1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*0Sstevel@tonic-gate /* All Rights Reserved */
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate /*
31*0Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988
32*0Sstevel@tonic-gate * The Regents of the University of California
33*0Sstevel@tonic-gate * All Rights Reserved
34*0Sstevel@tonic-gate *
35*0Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from
36*0Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its
37*0Sstevel@tonic-gate * contributors.
38*0Sstevel@tonic-gate */
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
41*0Sstevel@tonic-gate
42*0Sstevel@tonic-gate #include <sys/types.h>
43*0Sstevel@tonic-gate #include <sys/param.h>
44*0Sstevel@tonic-gate #include <sys/sysmacros.h>
45*0Sstevel@tonic-gate #include <sys/systm.h>
46*0Sstevel@tonic-gate #include <sys/vmsystm.h>
47*0Sstevel@tonic-gate #include <sys/cpuvar.h>
48*0Sstevel@tonic-gate #include <sys/sysinfo.h>
49*0Sstevel@tonic-gate
50*0Sstevel@tonic-gate /*
51*0Sstevel@tonic-gate * This define represents the number of
52*0Sstevel@tonic-gate * useful pages transferred per paging i/o operation, under the assumption
53*0Sstevel@tonic-gate * that half of the total number is actually useful. However, if there's
54*0Sstevel@tonic-gate * only one page transferred per operation, we assume that it's useful.
55*0Sstevel@tonic-gate */
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate #ifdef lint
58*0Sstevel@tonic-gate #define UsefulPagesPerIO 1
59*0Sstevel@tonic-gate #else /* lint */
60*0Sstevel@tonic-gate #define UsefulPagesPerIO nz((MAXBSIZE/PAGESIZE)/2)
61*0Sstevel@tonic-gate #endif /* lint */
62*0Sstevel@tonic-gate
63*0Sstevel@tonic-gate extern int dopageout;
64*0Sstevel@tonic-gate
65*0Sstevel@tonic-gate /* Average new into old with aging factor time */
66*0Sstevel@tonic-gate #define ave(smooth, cnt, time) \
67*0Sstevel@tonic-gate smooth = ((time - 1) * (smooth) + (cnt)) / (time)
68*0Sstevel@tonic-gate
69*0Sstevel@tonic-gate /*
70*0Sstevel@tonic-gate * pagein and pageout rates for use by swapper.
71*0Sstevel@tonic-gate */
72*0Sstevel@tonic-gate ulong_t pginrate; /* 5 second average */
73*0Sstevel@tonic-gate ulong_t pgoutrate; /* 5 second average */
74*0Sstevel@tonic-gate
75*0Sstevel@tonic-gate static ulong_t ogpagein; /* pagein rate a sec ago */
76*0Sstevel@tonic-gate static ulong_t ogpageout; /* pageout rate a sec ago */
77*0Sstevel@tonic-gate
78*0Sstevel@tonic-gate /*
79*0Sstevel@tonic-gate * Called once a second to gather statistics.
80*0Sstevel@tonic-gate */
81*0Sstevel@tonic-gate void
vmmeter(void)82*0Sstevel@tonic-gate vmmeter(void)
83*0Sstevel@tonic-gate {
84*0Sstevel@tonic-gate cpu_t *cp;
85*0Sstevel@tonic-gate ulong_t gpagein, gpageout;
86*0Sstevel@tonic-gate
87*0Sstevel@tonic-gate /*
88*0Sstevel@tonic-gate * Compute 5 sec and 30 sec average free memory values.
89*0Sstevel@tonic-gate */
90*0Sstevel@tonic-gate ave(avefree, freemem, 5);
91*0Sstevel@tonic-gate ave(avefree30, freemem, 30);
92*0Sstevel@tonic-gate
93*0Sstevel@tonic-gate /*
94*0Sstevel@tonic-gate * Compute the 5 secs average of pageins and pageouts.
95*0Sstevel@tonic-gate */
96*0Sstevel@tonic-gate gpagein = gpageout = 0;
97*0Sstevel@tonic-gate
98*0Sstevel@tonic-gate cp = cpu_list;
99*0Sstevel@tonic-gate do {
100*0Sstevel@tonic-gate gpagein += (ulong_t)CPU_STATS(cp, vm.pgin);
101*0Sstevel@tonic-gate gpageout += (ulong_t)CPU_STATS(cp, vm.pgout);
102*0Sstevel@tonic-gate } while ((cp = cp->cpu_next) != cpu_list);
103*0Sstevel@tonic-gate
104*0Sstevel@tonic-gate if ((gpagein >= ogpagein) && (gpageout >= ogpageout)) {
105*0Sstevel@tonic-gate ave(pginrate, gpagein - ogpagein, 5);
106*0Sstevel@tonic-gate ave(pgoutrate, gpageout - ogpageout, 5);
107*0Sstevel@tonic-gate }
108*0Sstevel@tonic-gate
109*0Sstevel@tonic-gate /*
110*0Sstevel@tonic-gate * Save the current pagein/pageout values.
111*0Sstevel@tonic-gate */
112*0Sstevel@tonic-gate ogpagein = gpagein;
113*0Sstevel@tonic-gate ogpageout = gpageout;
114*0Sstevel@tonic-gate
115*0Sstevel@tonic-gate if (!lotsfree || !dopageout)
116*0Sstevel@tonic-gate return;
117*0Sstevel@tonic-gate
118*0Sstevel@tonic-gate /*
119*0Sstevel@tonic-gate * Decay deficit by the expected number of pages brought in since
120*0Sstevel@tonic-gate * the last call (i.e., in the last second). The calculation
121*0Sstevel@tonic-gate * assumes that one half of the pages brought in are actually
122*0Sstevel@tonic-gate * useful (see comment above), and that half of the overall
123*0Sstevel@tonic-gate * paging i/o activity is pageins as opposed to pageouts (the
124*0Sstevel@tonic-gate * trailing factor of 2) It also assumes that paging i/o is done
125*0Sstevel@tonic-gate * in units of MAXBSIZE bytes, which is a dubious assumption to
126*0Sstevel@tonic-gate * apply to all file system types.
127*0Sstevel@tonic-gate */
128*0Sstevel@tonic-gate deficit -= MIN(deficit,
129*0Sstevel@tonic-gate MAX(deficit / 10, UsefulPagesPerIO * maxpgio / 2));
130*0Sstevel@tonic-gate }
131