FreeBSD/Linux Kernel Cross Reference
sys/sys/vmmeter.h
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: releng/11.1/sys/sys/vmmeter.h 320693 2017-07-05 19:24:53Z markj $
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; /* (p) pages reactivated by the pagedaemon */
79 u_int v_pdwakeups; /* (p) times daemon has awaken from sleep */
80 u_int v_pdpages; /* (p) pages analyzed by daemon */
81 u_int v_pdshortfalls; /* (p) page reclamation shortfalls */
82
83 u_int v_tcached; /* (p) total pages cached */
84 u_int v_dfree; /* (p) pages freed by daemon */
85 u_int v_pfree; /* (p) pages freed by exiting processes */
86 u_int v_tfree; /* (p) total pages freed */
87 /*
88 * Distribution of page usages.
89 */
90 u_int v_page_size; /* (c) page size in bytes */
91 u_int v_page_count; /* (c) total number of pages in system */
92 u_int v_free_reserved; /* (c) pages reserved for deadlock */
93 u_int v_free_target; /* (c) pages desired free */
94 u_int v_free_min; /* (c) pages desired free */
95 u_int v_free_count; /* (f) pages free */
96 u_int v_wire_count; /* (a) pages wired down */
97 u_int v_active_count; /* (q) pages active */
98 u_int v_inactive_target; /* (c) pages desired inactive */
99 u_int v_inactive_count; /* (q) pages inactive */
100 u_int v_laundry_count; /* (q) pages eligible for laundering */
101 u_int v_cache_count; /* (f) pages on cache queue */
102 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
103 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
104 u_int v_free_severe; /* (c) severe page depletion point */
105 /*
106 * Fork/vfork/rfork activity.
107 */
108 u_int v_forks; /* (p) fork() calls */
109 u_int v_vforks; /* (p) vfork() calls */
110 u_int v_rforks; /* (p) rfork() calls */
111 u_int v_kthreads; /* (p) fork() calls by kernel */
112 u_int v_forkpages; /* (p) VM pages affected by fork() */
113 u_int v_vforkpages; /* (p) VM pages affected by vfork() */
114 u_int v_rforkpages; /* (p) VM pages affected by rfork() */
115 u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */
116 };
117 #ifdef _KERNEL
118
119 extern struct vmmeter vm_cnt;
120
121 extern u_int vm_pageout_wakeup_thresh;
122
123 /*
124 * Return TRUE if we are under our severe low-free-pages threshold
125 *
126 * This routine is typically used at the user<->system interface to determine
127 * whether we need to block in order to avoid a low memory deadlock.
128 */
129 static inline int
130 vm_page_count_severe(void)
131 {
132
133 return (vm_cnt.v_free_severe > vm_cnt.v_free_count);
134 }
135
136 /*
137 * Return TRUE if we are under our minimum low-free-pages threshold.
138 *
139 * This routine is typically used within the system to determine whether
140 * we can execute potentially very expensive code in terms of memory. It
141 * is also used by the pageout daemon to calculate when to sleep, when
142 * to wake waiters up, and when (after making a pass) to become more
143 * desperate.
144 */
145 static inline int
146 vm_page_count_min(void)
147 {
148
149 return (vm_cnt.v_free_min > vm_cnt.v_free_count);
150 }
151
152 /*
153 * Return TRUE if we have not reached our free page target during
154 * free page recovery operations.
155 */
156 static inline int
157 vm_page_count_target(void)
158 {
159
160 return (vm_cnt.v_free_target > vm_cnt.v_free_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 static inline int
168 vm_paging_target(void)
169 {
170
171 return (vm_cnt.v_free_target - vm_cnt.v_free_count);
172 }
173
174 /*
175 * Returns TRUE if the pagedaemon needs to be woken up.
176 */
177 static inline int
178 vm_paging_needed(void)
179 {
180
181 return (vm_cnt.v_free_count < vm_pageout_wakeup_thresh);
182 }
183
184 /*
185 * Return the number of pages we need to launder.
186 * A positive number indicates that we have a shortfall of clean pages.
187 */
188 static inline int
189 vm_laundry_target(void)
190 {
191
192 return (vm_paging_target());
193 }
194
195 /*
196 * Obtain the value of a per-CPU counter.
197 */
198 #define VM_METER_PCPU_CNT(member) \
199 vm_meter_cnt(__offsetof(struct vmmeter, member))
200
201 u_int vm_meter_cnt(size_t);
202
203 #endif
204
205 /* systemwide totals computed every five seconds */
206 struct vmtotal {
207 int16_t t_rq; /* length of the run queue */
208 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
209 int16_t t_pw; /* jobs in page wait */
210 int16_t t_sl; /* jobs sleeping in core */
211 int16_t t_sw; /* swapped out runnable/short block jobs */
212 int32_t t_vm; /* total virtual memory */
213 int32_t t_avm; /* active virtual memory */
214 int32_t t_rm; /* total real memory in use */
215 int32_t t_arm; /* active real memory */
216 int32_t t_vmshr; /* shared virtual memory */
217 int32_t t_avmshr; /* active shared virtual memory */
218 int32_t t_rmshr; /* shared real memory */
219 int32_t t_armshr; /* active shared real memory */
220 int32_t t_free; /* free memory pages */
221 };
222
223 #endif
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