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 * 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 * @(#)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 /* Systemwide totals computed every five seconds. */ 43 struct vmtotal { 44 int16_t t_rq; /* length of the run queue */ 45 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */ 46 int16_t t_pw; /* jobs in page wait */ 47 int16_t t_sl; /* jobs sleeping in core */ 48 int16_t t_sw; /* swapped out runnable/short block jobs */ 49 int32_t t_vm; /* total virtual memory */ 50 int32_t t_avm; /* active virtual memory */ 51 int32_t t_rm; /* total real memory in use */ 52 int32_t t_arm; /* active real memory */ 53 int32_t t_vmshr; /* shared virtual memory */ 54 int32_t t_avmshr; /* active shared virtual memory */ 55 int32_t t_rmshr; /* shared real memory */ 56 int32_t t_armshr; /* active shared real memory */ 57 int32_t t_free; /* free memory pages */ 58 }; 59 60 #if defined(_KERNEL) || defined(_WANT_VMMETER) 61 #include <sys/counter.h> 62 63 /* 64 * System wide statistics counters. 65 * Locking: 66 * a - locked by atomic operations 67 * c - constant after initialization 68 * f - locked by vm_page_queue_free_mtx 69 * p - uses counter(9) 70 * q - changes are synchronized by the corresponding vm_pagequeue lock 71 */ 72 struct vmmeter { 73 /* 74 * General system activity. 75 */ 76 counter_u64_t v_swtch; /* (p) context switches */ 77 counter_u64_t v_trap; /* (p) calls to trap */ 78 counter_u64_t v_syscall; /* (p) calls to syscall() */ 79 counter_u64_t v_intr; /* (p) device interrupts */ 80 counter_u64_t v_soft; /* (p) software interrupts */ 81 /* 82 * Virtual memory activity. 83 */ 84 counter_u64_t v_vm_faults; /* (p) address memory faults */ 85 counter_u64_t v_io_faults; /* (p) page faults requiring I/O */ 86 counter_u64_t v_cow_faults; /* (p) copy-on-writes faults */ 87 counter_u64_t v_cow_optim; /* (p) optimized COW faults */ 88 counter_u64_t v_zfod; /* (p) pages zero filled on demand */ 89 counter_u64_t v_ozfod; /* (p) optimized zero fill pages */ 90 counter_u64_t v_swapin; /* (p) swap pager pageins */ 91 counter_u64_t v_swapout; /* (p) swap pager pageouts */ 92 counter_u64_t v_swappgsin; /* (p) swap pager pages paged in */ 93 counter_u64_t v_swappgsout; /* (p) swap pager pages paged out */ 94 counter_u64_t v_vnodein; /* (p) vnode pager pageins */ 95 counter_u64_t v_vnodeout; /* (p) vnode pager pageouts */ 96 counter_u64_t v_vnodepgsin; /* (p) vnode_pager pages paged in */ 97 counter_u64_t v_vnodepgsout; /* (p) vnode pager pages paged out */ 98 counter_u64_t v_intrans; /* (p) intransit blocking page faults */ 99 counter_u64_t v_reactivated; /* (p) reactivated by the pagedaemon */ 100 counter_u64_t v_pdwakeups; /* (p) times daemon has awaken */ 101 counter_u64_t v_pdpages; /* (p) pages analyzed by daemon */ 102 counter_u64_t v_pdshortfalls; /* (p) page reclamation shortfalls */ 103 104 counter_u64_t v_dfree; /* (p) pages freed by daemon */ 105 counter_u64_t v_pfree; /* (p) pages freed by processes */ 106 counter_u64_t v_tfree; /* (p) total pages freed */ 107 /* 108 * Fork/vfork/rfork activity. 109 */ 110 counter_u64_t v_forks; /* (p) fork() calls */ 111 counter_u64_t v_vforks; /* (p) vfork() calls */ 112 counter_u64_t v_rforks; /* (p) rfork() calls */ 113 counter_u64_t v_kthreads; /* (p) fork() calls by kernel */ 114 counter_u64_t v_forkpages; /* (p) pages affected by fork() */ 115 counter_u64_t v_vforkpages; /* (p) pages affected by vfork() */ 116 counter_u64_t v_rforkpages; /* (p) pages affected by rfork() */ 117 counter_u64_t v_kthreadpages; /* (p) ... and by kernel fork() */ 118 #define VM_METER_NCOUNTERS \ 119 (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t)) 120 /* 121 * Distribution of page usages. 122 */ 123 u_int v_page_size; /* (c) page size in bytes */ 124 u_int v_page_count; /* (c) total number of pages in system */ 125 u_int v_free_reserved; /* (c) pages reserved for deadlock */ 126 u_int v_free_target; /* (c) pages desired free */ 127 u_int v_free_min; /* (c) pages desired free */ 128 u_int v_free_count; /* (f) pages free */ 129 u_int v_wire_count; /* (a) pages wired down */ 130 u_int v_active_count; /* (q) pages active */ 131 u_int v_inactive_target; /* (c) pages desired inactive */ 132 u_int v_inactive_count; /* (q) pages inactive */ 133 u_int v_laundry_count; /* (q) pages eligible for laundering */ 134 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */ 135 u_int v_interrupt_free_min; /* (c) reserved pages for int code */ 136 u_int v_free_severe; /* (c) severe page depletion point */ 137 }; 138 #endif /* _KERNEL || _WANT_VMMETER */ 139 140 #ifdef _KERNEL 141 142 extern struct vmmeter vm_cnt; 143 extern u_int vm_pageout_wakeup_thresh; 144 145 #define VM_CNT_ADD(var, x) counter_u64_add(vm_cnt.var, x) 146 #define VM_CNT_INC(var) VM_CNT_ADD(var, 1) 147 #define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var) 148 149 /* 150 * Return TRUE if we are under our severe low-free-pages threshold 151 * 152 * This routine is typically used at the user<->system interface to determine 153 * whether we need to block in order to avoid a low memory deadlock. 154 */ 155 static inline int 156 vm_page_count_severe(void) 157 { 158 159 return (vm_cnt.v_free_severe > vm_cnt.v_free_count); 160 } 161 162 /* 163 * Return TRUE if we are under our minimum low-free-pages threshold. 164 * 165 * This routine is typically used within the system to determine whether 166 * we can execute potentially very expensive code in terms of memory. It 167 * is also used by the pageout daemon to calculate when to sleep, when 168 * to wake waiters up, and when (after making a pass) to become more 169 * desperate. 170 */ 171 static inline int 172 vm_page_count_min(void) 173 { 174 175 return (vm_cnt.v_free_min > vm_cnt.v_free_count); 176 } 177 178 /* 179 * Return TRUE if we have not reached our free page target during 180 * free page recovery operations. 181 */ 182 static inline int 183 vm_page_count_target(void) 184 { 185 186 return (vm_cnt.v_free_target > vm_cnt.v_free_count); 187 } 188 189 /* 190 * Return the number of pages we need to free-up or cache 191 * A positive number indicates that we do not have enough free pages. 192 */ 193 static inline int 194 vm_paging_target(void) 195 { 196 197 return (vm_cnt.v_free_target - vm_cnt.v_free_count); 198 } 199 200 /* 201 * Returns TRUE if the pagedaemon needs to be woken up. 202 */ 203 static inline int 204 vm_paging_needed(void) 205 { 206 207 return (vm_cnt.v_free_count < vm_pageout_wakeup_thresh); 208 } 209 210 /* 211 * Return the number of pages we need to launder. 212 * A positive number indicates that we have a shortfall of clean pages. 213 */ 214 static inline int 215 vm_laundry_target(void) 216 { 217 218 return (vm_paging_target()); 219 } 220 #endif /* _KERNEL */ 221 #endif /* _SYS_VMMETER_H_ */ 222