master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
32 */
33
34#ifndef _SYS_VMMETER_H_
35#define _SYS_VMMETER_H_
36
37/*
38 * This value is used by ps(1) to change sleep state flag from 'S' to
39 * 'I' and by the sched process to set the alarm clock.
40 */
41#define MAXSLP 20
42
43struct vmtotal {
44 uint64_t t_vm; /* total virtual memory */
45 uint64_t t_avm; /* active virtual memory */
46 uint64_t t_rm; /* total real memory in use */
47 uint64_t t_arm; /* active real memory */
48 uint64_t t_vmshr; /* shared virtual memory */
49 uint64_t t_avmshr; /* active shared virtual memory */
50 uint64_t t_rmshr; /* shared real memory */
51 uint64_t t_armshr; /* active shared real memory */
52 uint64_t t_free; /* free memory pages */
53 int16_t t_rq; /* length of the run queue */
54 int16_t t_dw; /* threads in ``disk wait'' (neg
55 priority) */
56 int16_t t_pw; /* threads in page wait */
57 int16_t t_sl; /* threads sleeping in core */
58 int16_t t_sw; /* swapped out runnable/short
59 block threads */
60 uint16_t t_pad[3];
61};
62
63#if defined(_KERNEL) || defined(_WANT_VMMETER)
64#include <sys/counter.h>
65
66#ifdef _KERNEL
67#define VMMETER_ALIGNED __aligned(CACHE_LINE_SIZE)
68#else
69#define VMMETER_ALIGNED
70#endif
71
72/*
73 * System wide statistics counters.
74 * Locking:
75 * c - constant after initialization
76 * p - uses counter(9)
77 */
78struct vmmeter {
79 /*
80 * General system activity.
81 */
82 counter_u64_t v_swtch; /* (p) context switches */
83 counter_u64_t v_trap; /* (p) calls to trap */
84 counter_u64_t v_syscall; /* (p) calls to syscall() */
85 counter_u64_t v_intr; /* (p) device interrupts */
86 counter_u64_t v_soft; /* (p) software interrupts */
87 /*
88 * Virtual memory activity.
89 */
90 counter_u64_t v_vm_faults; /* (p) address memory faults */
91 counter_u64_t v_io_faults; /* (p) page faults requiring I/O */
92 counter_u64_t v_cow_faults; /* (p) copy-on-writes faults */
93 counter_u64_t v_cow_optim; /* (p) optimized COW faults */
94 counter_u64_t v_zfod; /* (p) pages zero filled on demand */
95 counter_u64_t v_ozfod; /* (p) optimized zero fill pages */
96 counter_u64_t v_swapin; /* (p) swap pager pageins */
97 counter_u64_t v_swapout; /* (p) swap pager pageouts */
98 counter_u64_t v_swappgsin; /* (p) swap pager pages paged in */
99 counter_u64_t v_swappgsout; /* (p) swap pager pages paged out */
100 counter_u64_t v_vnodein; /* (p) vnode pager pageins */
101 counter_u64_t v_vnodeout; /* (p) vnode pager pageouts */
102 counter_u64_t v_vnodepgsin; /* (p) vnode_pager pages paged in */
103 counter_u64_t v_vnodepgsout; /* (p) vnode pager pages paged out */
104 counter_u64_t v_intrans; /* (p) intransit blocking page faults */
105 counter_u64_t v_reactivated; /* (p) reactivated by the pagedaemon */
106 counter_u64_t v_pdwakeups; /* (p) times daemon has awaken */
107 counter_u64_t v_pdpages; /* (p) pages analyzed by daemon */
108 counter_u64_t v_pdshortfalls; /* (p) page reclamation shortfalls */
109
110 counter_u64_t v_dfree; /* (p) pages freed by daemon */
111 counter_u64_t v_pfree; /* (p) pages freed by processes */
112 counter_u64_t v_tfree; /* (p) total pages freed */
113 /*
114 * Fork/vfork/rfork activity.
115 */
116 counter_u64_t v_forks; /* (p) fork() calls */
117 counter_u64_t v_vforks; /* (p) vfork() calls */
118 counter_u64_t v_rforks; /* (p) rfork() calls */
119 counter_u64_t v_kthreads; /* (p) fork() calls by kernel */
120 counter_u64_t v_forkpages; /* (p) pages affected by fork() */
121 counter_u64_t v_vforkpages; /* (p) pages affected by vfork() */
122 counter_u64_t v_rforkpages; /* (p) pages affected by rfork() */
123 counter_u64_t v_kthreadpages; /* (p) ... and by kernel fork() */
124 counter_u64_t v_wire_count; /* (p) pages wired down */
125#define VM_METER_NCOUNTERS \
126 (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
127 /*
128 * Distribution of page usages.
129 */
130 u_int v_page_size; /* (c) page size in bytes */
131 u_int v_page_count; /* (c) total number of pages in system */
132 u_int v_free_reserved; /* (c) pages reserved for deadlock */
133 u_int v_free_target; /* (c) pages desired free */
134 u_int v_free_min; /* (c) pages desired free */
135 u_int v_inactive_target; /* (c) pages desired inactive */
136 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
137 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
138 u_int v_free_severe; /* (c) severe page depletion point */
139};
140#endif /* _KERNEL || _WANT_VMMETER */
141
142#ifdef _KERNEL
143
144#include <sys/domainset.h>
145
146extern struct vmmeter vm_cnt;
147extern domainset_t all_domains;
148extern domainset_t vm_min_domains;
149extern domainset_t vm_severe_domains;
150
151#define VM_CNT_ADD(var, x) counter_u64_add(vm_cnt.var, x)
152#define VM_CNT_INC(var) VM_CNT_ADD(var, 1)
153#define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var)
154
155extern u_long vm_user_wire_count;
156
157static inline void
158vm_wire_add(int cnt)
159{
160
161 VM_CNT_ADD(v_wire_count, cnt);
162}
163
164static inline void
165vm_wire_sub(int cnt)
166{
167
168 VM_CNT_ADD(v_wire_count, -cnt);
169}
170
171u_int vm_free_count(void);
172static inline u_int
173vm_wire_count(void)
174{
175
176 return (VM_CNT_FETCH(v_wire_count));
177}
178
179/*
180 * Return TRUE if we are under our severe low-free-pages threshold
181 *
182 * These routines are typically used at the user<->system interface to determine
183 * whether we need to block in order to avoid a low memory deadlock.
184 */
185static inline int
186vm_page_count_severe(void)
187{
188
189 return (!DOMAINSET_EMPTY(&vm_severe_domains));
190}
191
192static inline int
193vm_page_count_severe_domain(int domain)
194{
195
196 return (DOMAINSET_ISSET(domain, &vm_severe_domains));
197}
198
199static inline int
200vm_page_count_severe_set(const domainset_t *mask)
201{
202
203 return (DOMAINSET_SUBSET(&vm_severe_domains, mask));
204}
205
206/*
207 * Return TRUE if we are under our minimum low-free-pages threshold.
208 *
209 * These routines are typically used within the system to determine whether
210 * we can execute potentially very expensive code in terms of memory. It
211 * is also used by the pageout daemon to calculate when to sleep, when
212 * to wake waiters up, and when (after making a pass) to become more
213 * desperate.
214 */
215static inline int
216vm_page_count_min(void)
217{
218
219 return (!DOMAINSET_EMPTY(&vm_min_domains));
220}
221
222static inline int
223vm_page_count_min_domain(int domain)
224{
225
226 return (DOMAINSET_ISSET(domain, &vm_min_domains));
227}
228
229static inline int
230vm_page_count_min_set(const domainset_t *mask)
231{
232
233 return (DOMAINSET_SUBSET(&vm_min_domains, mask));
234}
235
236#endif /* _KERNEL */
237#endif /* _SYS_VMMETER_H_ */