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 * $FreeBSD$
31 */
32
33 #ifndef _SYS_VMMETER_H_
34 #define _SYS_VMMETER_H_
35
36 /*
37 * System wide statistics counters.
38 */
39 struct vmmeter {
40 /*
41 * General system activity.
42 */
43 u_int v_swtch; /* context switches */
44 u_int v_trap; /* calls to trap */
45 u_int v_syscall; /* calls to syscall() */
46 u_int v_intr; /* device interrupts */
47 u_int v_soft; /* software interrupts */
48 /*
49 * Virtual memory activity.
50 */
51 u_int v_vm_faults; /* number of address memory faults */
52 u_int v_cow_faults; /* number of copy-on-writes */
53 u_int v_cow_optim; /* number of optimized copy-on-writes */
54 u_int v_zfod; /* pages zero filled on demand */
55 u_int v_ozfod; /* optimized zero fill pages */
56 u_int v_swapin; /* swap pager pageins */
57 u_int v_swapout; /* swap pager pageouts */
58 u_int v_swappgsin; /* swap pager pages paged in */
59 u_int v_swappgsout; /* swap pager pages paged out */
60 u_int v_vnodein; /* vnode pager pageins */
61 u_int v_vnodeout; /* vnode pager pageouts */
62 u_int v_vnodepgsin; /* vnode_pager pages paged in */
63 u_int v_vnodepgsout; /* vnode pager pages paged out */
64 u_int v_intrans; /* intransit blocking page faults */
65 u_int v_reactivated; /* number of pages reactivated from free list */
66 u_int v_pdwakeups; /* number of times daemon has awaken from sleep */
67 u_int v_pdpages; /* number of pages analyzed by daemon */
68
69 u_int v_dfree; /* pages freed by daemon */
70 u_int v_pfree; /* pages freed by exiting processes */
71 u_int v_tfree; /* total pages freed */
72 /*
73 * Distribution of page usages.
74 */
75 u_int v_page_size; /* page size in bytes */
76 u_int v_page_count; /* total number of pages in system */
77 u_int v_free_reserved; /* number of pages reserved for deadlock */
78 u_int v_free_target; /* number of pages desired free */
79 u_int v_free_min; /* minimum number of pages desired free */
80 u_int v_free_count; /* number of pages free */
81 u_int v_wire_count; /* number of pages wired down */
82 u_int v_active_count; /* number of pages active */
83 u_int v_inactive_target; /* number of pages desired inactive */
84 u_int v_inactive_count; /* number of pages inactive */
85 u_int v_cache_count; /* number of pages on buffer cache queue */
86 u_int v_cache_min; /* min number of pages desired on cache queue */
87 u_int v_cache_max; /* max number of pages in cached obj */
88 u_int v_pageout_free_min; /* min number pages reserved for kernel */
89 u_int v_interrupt_free_min; /* reserved number of pages for int code */
90 u_int v_free_severe; /* severe depletion of pages below this pt */
91 /*
92 * Fork/vfork/rfork activity.
93 */
94 u_int v_forks; /* number of fork() calls */
95 u_int v_vforks; /* number of vfork() calls */
96 u_int v_rforks; /* number of rfork() calls */
97 u_int v_kthreads; /* number of fork() calls by kernel */
98 u_int v_forkpages; /* number of VM pages affected by fork() */
99 u_int v_vforkpages; /* number of VM pages affected by vfork() */
100 u_int v_rforkpages; /* number of VM pages affected by rfork() */
101 u_int v_kthreadpages; /* number of VM pages affected by fork() by kernel */
102 };
103 #ifdef _KERNEL
104
105 extern struct vmmeter cnt;
106
107 /*
108 * Return TRUE if we are under our reserved low-free-pages threshold
109 */
110
111 static __inline
112 int
113 vm_page_count_reserved(void)
114 {
115 return (cnt.v_free_reserved > (cnt.v_free_count + cnt.v_cache_count));
116 }
117
118 /*
119 * Return TRUE if we are under our severe low-free-pages threshold
120 *
121 * This routine is typically used at the user<->system interface to determine
122 * whether we need to block in order to avoid a low memory deadlock.
123 */
124
125 static __inline
126 int
127 vm_page_count_severe(void)
128 {
129 return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
130 }
131
132 /*
133 * Return TRUE if we are under our minimum low-free-pages threshold.
134 *
135 * This routine is typically used within the system to determine whether
136 * we can execute potentially very expensive code in terms of memory. It
137 * is also used by the pageout daemon to calculate when to sleep, when
138 * to wake waiters up, and when (after making a pass) to become more
139 * desparate.
140 */
141
142 static __inline
143 int
144 vm_page_count_min(void)
145 {
146 return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
147 }
148
149 /*
150 * Return TRUE if we have not reached our free page target during
151 * free page recovery operations.
152 */
153
154 static __inline
155 int
156 vm_page_count_target(void)
157 {
158 return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
159 }
160
161 /*
162 * Return the number of pages we need to free-up or cache
163 * A positive number indicates that we do not have enough free pages.
164 */
165
166 static __inline
167 int
168 vm_paging_target(void)
169 {
170 return (
171 (cnt.v_free_target + cnt.v_cache_min) -
172 (cnt.v_free_count + cnt.v_cache_count)
173 );
174 }
175
176 /*
177 * Returns TRUE if the pagedaemon needs to be woken up.
178 */
179
180 static __inline
181 int
182 vm_paging_needed(void)
183 {
184 return (
185 (cnt.v_free_reserved + cnt.v_cache_min) >
186 (cnt.v_free_count + cnt.v_cache_count)
187 );
188 }
189
190 #endif
191
192 /* systemwide totals computed every five seconds */
193 struct vmtotal {
194 int16_t t_rq; /* length of the run queue */
195 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
196 int16_t t_pw; /* jobs in page wait */
197 int16_t t_sl; /* jobs sleeping in core */
198 int16_t t_sw; /* swapped out runnable/short block jobs */
199 int32_t t_vm; /* total virtual memory */
200 int32_t t_avm; /* active virtual memory */
201 int32_t t_rm; /* total real memory in use */
202 int32_t t_arm; /* active real memory */
203 int32_t t_vmshr; /* shared virtual memory */
204 int32_t t_avmshr; /* active shared virtual memory */
205 int32_t t_rmshr; /* shared real memory */
206 int32_t t_armshr; /* active shared real memory */
207 int32_t t_free; /* free memory pages */
208 };
209
210 #endif
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