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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: releng/5.1/sys/sys/vmmeter.h 110225 2003-02-02 07:16:40Z alc $
35 */
36
37 #ifndef _SYS_VMMETER_H_
38 #define _SYS_VMMETER_H_
39
40 /*
41 * System wide statistics counters.
42 */
43 struct vmmeter {
44 /*
45 * General system activity.
46 */
47 u_int v_swtch; /* context switches */
48 u_int v_trap; /* calls to trap */
49 u_int v_syscall; /* calls to syscall() */
50 u_int v_intr; /* device interrupts */
51 u_int v_soft; /* software interrupts */
52 /*
53 * Virtual memory activity.
54 */
55 u_int v_vm_faults; /* number of address memory faults */
56 u_int v_cow_faults; /* number of copy-on-writes */
57 u_int v_cow_optim; /* number of optimized copy-on-writes */
58 u_int v_zfod; /* pages zero filled on demand */
59 u_int v_ozfod; /* optimized zero fill pages */
60 u_int v_swapin; /* swap pager pageins */
61 u_int v_swapout; /* swap pager pageouts */
62 u_int v_swappgsin; /* swap pager pages paged in */
63 u_int v_swappgsout; /* swap pager pages paged out */
64 u_int v_vnodein; /* vnode pager pageins */
65 u_int v_vnodeout; /* vnode pager pageouts */
66 u_int v_vnodepgsin; /* vnode_pager pages paged in */
67 u_int v_vnodepgsout; /* vnode pager pages paged out */
68 u_int v_intrans; /* intransit blocking page faults */
69 u_int v_reactivated; /* number of pages reactivated from free list */
70 u_int v_pdwakeups; /* number of times daemon has awaken from sleep */
71 u_int v_pdpages; /* number of pages analyzed by daemon */
72
73 u_int v_dfree; /* pages freed by daemon */
74 u_int v_pfree; /* pages freed by exiting processes */
75 u_int v_tfree; /* total pages freed */
76 /*
77 * Distribution of page usages.
78 */
79 u_int v_page_size; /* page size in bytes */
80 u_int v_page_count; /* total number of pages in system */
81 u_int v_free_reserved; /* number of pages reserved for deadlock */
82 u_int v_free_target; /* number of pages desired free */
83 u_int v_free_min; /* minimum number of pages desired free */
84 u_int v_free_count; /* number of pages free */
85 u_int v_wire_count; /* number of pages wired down */
86 u_int v_active_count; /* number of pages active */
87 u_int v_inactive_target; /* number of pages desired inactive */
88 u_int v_inactive_count; /* number of pages inactive */
89 u_int v_cache_count; /* number of pages on buffer cache queue */
90 u_int v_cache_min; /* min number of pages desired on cache queue */
91 u_int v_cache_max; /* max number of pages in cached obj */
92 u_int v_pageout_free_min; /* min number pages reserved for kernel */
93 u_int v_interrupt_free_min; /* reserved number of pages for int code */
94 u_int v_free_severe; /* severe depletion of pages below this pt */
95 /*
96 * Fork/vfork/rfork activity.
97 */
98 u_int v_forks; /* number of fork() calls */
99 u_int v_vforks; /* number of vfork() calls */
100 u_int v_rforks; /* number of rfork() calls */
101 u_int v_kthreads; /* number of fork() calls by kernel */
102 u_int v_forkpages; /* number of VM pages affected by fork() */
103 u_int v_vforkpages; /* number of VM pages affected by vfork() */
104 u_int v_rforkpages; /* number of VM pages affected by rfork() */
105 u_int v_kthreadpages; /* number of VM pages affected by fork() by kernel */
106 };
107 #ifdef _KERNEL
108
109 extern struct vmmeter cnt;
110
111 /*
112 * Return TRUE if we are under our reserved low-free-pages threshold
113 */
114
115 static __inline
116 int
117 vm_page_count_reserved(void)
118 {
119 return (cnt.v_free_reserved > (cnt.v_free_count + cnt.v_cache_count));
120 }
121
122 /*
123 * Return TRUE if we are under our severe low-free-pages threshold
124 *
125 * This routine is typically used at the user<->system interface to determine
126 * whether we need to block in order to avoid a low memory deadlock.
127 */
128
129 static __inline
130 int
131 vm_page_count_severe(void)
132 {
133 return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_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 * desparate.
144 */
145
146 static __inline
147 int
148 vm_page_count_min(void)
149 {
150 return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
151 }
152
153 /*
154 * Return TRUE if we have not reached our free page target during
155 * free page recovery operations.
156 */
157
158 static __inline
159 int
160 vm_page_count_target(void)
161 {
162 return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
163 }
164
165 /*
166 * Return the number of pages we need to free-up or cache
167 * A positive number indicates that we do not have enough free pages.
168 */
169
170 static __inline
171 int
172 vm_paging_target(void)
173 {
174 return (
175 (cnt.v_free_target + cnt.v_cache_min) -
176 (cnt.v_free_count + cnt.v_cache_count)
177 );
178 }
179
180 /*
181 * Returns TRUE if the pagedaemon needs to be woken up.
182 */
183
184 static __inline
185 int
186 vm_paging_needed(void)
187 {
188 return (
189 (cnt.v_free_reserved + cnt.v_cache_min) >
190 (cnt.v_free_count + cnt.v_cache_count)
191 );
192 }
193
194 #endif
195
196 /* systemwide totals computed every five seconds */
197 struct vmtotal {
198 int16_t t_rq; /* length of the run queue */
199 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
200 int16_t t_pw; /* jobs in page wait */
201 int16_t t_sl; /* jobs sleeping in core */
202 int16_t t_sw; /* swapped out runnable/short block jobs */
203 int32_t t_vm; /* total virtual memory */
204 int32_t t_avm; /* active virtual memory */
205 int32_t t_rm; /* total real memory in use */
206 int32_t t_arm; /* active real memory */
207 int32_t t_vmshr; /* shared virtual memory */
208 int32_t t_avmshr; /* active shared virtual memory */
209 int32_t t_rmshr; /* shared real memory */
210 int32_t t_armshr; /* active shared real memory */
211 int32_t t_free; /* free memory pages */
212 };
213
214 /*
215 * Optional instrumentation.
216 */
217 #ifdef PGINPROF
218
219 #define NDMON 128
220 #define NSMON 128
221
222 #define DRES 20
223 #define SRES 5
224
225 #define PMONMIN 20
226 #define PRES 50
227 #define NPMON 64
228
229 #define RMONMIN 130
230 #define RRES 5
231 #define NRMON 64
232
233 /* data and stack size distribution counters */
234 u_int dmon[NDMON+1];
235 u_int smon[NSMON+1];
236
237 /* page in time distribution counters */
238 u_int pmon[NPMON+2];
239
240 /* reclaim time distribution counters */
241 u_int rmon[NRMON+2];
242
243 int pmonmin;
244 int pres;
245 int rmonmin;
246 int rres;
247
248 u_int rectime; /* accumulator for reclaim times */
249 u_int pgintime; /* accumulator for page in times */
250 #endif
251
252 #endif
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