1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate *
4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate * with the License.
8*7c478bd9Sstevel@tonic-gate *
9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate *
14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate *
20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate */
26*7c478bd9Sstevel@tonic-gate
27*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */
29*7c478bd9Sstevel@tonic-gate
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988
32*7c478bd9Sstevel@tonic-gate * The Regents of the University of California
33*7c478bd9Sstevel@tonic-gate * All Rights Reserved
34*7c478bd9Sstevel@tonic-gate *
35*7c478bd9Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from
36*7c478bd9Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its
37*7c478bd9Sstevel@tonic-gate * contributors.
38*7c478bd9Sstevel@tonic-gate */
39*7c478bd9Sstevel@tonic-gate
40*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
41*7c478bd9Sstevel@tonic-gate #include <sys/param.h>
42*7c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h>
43*7c478bd9Sstevel@tonic-gate #include <sys/systm.h>
44*7c478bd9Sstevel@tonic-gate #include <sys/vmsystm.h>
45*7c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h>
46*7c478bd9Sstevel@tonic-gate #include <sys/sysinfo.h>
47*7c478bd9Sstevel@tonic-gate
48*7c478bd9Sstevel@tonic-gate /*
49*7c478bd9Sstevel@tonic-gate * This define represents the number of
50*7c478bd9Sstevel@tonic-gate * useful pages transferred per paging i/o operation, under the assumption
51*7c478bd9Sstevel@tonic-gate * that half of the total number is actually useful. However, if there's
52*7c478bd9Sstevel@tonic-gate * only one page transferred per operation, we assume that it's useful.
53*7c478bd9Sstevel@tonic-gate */
54*7c478bd9Sstevel@tonic-gate
55*7c478bd9Sstevel@tonic-gate #ifdef lint
56*7c478bd9Sstevel@tonic-gate #define UsefulPagesPerIO 1
57*7c478bd9Sstevel@tonic-gate #else /* lint */
58*7c478bd9Sstevel@tonic-gate #define UsefulPagesPerIO nz((MAXBSIZE/PAGESIZE)/2)
59*7c478bd9Sstevel@tonic-gate #endif /* lint */
60*7c478bd9Sstevel@tonic-gate
61*7c478bd9Sstevel@tonic-gate extern int dopageout;
62*7c478bd9Sstevel@tonic-gate
63*7c478bd9Sstevel@tonic-gate /* Average new into old with aging factor time */
64*7c478bd9Sstevel@tonic-gate #define ave(smooth, cnt, time) \
65*7c478bd9Sstevel@tonic-gate smooth = ((time - 1) * (smooth) + (cnt)) / (time)
66*7c478bd9Sstevel@tonic-gate
67*7c478bd9Sstevel@tonic-gate /*
68*7c478bd9Sstevel@tonic-gate * pagein and pageout rates for use by swapper.
69*7c478bd9Sstevel@tonic-gate */
70*7c478bd9Sstevel@tonic-gate ulong_t pginrate; /* 5 second average */
71*7c478bd9Sstevel@tonic-gate ulong_t pgoutrate; /* 5 second average */
72*7c478bd9Sstevel@tonic-gate
73*7c478bd9Sstevel@tonic-gate static ulong_t ogpagein; /* pagein rate a sec ago */
74*7c478bd9Sstevel@tonic-gate static ulong_t ogpageout; /* pageout rate a sec ago */
75*7c478bd9Sstevel@tonic-gate
76*7c478bd9Sstevel@tonic-gate /*
77*7c478bd9Sstevel@tonic-gate * Called once a second to gather statistics.
78*7c478bd9Sstevel@tonic-gate */
79*7c478bd9Sstevel@tonic-gate void
vmmeter(void)80*7c478bd9Sstevel@tonic-gate vmmeter(void)
81*7c478bd9Sstevel@tonic-gate {
82*7c478bd9Sstevel@tonic-gate cpu_t *cp;
83*7c478bd9Sstevel@tonic-gate ulong_t gpagein, gpageout;
84*7c478bd9Sstevel@tonic-gate
85*7c478bd9Sstevel@tonic-gate /*
86*7c478bd9Sstevel@tonic-gate * Compute 5 sec and 30 sec average free memory values.
87*7c478bd9Sstevel@tonic-gate */
88*7c478bd9Sstevel@tonic-gate ave(avefree, freemem, 5);
89*7c478bd9Sstevel@tonic-gate ave(avefree30, freemem, 30);
90*7c478bd9Sstevel@tonic-gate
91*7c478bd9Sstevel@tonic-gate /*
92*7c478bd9Sstevel@tonic-gate * Compute the 5 secs average of pageins and pageouts.
93*7c478bd9Sstevel@tonic-gate */
94*7c478bd9Sstevel@tonic-gate gpagein = gpageout = 0;
95*7c478bd9Sstevel@tonic-gate
96*7c478bd9Sstevel@tonic-gate cp = cpu_list;
97*7c478bd9Sstevel@tonic-gate do {
98*7c478bd9Sstevel@tonic-gate gpagein += (ulong_t)CPU_STATS(cp, vm.pgin);
99*7c478bd9Sstevel@tonic-gate gpageout += (ulong_t)CPU_STATS(cp, vm.pgout);
100*7c478bd9Sstevel@tonic-gate } while ((cp = cp->cpu_next) != cpu_list);
101*7c478bd9Sstevel@tonic-gate
102*7c478bd9Sstevel@tonic-gate if ((gpagein >= ogpagein) && (gpageout >= ogpageout)) {
103*7c478bd9Sstevel@tonic-gate ave(pginrate, gpagein - ogpagein, 5);
104*7c478bd9Sstevel@tonic-gate ave(pgoutrate, gpageout - ogpageout, 5);
105*7c478bd9Sstevel@tonic-gate }
106*7c478bd9Sstevel@tonic-gate
107*7c478bd9Sstevel@tonic-gate /*
108*7c478bd9Sstevel@tonic-gate * Save the current pagein/pageout values.
109*7c478bd9Sstevel@tonic-gate */
110*7c478bd9Sstevel@tonic-gate ogpagein = gpagein;
111*7c478bd9Sstevel@tonic-gate ogpageout = gpageout;
112*7c478bd9Sstevel@tonic-gate
113*7c478bd9Sstevel@tonic-gate if (!lotsfree || !dopageout)
114*7c478bd9Sstevel@tonic-gate return;
115*7c478bd9Sstevel@tonic-gate
116*7c478bd9Sstevel@tonic-gate /*
117*7c478bd9Sstevel@tonic-gate * Decay deficit by the expected number of pages brought in since
118*7c478bd9Sstevel@tonic-gate * the last call (i.e., in the last second). The calculation
119*7c478bd9Sstevel@tonic-gate * assumes that one half of the pages brought in are actually
120*7c478bd9Sstevel@tonic-gate * useful (see comment above), and that half of the overall
121*7c478bd9Sstevel@tonic-gate * paging i/o activity is pageins as opposed to pageouts (the
122*7c478bd9Sstevel@tonic-gate * trailing factor of 2) It also assumes that paging i/o is done
123*7c478bd9Sstevel@tonic-gate * in units of MAXBSIZE bytes, which is a dubious assumption to
124*7c478bd9Sstevel@tonic-gate * apply to all file system types.
125*7c478bd9Sstevel@tonic-gate */
126*7c478bd9Sstevel@tonic-gate deficit -= MIN(deficit,
127*7c478bd9Sstevel@tonic-gate MAX(deficit / 10, UsefulPagesPerIO * maxpgio / 2));
128*7c478bd9Sstevel@tonic-gate }
129