FreeBSD/Linux Kernel Cross Reference
sys/sys/vmmeter.h
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 * $FreeBSD$
33 */
34
35 #ifndef _SYS_VMMETER_H_
36 #define _SYS_VMMETER_H_
37
38 /*
39 * This value is used by ps(1) to change sleep state flag from 'S' to
40 * 'I' and by the sched process to set the alarm clock.
41 */
42 #define MAXSLP 20
43
44 struct vmtotal {
45 uint64_t t_vm; /* total virtual memory */
46 uint64_t t_avm; /* active virtual memory */
47 uint64_t t_rm; /* total real memory in use */
48 uint64_t t_arm; /* active real memory */
49 uint64_t t_vmshr; /* shared virtual memory */
50 uint64_t t_avmshr; /* active shared virtual memory */
51 uint64_t t_rmshr; /* shared real memory */
52 uint64_t t_armshr; /* active shared real memory */
53 uint64_t t_free; /* free memory pages */
54 int16_t t_rq; /* length of the run queue */
55 int16_t t_dw; /* threads in ``disk wait'' (neg
56 priority) */
57 int16_t t_pw; /* threads in page wait */
58 int16_t t_sl; /* threads sleeping in core */
59 int16_t t_sw; /* swapped out runnable/short
60 block threads */
61 uint16_t t_pad[3];
62 };
63
64 #if defined(_KERNEL) || defined(_WANT_VMMETER)
65 #include <sys/counter.h>
66
67 #ifdef _KERNEL
68 #define VMMETER_ALIGNED __aligned(CACHE_LINE_SIZE)
69 #else
70 #define VMMETER_ALIGNED
71 #endif
72
73 /*
74 * System wide statistics counters.
75 * Locking:
76 * c - constant after initialization
77 * p - uses counter(9)
78 */
79 struct vmmeter {
80 /*
81 * General system activity.
82 */
83 counter_u64_t v_swtch; /* (p) context switches */
84 counter_u64_t v_trap; /* (p) calls to trap */
85 counter_u64_t v_syscall; /* (p) calls to syscall() */
86 counter_u64_t v_intr; /* (p) device interrupts */
87 counter_u64_t v_soft; /* (p) software interrupts */
88 /*
89 * Virtual memory activity.
90 */
91 counter_u64_t v_vm_faults; /* (p) address memory faults */
92 counter_u64_t v_io_faults; /* (p) page faults requiring I/O */
93 counter_u64_t v_cow_faults; /* (p) copy-on-writes faults */
94 counter_u64_t v_cow_optim; /* (p) optimized COW faults */
95 counter_u64_t v_zfod; /* (p) pages zero filled on demand */
96 counter_u64_t v_ozfod; /* (p) optimized zero fill pages */
97 counter_u64_t v_swapin; /* (p) swap pager pageins */
98 counter_u64_t v_swapout; /* (p) swap pager pageouts */
99 counter_u64_t v_swappgsin; /* (p) swap pager pages paged in */
100 counter_u64_t v_swappgsout; /* (p) swap pager pages paged out */
101 counter_u64_t v_vnodein; /* (p) vnode pager pageins */
102 counter_u64_t v_vnodeout; /* (p) vnode pager pageouts */
103 counter_u64_t v_vnodepgsin; /* (p) vnode_pager pages paged in */
104 counter_u64_t v_vnodepgsout; /* (p) vnode pager pages paged out */
105 counter_u64_t v_intrans; /* (p) intransit blocking page faults */
106 counter_u64_t v_reactivated; /* (p) reactivated by the pagedaemon */
107 counter_u64_t v_pdwakeups; /* (p) times daemon has awaken */
108 counter_u64_t v_pdpages; /* (p) pages analyzed by daemon */
109 counter_u64_t v_pdshortfalls; /* (p) page reclamation shortfalls */
110
111 counter_u64_t v_dfree; /* (p) pages freed by daemon */
112 counter_u64_t v_pfree; /* (p) pages freed by processes */
113 counter_u64_t v_tfree; /* (p) total pages freed */
114 /*
115 * Fork/vfork/rfork activity.
116 */
117 counter_u64_t v_forks; /* (p) fork() calls */
118 counter_u64_t v_vforks; /* (p) vfork() calls */
119 counter_u64_t v_rforks; /* (p) rfork() calls */
120 counter_u64_t v_kthreads; /* (p) fork() calls by kernel */
121 counter_u64_t v_forkpages; /* (p) pages affected by fork() */
122 counter_u64_t v_vforkpages; /* (p) pages affected by vfork() */
123 counter_u64_t v_rforkpages; /* (p) pages affected by rfork() */
124 counter_u64_t v_kthreadpages; /* (p) ... and by kernel fork() */
125 counter_u64_t v_wire_count; /* (p) pages wired down */
126 #define VM_METER_NCOUNTERS \
127 (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
128 /*
129 * Distribution of page usages.
130 */
131 u_int v_page_size; /* (c) page size in bytes */
132 u_int v_page_count; /* (c) total number of pages in system */
133 u_int v_free_reserved; /* (c) pages reserved for deadlock */
134 u_int v_free_target; /* (c) pages desired free */
135 u_int v_free_min; /* (c) pages desired free */
136 u_int v_inactive_target; /* (c) pages desired inactive */
137 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
138 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
139 u_int v_free_severe; /* (c) severe page depletion point */
140 };
141 #endif /* _KERNEL || _WANT_VMMETER */
142
143 #ifdef _KERNEL
144
145 #include <sys/domainset.h>
146
147 extern struct vmmeter vm_cnt;
148 extern domainset_t all_domains;
149 extern domainset_t vm_min_domains;
150 extern domainset_t vm_severe_domains;
151
152 #define VM_CNT_ADD(var, x) counter_u64_add(vm_cnt.var, x)
153 #define VM_CNT_INC(var) VM_CNT_ADD(var, 1)
154 #define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var)
155
156 extern u_long vm_user_wire_count;
157
158 static inline void
159 vm_wire_add(int cnt)
160 {
161
162 VM_CNT_ADD(v_wire_count, cnt);
163 }
164
165 static inline void
166 vm_wire_sub(int cnt)
167 {
168
169 VM_CNT_ADD(v_wire_count, -cnt);
170 }
171
172 u_int vm_free_count(void);
173 static inline u_int
174 vm_wire_count(void)
175 {
176
177 return (VM_CNT_FETCH(v_wire_count));
178 }
179
180 /*
181 * Return TRUE if we are under our severe low-free-pages threshold
182 *
183 * These routines are typically used at the user<->system interface to determine
184 * whether we need to block in order to avoid a low memory deadlock.
185 */
186 static inline int
187 vm_page_count_severe(void)
188 {
189
190 return (!DOMAINSET_EMPTY(&vm_severe_domains));
191 }
192
193 static inline int
194 vm_page_count_severe_domain(int domain)
195 {
196
197 return (DOMAINSET_ISSET(domain, &vm_severe_domains));
198 }
199
200 static inline int
201 vm_page_count_severe_set(const domainset_t *mask)
202 {
203
204 return (DOMAINSET_SUBSET(&vm_severe_domains, mask));
205 }
206
207 /*
208 * Return TRUE if we are under our minimum low-free-pages threshold.
209 *
210 * These routines are typically used within the system to determine whether
211 * we can execute potentially very expensive code in terms of memory. It
212 * is also used by the pageout daemon to calculate when to sleep, when
213 * to wake waiters up, and when (after making a pass) to become more
214 * desperate.
215 */
216 static inline int
217 vm_page_count_min(void)
218 {
219
220 return (!DOMAINSET_EMPTY(&vm_min_domains));
221 }
222
223 static inline int
224 vm_page_count_min_domain(int domain)
225 {
226
227 return (DOMAINSET_ISSET(domain, &vm_min_domains));
228 }
229
230 static inline int
231 vm_page_count_min_set(const domainset_t *mask)
232 {
233
234 return (DOMAINSET_SUBSET(&vm_min_domains, mask));
235 }
236
237 #endif /* _KERNEL */
238 #endif /* _SYS_VMMETER_H_ */
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