1 /*- 2 * Copyright (c) 1982, 1986, 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 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94 30 * $FreeBSD$ 31 */ 32 33 #ifndef _SYS_VMMETER_H_ 34 #define _SYS_VMMETER_H_ 35 36 /* 37 * This value is used by ps(1) to change sleep state flag from 'S' to 38 * 'I' and by the sched process to set the alarm clock. 39 */ 40 #define MAXSLP 20 41 42 /* 43 * System wide statistics counters. 44 * Locking: 45 * a - locked by atomic operations 46 * c - constant after initialization 47 * f - locked by vm_page_queue_free_mtx 48 * p - locked by being in the PCPU and atomicity respect to interrupts 49 * q - changes are synchronized by the corresponding vm_pagequeue lock 50 */ 51 struct vmmeter { 52 /* 53 * General system activity. 54 */ 55 u_int v_swtch; /* (p) context switches */ 56 u_int v_trap; /* (p) calls to trap */ 57 u_int v_syscall; /* (p) calls to syscall() */ 58 u_int v_intr; /* (p) device interrupts */ 59 u_int v_soft; /* (p) software interrupts */ 60 /* 61 * Virtual memory activity. 62 */ 63 u_int v_vm_faults; /* (p) address memory faults */ 64 u_int v_io_faults; /* (p) page faults requiring I/O */ 65 u_int v_cow_faults; /* (p) copy-on-writes faults */ 66 u_int v_cow_optim; /* (p) optimized copy-on-writes faults */ 67 u_int v_zfod; /* (p) pages zero filled on demand */ 68 u_int v_ozfod; /* (p) optimized zero fill pages */ 69 u_int v_swapin; /* (p) swap pager pageins */ 70 u_int v_swapout; /* (p) swap pager pageouts */ 71 u_int v_swappgsin; /* (p) swap pager pages paged in */ 72 u_int v_swappgsout; /* (p) swap pager pages paged out */ 73 u_int v_vnodein; /* (p) vnode pager pageins */ 74 u_int v_vnodeout; /* (p) vnode pager pageouts */ 75 u_int v_vnodepgsin; /* (p) vnode_pager pages paged in */ 76 u_int v_vnodepgsout; /* (p) vnode pager pages paged out */ 77 u_int v_intrans; /* (p) intransit blocking page faults */ 78 u_int v_reactivated; /* (f) pages reactivated from free list */ 79 u_int v_pdwakeups; /* (f) times daemon has awaken from sleep */ 80 u_int v_pdpages; /* (p) pages analyzed by daemon */ 81 82 u_int v_tcached; /* (p) total pages cached */ 83 u_int v_dfree; /* (p) pages freed by daemon */ 84 u_int v_pfree; /* (p) pages freed by exiting processes */ 85 u_int v_tfree; /* (p) total pages freed */ 86 /* 87 * Distribution of page usages. 88 */ 89 u_int v_page_size; /* (c) page size in bytes */ 90 u_int v_page_count; /* (c) total number of pages in system */ 91 u_int v_free_reserved; /* (c) pages reserved for deadlock */ 92 u_int v_free_target; /* (c) pages desired free */ 93 u_int v_free_min; /* (c) pages desired free */ 94 u_int v_free_count; /* (f) pages free */ 95 u_int v_wire_count; /* (a) pages wired down */ 96 u_int v_active_count; /* (q) pages active */ 97 u_int v_inactive_target; /* (c) pages desired inactive */ 98 u_int v_inactive_count; /* (q) pages inactive */ 99 u_int v_cache_count; /* (f) pages on cache queue */ 100 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */ 101 u_int v_interrupt_free_min; /* (c) reserved pages for int code */ 102 u_int v_free_severe; /* (c) severe page depletion point */ 103 /* 104 * Fork/vfork/rfork activity. 105 */ 106 u_int v_forks; /* (p) fork() calls */ 107 u_int v_vforks; /* (p) vfork() calls */ 108 u_int v_rforks; /* (p) rfork() calls */ 109 u_int v_kthreads; /* (p) fork() calls by kernel */ 110 u_int v_forkpages; /* (p) VM pages affected by fork() */ 111 u_int v_vforkpages; /* (p) VM pages affected by vfork() */ 112 u_int v_rforkpages; /* (p) VM pages affected by rfork() */ 113 u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */ 114 u_int v_spare[2]; 115 }; 116 #ifdef _KERNEL 117 118 extern struct vmmeter vm_cnt; 119 120 extern int vm_pageout_wakeup_thresh; 121 122 /* 123 * Return TRUE if we are under our severe low-free-pages threshold 124 * 125 * This routine is typically used at the user<->system interface to determine 126 * whether we need to block in order to avoid a low memory deadlock. 127 */ 128 129 static __inline 130 int 131 vm_page_count_severe(void) 132 { 133 return (vm_cnt.v_free_severe > (vm_cnt.v_free_count + 134 vm_cnt.v_cache_count)); 135 } 136 137 /* 138 * Return TRUE if we are under our minimum low-free-pages threshold. 139 * 140 * This routine is typically used within the system to determine whether 141 * we can execute potentially very expensive code in terms of memory. It 142 * is also used by the pageout daemon to calculate when to sleep, when 143 * to wake waiters up, and when (after making a pass) to become more 144 * desparate. 145 */ 146 147 static __inline 148 int 149 vm_page_count_min(void) 150 { 151 return (vm_cnt.v_free_min > (vm_cnt.v_free_count + vm_cnt.v_cache_count)); 152 } 153 154 /* 155 * Return TRUE if we have not reached our free page target during 156 * free page recovery operations. 157 */ 158 159 static __inline 160 int 161 vm_page_count_target(void) 162 { 163 return (vm_cnt.v_free_target > (vm_cnt.v_free_count + 164 vm_cnt.v_cache_count)); 165 } 166 167 /* 168 * Return the number of pages we need to free-up or cache 169 * A positive number indicates that we do not have enough free pages. 170 */ 171 172 static __inline 173 int 174 vm_paging_target(void) 175 { 176 return (vm_cnt.v_free_target - (vm_cnt.v_free_count + 177 vm_cnt.v_cache_count)); 178 } 179 180 /* 181 * Returns TRUE if the pagedaemon needs to be woken up. 182 */ 183 184 static __inline 185 int 186 vm_paging_needed(void) 187 { 188 return (vm_cnt.v_free_count + vm_cnt.v_cache_count < 189 vm_pageout_wakeup_thresh); 190 } 191 192 #endif 193 194 /* systemwide totals computed every five seconds */ 195 struct vmtotal { 196 int16_t t_rq; /* length of the run queue */ 197 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */ 198 int16_t t_pw; /* jobs in page wait */ 199 int16_t t_sl; /* jobs sleeping in core */ 200 int16_t t_sw; /* swapped out runnable/short block jobs */ 201 int32_t t_vm; /* total virtual memory */ 202 int32_t t_avm; /* active virtual memory */ 203 int32_t t_rm; /* total real memory in use */ 204 int32_t t_arm; /* active real memory */ 205 int32_t t_vmshr; /* shared virtual memory */ 206 int32_t t_avmshr; /* active shared virtual memory */ 207 int32_t t_rmshr; /* shared real memory */ 208 int32_t t_armshr; /* active shared real memory */ 209 int32_t t_free; /* free memory pages */ 210 }; 211 212 #endif 213