1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94 32 * $FreeBSD$ 33 */ 34 35 #ifndef _SYS_VMMETER_H_ 36 #define _SYS_VMMETER_H_ 37 38 /* 39 * This value is used by ps(1) to change sleep state flag from 'S' to 40 * 'I' and by the sched process to set the alarm clock. 41 */ 42 #define MAXSLP 20 43 44 struct vmtotal { 45 uint64_t t_vm; /* total virtual memory */ 46 uint64_t t_avm; /* active virtual memory */ 47 uint64_t t_rm; /* total real memory in use */ 48 uint64_t t_arm; /* active real memory */ 49 uint64_t t_vmshr; /* shared virtual memory */ 50 uint64_t t_avmshr; /* active shared virtual memory */ 51 uint64_t t_rmshr; /* shared real memory */ 52 uint64_t t_armshr; /* active shared real memory */ 53 uint64_t t_free; /* free memory pages */ 54 int16_t t_rq; /* length of the run queue */ 55 int16_t t_dw; /* threads in ``disk wait'' (neg 56 priority) */ 57 int16_t t_pw; /* threads in page wait */ 58 int16_t t_sl; /* threads sleeping in core */ 59 int16_t t_sw; /* swapped out runnable/short 60 block threads */ 61 uint16_t t_pad[3]; 62 }; 63 64 #if defined(_KERNEL) || defined(_WANT_VMMETER) 65 #include <sys/counter.h> 66 67 #ifdef _KERNEL 68 #define VMMETER_ALIGNED __aligned(CACHE_LINE_SIZE) 69 #else 70 #define VMMETER_ALIGNED 71 #endif 72 73 /* 74 * System wide statistics counters. 75 * Locking: 76 * c - constant after initialization 77 * p - uses counter(9) 78 */ 79 struct vmmeter { 80 /* 81 * General system activity. 82 */ 83 counter_u64_t v_swtch; /* (p) context switches */ 84 counter_u64_t v_trap; /* (p) calls to trap */ 85 counter_u64_t v_syscall; /* (p) calls to syscall() */ 86 counter_u64_t v_intr; /* (p) device interrupts */ 87 counter_u64_t v_soft; /* (p) software interrupts */ 88 /* 89 * Virtual memory activity. 90 */ 91 counter_u64_t v_vm_faults; /* (p) address memory faults */ 92 counter_u64_t v_io_faults; /* (p) page faults requiring I/O */ 93 counter_u64_t v_cow_faults; /* (p) copy-on-writes faults */ 94 counter_u64_t v_cow_optim; /* (p) optimized COW faults */ 95 counter_u64_t v_zfod; /* (p) pages zero filled on demand */ 96 counter_u64_t v_ozfod; /* (p) optimized zero fill pages */ 97 counter_u64_t v_swapin; /* (p) swap pager pageins */ 98 counter_u64_t v_swapout; /* (p) swap pager pageouts */ 99 counter_u64_t v_swappgsin; /* (p) swap pager pages paged in */ 100 counter_u64_t v_swappgsout; /* (p) swap pager pages paged out */ 101 counter_u64_t v_vnodein; /* (p) vnode pager pageins */ 102 counter_u64_t v_vnodeout; /* (p) vnode pager pageouts */ 103 counter_u64_t v_vnodepgsin; /* (p) vnode_pager pages paged in */ 104 counter_u64_t v_vnodepgsout; /* (p) vnode pager pages paged out */ 105 counter_u64_t v_intrans; /* (p) intransit blocking page faults */ 106 counter_u64_t v_reactivated; /* (p) reactivated by the pagedaemon */ 107 counter_u64_t v_pdwakeups; /* (p) times daemon has awaken */ 108 counter_u64_t v_pdpages; /* (p) pages analyzed by daemon */ 109 counter_u64_t v_pdshortfalls; /* (p) page reclamation shortfalls */ 110 111 counter_u64_t v_dfree; /* (p) pages freed by daemon */ 112 counter_u64_t v_pfree; /* (p) pages freed by processes */ 113 counter_u64_t v_tfree; /* (p) total pages freed */ 114 /* 115 * Fork/vfork/rfork activity. 116 */ 117 counter_u64_t v_forks; /* (p) fork() calls */ 118 counter_u64_t v_vforks; /* (p) vfork() calls */ 119 counter_u64_t v_rforks; /* (p) rfork() calls */ 120 counter_u64_t v_kthreads; /* (p) fork() calls by kernel */ 121 counter_u64_t v_forkpages; /* (p) pages affected by fork() */ 122 counter_u64_t v_vforkpages; /* (p) pages affected by vfork() */ 123 counter_u64_t v_rforkpages; /* (p) pages affected by rfork() */ 124 counter_u64_t v_kthreadpages; /* (p) ... and by kernel fork() */ 125 counter_u64_t v_wire_count; /* (p) pages wired down */ 126 #define VM_METER_NCOUNTERS \ 127 (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t)) 128 /* 129 * Distribution of page usages. 130 */ 131 u_int v_page_size; /* (c) page size in bytes */ 132 u_int v_page_count; /* (c) total number of pages in system */ 133 u_int v_free_reserved; /* (c) pages reserved for deadlock */ 134 u_int v_free_target; /* (c) pages desired free */ 135 u_int v_free_min; /* (c) pages desired free */ 136 u_int v_inactive_target; /* (c) pages desired inactive */ 137 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */ 138 u_int v_interrupt_free_min; /* (c) reserved pages for int code */ 139 u_int v_free_severe; /* (c) severe page depletion point */ 140 }; 141 #endif /* _KERNEL || _WANT_VMMETER */ 142 143 #ifdef _KERNEL 144 145 #include <sys/domainset.h> 146 147 extern struct vmmeter vm_cnt; 148 extern domainset_t all_domains; 149 extern domainset_t vm_min_domains; 150 extern domainset_t vm_severe_domains; 151 152 #define VM_CNT_ADD(var, x) counter_u64_add(vm_cnt.var, x) 153 #define VM_CNT_INC(var) VM_CNT_ADD(var, 1) 154 #define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var) 155 156 static inline void 157 vm_wire_add(int cnt) 158 { 159 160 VM_CNT_ADD(v_wire_count, cnt); 161 } 162 163 static inline void 164 vm_wire_sub(int cnt) 165 { 166 167 VM_CNT_ADD(v_wire_count, -cnt); 168 } 169 170 u_int vm_free_count(void); 171 static inline u_int 172 vm_wire_count(void) 173 { 174 175 return (VM_CNT_FETCH(v_wire_count)); 176 } 177 178 /* 179 * Return TRUE if we are under our severe low-free-pages threshold 180 * 181 * These routines are typically used at the user<->system interface to determine 182 * whether we need to block in order to avoid a low memory deadlock. 183 */ 184 static inline int 185 vm_page_count_severe(void) 186 { 187 188 return (!DOMAINSET_EMPTY(&vm_severe_domains)); 189 } 190 191 static inline int 192 vm_page_count_severe_domain(int domain) 193 { 194 195 return (DOMAINSET_ISSET(domain, &vm_severe_domains)); 196 } 197 198 static inline int 199 vm_page_count_severe_set(const domainset_t *mask) 200 { 201 202 return (DOMAINSET_SUBSET(&vm_severe_domains, mask)); 203 } 204 205 /* 206 * Return TRUE if we are under our minimum low-free-pages threshold. 207 * 208 * These routines are typically used within the system to determine whether 209 * we can execute potentially very expensive code in terms of memory. It 210 * is also used by the pageout daemon to calculate when to sleep, when 211 * to wake waiters up, and when (after making a pass) to become more 212 * desperate. 213 */ 214 static inline int 215 vm_page_count_min(void) 216 { 217 218 return (!DOMAINSET_EMPTY(&vm_min_domains)); 219 } 220 221 static inline int 222 vm_page_count_min_domain(int domain) 223 { 224 225 return (DOMAINSET_ISSET(domain, &vm_min_domains)); 226 } 227 228 static inline int 229 vm_page_count_min_set(const domainset_t *mask) 230 { 231 232 return (DOMAINSET_SUBSET(&vm_min_domains, mask)); 233 } 234 235 #endif /* _KERNEL */ 236 #endif /* _SYS_VMMETER_H_ */ 237