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls"); 365 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD, 366 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls"); 367 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD, 368 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls"); 369 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD, 370 &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel"); 371 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD, 372 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()"); 373 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD, 374 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()"); 375 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD, 376 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()"); 377 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD, 378 &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel"); 379 380 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 381 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, ""); 382 #if 0 383 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 384 page_mask, CTLFLAG_RD, &page_mask, 0, ""); 385 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 386 page_shift, CTLFLAG_RD, &page_shift, 0, ""); 387 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 388 first_page, CTLFLAG_RD, &first_page, 0, ""); 389 SYSCTL_INT(_vm_stats_misc, OID_AUTO, 390 last_page, CTLFLAG_RD, &last_page, 0, ""); 391 #endif
Cache object: 8c9bb12de4d8fd3e05d3ce4d785918da
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