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/rwlock.h> 43 #include <sys/sx.h> 44 #include <sys/vmmeter.h> 45 #include <sys/smp.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_page.h> 49 #include <vm/vm_extern.h> 50 #include <vm/vm_param.h> 51 #include <vm/pmap.h> 52 #include <vm/vm_map.h> 53 #include <vm/vm_object.h> 54 #include <sys/sysctl.h> 55 56 struct vmmeter vm_cnt; 57 58 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 59 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 60 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 61 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages"); 62 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 63 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 64 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 65 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive"); 66 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 67 CTLFLAG_RW, &vm_cnt.v_cache_min, 0, "Min pages on cache queue"); 68 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 69 CTLFLAG_RW, &vm_cnt.v_cache_max, 0, "Max pages on cache queue"); 70 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 71 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 72 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 73 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 74 75 static int 76 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 77 { 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 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 94 "Machine loadaverage history"); 95 96 static int 97 vmtotal(SYSCTL_HANDLER_ARGS) 98 { 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 mtx_lock(&vm_object_list_mtx); 113 TAILQ_FOREACH(object, &vm_object_list, object_list) { 114 if (!VM_OBJECT_TRYWLOCK(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_WUNLOCK(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 switch (p->p_state) { 135 case PRS_NEW: 136 PROC_UNLOCK(p); 137 continue; 138 break; 139 default: 140 FOREACH_THREAD_IN_PROC(p, td) { 141 thread_lock(td); 142 switch (td->td_state) { 143 case TDS_INHIBITED: 144 if (TD_IS_SWAPPED(td)) 145 total.t_sw++; 146 else if (TD_IS_SLEEPING(td) && 147 td->td_priority <= PZERO) 148 total.t_dw++; 149 else 150 total.t_sl++; 151 break; 152 153 case TDS_CAN_RUN: 154 total.t_sw++; 155 break; 156 case TDS_RUNQ: 157 case TDS_RUNNING: 158 total.t_rq++; 159 thread_unlock(td); 160 continue; 161 default: 162 break; 163 } 164 thread_unlock(td); 165 } 166 } 167 PROC_UNLOCK(p); 168 /* 169 * Note active objects. 170 */ 171 paging = 0; 172 vm = vmspace_acquire_ref(p); 173 if (vm == NULL) 174 continue; 175 map = &vm->vm_map; 176 vm_map_lock_read(map); 177 for (entry = map->header.next; 178 entry != &map->header; entry = entry->next) { 179 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 180 (object = entry->object.vm_object) == NULL) 181 continue; 182 VM_OBJECT_WLOCK(object); 183 vm_object_set_flag(object, OBJ_ACTIVE); 184 paging |= object->paging_in_progress; 185 VM_OBJECT_WUNLOCK(object); 186 } 187 vm_map_unlock_read(map); 188 vmspace_free(vm); 189 if (paging) 190 total.t_pw++; 191 } 192 sx_sunlock(&allproc_lock); 193 /* 194 * Calculate object memory usage statistics. 195 */ 196 mtx_lock(&vm_object_list_mtx); 197 TAILQ_FOREACH(object, &vm_object_list, object_list) { 198 /* 199 * Perform unsynchronized reads on the object to avoid 200 * a lock-order reversal. In this case, the lack of 201 * synchronization should not impair the accuracy of 202 * the reported statistics. 203 */ 204 if ((object->flags & OBJ_FICTITIOUS) != 0) { 205 /* 206 * Devices, like /dev/mem, will badly skew our totals. 207 */ 208 continue; 209 } 210 if (object->ref_count == 0) { 211 /* 212 * Also skip unreferenced objects, including 213 * vnodes representing mounted file systems. 214 */ 215 continue; 216 } 217 total.t_vm += object->size; 218 total.t_rm += object->resident_page_count; 219 if (object->flags & OBJ_ACTIVE) { 220 total.t_avm += object->size; 221 total.t_arm += object->resident_page_count; 222 } 223 if (object->shadow_count > 1) { 224 /* shared object */ 225 total.t_vmshr += object->size; 226 total.t_rmshr += object->resident_page_count; 227 if (object->flags & OBJ_ACTIVE) { 228 total.t_avmshr += object->size; 229 total.t_armshr += object->resident_page_count; 230 } 231 } 232 } 233 mtx_unlock(&vm_object_list_mtx); 234 total.t_free = vm_cnt.v_free_count + vm_cnt.v_cache_count; 235 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 236 } 237 238 /* 239 * vcnt() - accumulate statistics from all cpus and the global cnt 240 * structure. 241 * 242 * The vmmeter structure is now per-cpu as well as global. Those 243 * statistics which can be kept on a per-cpu basis (to avoid cache 244 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 245 * statistics, such as v_free_reserved, are left in the global 246 * structure. 247 * 248 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 249 */ 250 static int 251 vcnt(SYSCTL_HANDLER_ARGS) 252 { 253 int count = *(int *)arg1; 254 int offset = (char *)arg1 - (char *)&vm_cnt; 255 int i; 256 257 CPU_FOREACH(i) { 258 struct pcpu *pcpu = pcpu_find(i); 259 count += *(int *)((char *)&pcpu->pc_cnt + offset); 260 } 261 return (SYSCTL_OUT(req, &count, sizeof(int))); 262 } 263 264 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 265 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 266 "System virtual memory statistics"); 267 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 268 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 269 "VM meter sys stats"); 270 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 271 "VM meter vm stats"); 272 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 273 274 #define VM_STATS(parent, var, descr) \ 275 SYSCTL_PROC(parent, OID_AUTO, var, \ 276 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, vcnt, \ 277 "IU", descr) 278 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 279 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 280 281 VM_STATS_SYS(v_swtch, "Context switches"); 282 VM_STATS_SYS(v_trap, "Traps"); 283 VM_STATS_SYS(v_syscall, "System calls"); 284 VM_STATS_SYS(v_intr, "Device interrupts"); 285 VM_STATS_SYS(v_soft, "Software interrupts"); 286 VM_STATS_VM(v_vm_faults, "Address memory faults"); 287 VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 288 VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 289 VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 290 VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 291 VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 292 VM_STATS_VM(v_swapin, "Swap pager pageins"); 293 VM_STATS_VM(v_swapout, "Swap pager pageouts"); 294 VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 295 VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 296 VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 297 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 298 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 299 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 300 VM_STATS_VM(v_intrans, "In transit page faults"); 301 VM_STATS_VM(v_reactivated, "Pages reactivated from free list"); 302 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 303 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 304 VM_STATS_VM(v_tcached, "Total pages cached"); 305 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 306 VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 307 VM_STATS_VM(v_tfree, "Total pages freed"); 308 VM_STATS_VM(v_page_size, "Page size in bytes"); 309 VM_STATS_VM(v_page_count, "Total number of pages in system"); 310 VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 311 VM_STATS_VM(v_free_target, "Pages desired free"); 312 VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 313 VM_STATS_VM(v_free_count, "Free pages"); 314 VM_STATS_VM(v_wire_count, "Wired pages"); 315 VM_STATS_VM(v_active_count, "Active pages"); 316 VM_STATS_VM(v_inactive_target, "Desired inactive pages"); 317 VM_STATS_VM(v_inactive_count, "Inactive pages"); 318 VM_STATS_VM(v_cache_count, "Pages on cache queue"); 319 VM_STATS_VM(v_cache_min, "Min pages on cache queue"); 320 VM_STATS_VM(v_cache_max, "Max pages on cached queue"); 321 VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 322 VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 323 VM_STATS_VM(v_forks, "Number of fork() calls"); 324 VM_STATS_VM(v_vforks, "Number of vfork() calls"); 325 VM_STATS_VM(v_rforks, "Number of rfork() calls"); 326 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 327 VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 328 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 329 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 330 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 331 332 SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 333 &vm_page_zero_count, 0, "Number of zero-ed free pages"); 334