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/mutex.h> 42 #include <sys/proc.h> 43 #include <sys/resource.h> 44 #include <sys/rwlock.h> 45 #include <sys/sx.h> 46 #include <sys/vmmeter.h> 47 #include <sys/smp.h> 48 49 #include <vm/vm.h> 50 #include <vm/vm_page.h> 51 #include <vm/vm_extern.h> 52 #include <vm/vm_param.h> 53 #include <vm/pmap.h> 54 #include <vm/vm_map.h> 55 #include <vm/vm_object.h> 56 #include <sys/sysctl.h> 57 58 struct vmmeter vm_cnt; 59 60 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 61 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 62 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 63 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages"); 64 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 65 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 66 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 67 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive"); 68 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 69 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 70 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 71 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 72 73 static int 74 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 75 { 76 77 #ifdef SCTL_MASK32 78 u_int32_t la[4]; 79 80 if (req->flags & SCTL_MASK32) { 81 la[0] = averunnable.ldavg[0]; 82 la[1] = averunnable.ldavg[1]; 83 la[2] = averunnable.ldavg[2]; 84 la[3] = averunnable.fscale; 85 return SYSCTL_OUT(req, la, sizeof(la)); 86 } else 87 #endif 88 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 89 } 90 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 91 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 92 "Machine loadaverage history"); 93 94 /* 95 * This function aims to determine if the object is mapped, 96 * specifically, if it is referenced by a vm_map_entry. Because 97 * objects occasionally acquire transient references that do not 98 * represent a mapping, the method used here is inexact. However, it 99 * has very low overhead and is good enough for the advisory 100 * vm.vmtotal sysctl. 101 */ 102 static bool 103 is_object_active(vm_object_t obj) 104 { 105 106 return (obj->ref_count > obj->shadow_count); 107 } 108 109 static int 110 vmtotal(SYSCTL_HANDLER_ARGS) 111 { 112 struct vmtotal total; 113 vm_object_t object; 114 struct proc *p; 115 struct thread *td; 116 117 bzero(&total, sizeof(total)); 118 119 /* 120 * Calculate process statistics. 121 */ 122 sx_slock(&allproc_lock); 123 FOREACH_PROC_IN_SYSTEM(p) { 124 if ((p->p_flag & P_SYSTEM) != 0) 125 continue; 126 PROC_LOCK(p); 127 if (p->p_state != PRS_NEW) { 128 FOREACH_THREAD_IN_PROC(p, td) { 129 thread_lock(td); 130 switch (td->td_state) { 131 case TDS_INHIBITED: 132 if (TD_IS_SWAPPED(td)) 133 total.t_sw++; 134 else if (TD_IS_SLEEPING(td)) { 135 if (td->td_priority <= PZERO) 136 total.t_dw++; 137 else 138 total.t_sl++; 139 if (td->td_wchan == 140 &vm_cnt.v_free_count) 141 total.t_pw++; 142 } 143 break; 144 case TDS_CAN_RUN: 145 total.t_sw++; 146 break; 147 case TDS_RUNQ: 148 case TDS_RUNNING: 149 total.t_rq++; 150 break; 151 default: 152 break; 153 } 154 thread_unlock(td); 155 } 156 } 157 PROC_UNLOCK(p); 158 } 159 sx_sunlock(&allproc_lock); 160 /* 161 * Calculate object memory usage statistics. 162 */ 163 mtx_lock(&vm_object_list_mtx); 164 TAILQ_FOREACH(object, &vm_object_list, object_list) { 165 /* 166 * Perform unsynchronized reads on the object. In 167 * this case, the lack of synchronization should not 168 * impair the accuracy of the reported statistics. 169 */ 170 if ((object->flags & OBJ_FICTITIOUS) != 0) { 171 /* 172 * Devices, like /dev/mem, will badly skew our totals. 173 */ 174 continue; 175 } 176 if (object->ref_count == 0) { 177 /* 178 * Also skip unreferenced objects, including 179 * vnodes representing mounted file systems. 180 */ 181 continue; 182 } 183 if (object->ref_count == 1 && 184 (object->flags & OBJ_NOSPLIT) != 0) { 185 /* 186 * Also skip otherwise unreferenced swap 187 * objects backing tmpfs vnodes, and POSIX or 188 * SysV shared memory. 189 */ 190 continue; 191 } 192 total.t_vm += object->size; 193 total.t_rm += object->resident_page_count; 194 if (is_object_active(object)) { 195 total.t_avm += object->size; 196 total.t_arm += object->resident_page_count; 197 } 198 if (object->shadow_count > 1) { 199 /* shared object */ 200 total.t_vmshr += object->size; 201 total.t_rmshr += object->resident_page_count; 202 if (is_object_active(object)) { 203 total.t_avmshr += object->size; 204 total.t_armshr += object->resident_page_count; 205 } 206 } 207 } 208 mtx_unlock(&vm_object_list_mtx); 209 total.t_free = vm_cnt.v_free_count; 210 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 211 } 212 213 /* 214 * vm_meter_cnt() - accumulate statistics from all cpus and the global cnt 215 * structure. 216 * 217 * The vmmeter structure is now per-cpu as well as global. Those 218 * statistics which can be kept on a per-cpu basis (to avoid cache 219 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 220 * statistics, such as v_free_reserved, are left in the global 221 * structure. 222 */ 223 u_int 224 vm_meter_cnt(size_t offset) 225 { 226 struct pcpu *pcpu; 227 u_int count; 228 int i; 229 230 count = *(u_int *)((char *)&vm_cnt + offset); 231 CPU_FOREACH(i) { 232 pcpu = pcpu_find(i); 233 count += *(u_int *)((char *)&pcpu->pc_cnt + offset); 234 } 235 return (count); 236 } 237 238 static int 239 cnt_sysctl(SYSCTL_HANDLER_ARGS) 240 { 241 u_int count; 242 243 count = vm_meter_cnt((char *)arg1 - (char *)&vm_cnt); 244 return (SYSCTL_OUT(req, &count, sizeof(count))); 245 } 246 247 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 248 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 249 "System virtual memory statistics"); 250 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 251 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 252 "VM meter sys stats"); 253 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 254 "VM meter vm stats"); 255 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 256 257 #define VM_STATS(parent, var, descr) \ 258 SYSCTL_PROC(parent, OID_AUTO, var, \ 259 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, \ 260 cnt_sysctl, "IU", descr) 261 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 262 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 263 264 VM_STATS_SYS(v_swtch, "Context switches"); 265 VM_STATS_SYS(v_trap, "Traps"); 266 VM_STATS_SYS(v_syscall, "System calls"); 267 VM_STATS_SYS(v_intr, "Device interrupts"); 268 VM_STATS_SYS(v_soft, "Software interrupts"); 269 VM_STATS_VM(v_vm_faults, "Address memory faults"); 270 VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 271 VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 272 VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 273 VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 274 VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 275 VM_STATS_VM(v_swapin, "Swap pager pageins"); 276 VM_STATS_VM(v_swapout, "Swap pager pageouts"); 277 VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 278 VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 279 VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 280 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 281 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 282 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 283 VM_STATS_VM(v_intrans, "In transit page faults"); 284 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon"); 285 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 286 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 287 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls"); 288 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 289 VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 290 VM_STATS_VM(v_tfree, "Total pages freed"); 291 VM_STATS_VM(v_page_size, "Page size in bytes"); 292 VM_STATS_VM(v_page_count, "Total number of pages in system"); 293 VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 294 VM_STATS_VM(v_free_target, "Pages desired free"); 295 VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 296 VM_STATS_VM(v_free_count, "Free pages"); 297 VM_STATS_VM(v_wire_count, "Wired pages"); 298 VM_STATS_VM(v_active_count, "Active pages"); 299 VM_STATS_VM(v_inactive_target, "Desired inactive pages"); 300 VM_STATS_VM(v_inactive_count, "Inactive pages"); 301 VM_STATS_VM(v_laundry_count, "Pages eligible for laundering"); 302 VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 303 VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 304 VM_STATS_VM(v_forks, "Number of fork() calls"); 305 VM_STATS_VM(v_vforks, "Number of vfork() calls"); 306 VM_STATS_VM(v_rforks, "Number of rfork() calls"); 307 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 308 VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 309 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 310 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 311 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 312 313 #ifdef COMPAT_FREEBSD11 314 /* 315 * Provide compatibility sysctls for the benefit of old utilities which exit 316 * with an error if they cannot be found. 317 */ 318 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD, 319 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 320 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD, 321 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility"); 322 #endif 323