vm_meter.c revision 177368
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: head/sys/vm/vm_meter.c 177368 2008-03-19 06:19:01Z jeff $"); 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 55struct vmmeter cnt; 56 57int maxslp = MAXSLP; 58 59SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 60 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 61SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 62 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 63SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 64 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 65SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 66 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 67SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 68 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 69SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 70 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 71SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 72 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 73SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 74 CTLFLAG_RW, &cnt.v_free_severe, 0, ""); 75 76static int 77sysctl_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} 92SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT|CTLFLAG_RD, 93 NULL, 0, sysctl_vm_loadavg, "S,loadavg", "Machine loadaverage history"); 94 95static int 96vmtotal(SYSCTL_HANDLER_ARGS) 97{ 98 struct proc *p; 99 struct vmtotal total; 100 vm_map_entry_t entry; 101 vm_object_t object; 102 vm_map_t map; 103 int paging; 104 struct thread *td; 105 struct vmspace *vm; 106 107 bzero(&total, sizeof(total)); 108 /* 109 * Mark all objects as inactive. 110 */ 111 GIANT_REQUIRED; 112 mtx_lock(&vm_object_list_mtx); 113 TAILQ_FOREACH(object, &vm_object_list, object_list) { 114 if (!VM_OBJECT_TRYLOCK(object)) { 115 /* 116 * Avoid a lock-order reversal. Consequently, 117 * the reported number of active pages may be 118 * greater than the actual number. 119 */ 120 continue; 121 } 122 vm_object_clear_flag(object, OBJ_ACTIVE); 123 VM_OBJECT_UNLOCK(object); 124 } 125 mtx_unlock(&vm_object_list_mtx); 126 /* 127 * Calculate process statistics. 128 */ 129 sx_slock(&allproc_lock); 130 FOREACH_PROC_IN_SYSTEM(p) { 131 if (p->p_flag & P_SYSTEM) 132 continue; 133 PROC_LOCK(p); 134 PROC_SLOCK(p); 135 switch (p->p_state) { 136 case PRS_NEW: 137 PROC_SUNLOCK(p); 138 PROC_UNLOCK(p); 139 continue; 140 break; 141 default: 142 PROC_SUNLOCK(p); 143 FOREACH_THREAD_IN_PROC(p, td) { 144 thread_lock(td); 145 switch (td->td_state) { 146 case TDS_INHIBITED: 147 if (TD_IS_SWAPPED(td)) 148 total.t_sw++; 149 else if (TD_IS_SLEEPING(td) && 150 td->td_priority <= PZERO) 151 total.t_dw++; 152 else 153 total.t_sl++; 154 break; 155 156 case TDS_CAN_RUN: 157 total.t_sw++; 158 break; 159 case TDS_RUNQ: 160 case TDS_RUNNING: 161 total.t_rq++; 162 thread_unlock(td); 163 continue; 164 default: 165 break; 166 } 167 thread_unlock(td); 168 } 169 } 170 PROC_UNLOCK(p); 171 /* 172 * Note active objects. 173 */ 174 paging = 0; 175 vm = vmspace_acquire_ref(p); 176 if (vm == NULL) 177 continue; 178 map = &vm->vm_map; 179 vm_map_lock_read(map); 180 for (entry = map->header.next; 181 entry != &map->header; entry = entry->next) { 182 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 183 (object = entry->object.vm_object) == NULL) 184 continue; 185 VM_OBJECT_LOCK(object); 186 vm_object_set_flag(object, OBJ_ACTIVE); 187 paging |= object->paging_in_progress; 188 VM_OBJECT_UNLOCK(object); 189 } 190 vm_map_unlock_read(map); 191 vmspace_free(vm); 192 if (paging) 193 total.t_pw++; 194 } 195 sx_sunlock(&allproc_lock); 196 /* 197 * Calculate object memory usage statistics. 198 */ 199 mtx_lock(&vm_object_list_mtx); 200 TAILQ_FOREACH(object, &vm_object_list, object_list) { 201 /* 202 * Perform unsynchronized reads on the object to avoid 203 * a lock-order reversal. In this case, the lack of 204 * synchronization should not impair the accuracy of 205 * the reported statistics. 206 */ 207 if (object->type == OBJT_DEVICE) { 208 /* 209 * Devices, like /dev/mem, will badly skew our totals. 210 */ 211 continue; 212 } 213 if (object->ref_count == 0) { 214 /* 215 * Also skip unreferenced objects, including 216 * vnodes representing mounted file systems. 217 */ 218 continue; 219 } 220 total.t_vm += object->size; 221 total.t_rm += object->resident_page_count; 222 if (object->flags & OBJ_ACTIVE) { 223 total.t_avm += object->size; 224 total.t_arm += object->resident_page_count; 225 } 226 if (object->shadow_count > 1) { 227 /* shared object */ 228 total.t_vmshr += object->size; 229 total.t_rmshr += object->resident_page_count; 230 if (object->flags & OBJ_ACTIVE) { 231 total.t_avmshr += object->size; 232 total.t_armshr += object->resident_page_count; 233 } 234 } 235 } 236 mtx_unlock(&vm_object_list_mtx); 237 total.t_free = cnt.v_free_count + cnt.v_cache_count; 238 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 239} 240 241/* 242 * vcnt() - accumulate statistics from all cpus and the global cnt 243 * structure. 244 * 245 * The vmmeter structure is now per-cpu as well as global. Those 246 * statistics which can be kept on a per-cpu basis (to avoid cache 247 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 248 * statistics, such as v_free_reserved, are left in the global 249 * structure. 250 * 251 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 252 */ 253static int 254vcnt(SYSCTL_HANDLER_ARGS) 255{ 256 int count = *(int *)arg1; 257 int offset = (char *)arg1 - (char *)&cnt; 258#ifdef SMP 259 int i; 260 261 for (i = 0; i < mp_ncpus; ++i) { 262 struct pcpu *pcpu = pcpu_find(i); 263 count += *(int *)((char *)&pcpu->pc_cnt + offset); 264 } 265#else 266 count += *(int *)((char *)PCPU_PTR(cnt) + offset); 267#endif 268 return (SYSCTL_OUT(req, &count, sizeof(int))); 269} 270 271SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD, 272 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 273 "System virtual memory statistics"); 274SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 275static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 276 "VM meter sys stats"); 277static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 278 "VM meter vm stats"); 279SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 280 281SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD, 282 &cnt.v_swtch, 0, vcnt, "IU", "Context switches"); 283SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD, 284 &cnt.v_trap, 0, vcnt, "IU", "Traps"); 285SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD, 286 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls"); 287SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD, 288 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts"); 289SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD, 290 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts"); 291SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD, 292 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults"); 293SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD, 294 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults"); 295SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD, 296 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults"); 297SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD, 298 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill"); 299SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD, 300 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill"); 301SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD, 302 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations"); 303SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD, 304 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations"); 305SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD, 306 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages"); 307SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD, 308 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages"); 309SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD, 310 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations"); 311SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD, 312 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations"); 313SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD, 314 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages"); 315SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD, 316 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages"); 317SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD, 318 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking"); 319SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD, 320 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages"); 321SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD, 322 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups"); 323SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD, 324 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans"); 325SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tcached, CTLTYPE_UINT|CTLFLAG_RD, 326 &cnt.v_tcached, 0, vcnt, "IU", "Total pages cached"); 327SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD, 328 &cnt.v_dfree, 0, vcnt, "IU", ""); 329SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD, 330 &cnt.v_pfree, 0, vcnt, "IU", ""); 331SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD, 332 &cnt.v_tfree, 0, vcnt, "IU", ""); 333SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD, 334 &cnt.v_page_size, 0, vcnt, "IU", ""); 335SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD, 336 &cnt.v_page_count, 0, vcnt, "IU", ""); 337SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD, 338 &cnt.v_free_reserved, 0, vcnt, "IU", ""); 339SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD, 340 &cnt.v_free_target, 0, vcnt, "IU", ""); 341SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD, 342 &cnt.v_free_min, 0, vcnt, "IU", ""); 343SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD, 344 &cnt.v_free_count, 0, vcnt, "IU", ""); 345SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD, 346 &cnt.v_wire_count, 0, vcnt, "IU", ""); 347SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD, 348 &cnt.v_active_count, 0, vcnt, "IU", ""); 349SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD, 350 &cnt.v_inactive_target, 0, vcnt, "IU", ""); 351SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD, 352 &cnt.v_inactive_count, 0, vcnt, "IU", ""); 353SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD, 354 &cnt.v_cache_count, 0, vcnt, "IU", ""); 355SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD, 356 &cnt.v_cache_min, 0, vcnt, "IU", ""); 357SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD, 358 &cnt.v_cache_max, 0, vcnt, "IU", ""); 359SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD, 360 &cnt.v_pageout_free_min, 0, vcnt, "IU", ""); 361SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD, 362 &cnt.v_interrupt_free_min, 0, vcnt, "IU", ""); 363SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD, 364 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls"); 365SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD, 366 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls"); 367SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD, 368 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls"); 369SYSCTL_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"); 371SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD, 372 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()"); 373SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD, 374 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()"); 375SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD, 376 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()"); 377SYSCTL_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 380SYSCTL_INT(_vm_stats_misc, OID_AUTO, 381 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, ""); 382