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