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 - locked by vm_page_queue_mtx 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_cow_faults; /* (p) copy-on-writes faults */ 65 u_int v_cow_optim; /* (p) optimized copy-on-writes faults */ 66 u_int v_zfod; /* (p) pages zero filled on demand */ 67 u_int v_ozfod; /* (p) optimized zero fill pages */ 68 u_int v_swapin; /* (p) swap pager pageins */ 69 u_int v_swapout; /* (p) swap pager pageouts */ 70 u_int v_swappgsin; /* (p) swap pager pages paged in */ 71 u_int v_swappgsout; /* (p) swap pager pages paged out */ 72 u_int v_vnodein; /* (p) vnode pager pageins */ 73 u_int v_vnodeout; /* (p) vnode pager pageouts */ 74 u_int v_vnodepgsin; /* (p) vnode_pager pages paged in */ 75 u_int v_vnodepgsout; /* (p) vnode pager pages paged out */ 76 u_int v_intrans; /* (p) intransit blocking page faults */ 77 u_int v_reactivated; /* (f) pages reactivated from free list */ 78 u_int v_pdwakeups; /* (f) times daemon has awaken from sleep */ 79 u_int v_pdpages; /* (q) pages analyzed by daemon */ 80 81 u_int v_tcached; /* (p) total pages cached */ 82 u_int v_dfree; /* (q) pages freed by daemon */ 83 u_int v_pfree; /* (p) pages freed by exiting processes */ 84 u_int v_tfree; /* (p) total pages freed */ 85 /* 86 * Distribution of page usages. 87 */ 88 u_int v_page_size; /* (c) page size in bytes */ 89 u_int v_page_count; /* (c) total number of pages in system */ 90 u_int v_free_reserved; /* (c) pages reserved for deadlock */ 91 u_int v_free_target; /* (c) pages desired free */ 92 u_int v_free_min; /* (c) pages desired free */ 93 u_int v_free_count; /* (f) pages free */ 94 u_int v_wire_count; /* (a) pages wired down */ 95 u_int v_active_count; /* (q) pages active */ 96 u_int v_inactive_target; /* (c) pages desired inactive */ 97 u_int v_inactive_count; /* (q) pages inactive */ 98 u_int v_cache_count; /* (f) pages on cache queue */ 99 u_int v_cache_min; /* (c) min pages desired on cache queue */ 100 u_int v_cache_max; /* (c) max pages in cached obj */ 101 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */ 102 u_int v_interrupt_free_min; /* (c) reserved pages for int code */ 103 u_int v_free_severe; /* (c) severe page depletion point */ 104 /* 105 * Fork/vfork/rfork activity. 106 */ 107 u_int v_forks; /* (p) fork() calls */ 108 u_int v_vforks; /* (p) vfork() calls */ 109 u_int v_rforks; /* (p) rfork() calls */ 110 u_int v_kthreads; /* (p) fork() calls by kernel */ 111 u_int v_forkpages; /* (p) VM pages affected by fork() */ 112 u_int v_vforkpages; /* (p) VM pages affected by vfork() */ 113 u_int v_rforkpages; /* (p) VM pages affected by rfork() */ 114 u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */ 115 }; 116 #ifdef _KERNEL 117 118 extern struct vmmeter cnt; 119 120 /* 121 * Return TRUE if we are under our severe low-free-pages threshold 122 * 123 * This routine is typically used at the user<->system interface to determine 124 * whether we need to block in order to avoid a low memory deadlock. 125 */ 126 127 static __inline 128 int 129 vm_page_count_severe(void) 130 { 131 return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count)); 132 } 133 134 /* 135 * Return TRUE if we are under our minimum low-free-pages threshold. 136 * 137 * This routine is typically used within the system to determine whether 138 * we can execute potentially very expensive code in terms of memory. It 139 * is also used by the pageout daemon to calculate when to sleep, when 140 * to wake waiters up, and when (after making a pass) to become more 141 * desparate. 142 */ 143 144 static __inline 145 int 146 vm_page_count_min(void) 147 { 148 return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count)); 149 } 150 151 /* 152 * Return TRUE if we have not reached our free page target during 153 * free page recovery operations. 154 */ 155 156 static __inline 157 int 158 vm_page_count_target(void) 159 { 160 return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count)); 161 } 162 163 /* 164 * Return the number of pages we need to free-up or cache 165 * A positive number indicates that we do not have enough free pages. 166 */ 167 168 static __inline 169 int 170 vm_paging_target(void) 171 { 172 return ( 173 (cnt.v_free_target + cnt.v_cache_min) - 174 (cnt.v_free_count + cnt.v_cache_count) 175 ); 176 } 177 178 /* 179 * Returns TRUE if the pagedaemon needs to be woken up. 180 */ 181 182 static __inline 183 int 184 vm_paging_needed(void) 185 { 186 return ( 187 (cnt.v_free_reserved + cnt.v_cache_min) > 188 (cnt.v_free_count + cnt.v_cache_count) 189 ); 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