1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * University Copyright- Copyright (c) 1982, 1986, 1988
31 * The Regents of the University of California
32 * All Rights Reserved
33 *
34 * University Acknowledgment- Portions of this document are derived from
35 * software developed by the University of California, Berkeley, and its
36 * contributors.
37 */
38
39 #include <sys/types.h>
40 #include <sys/t_lock.h>
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/mman.h>
44 #include <sys/sysmacros.h>
45 #include <sys/errno.h>
46 #include <sys/signal.h>
47 #include <sys/user.h>
48 #include <sys/proc.h>
49 #include <sys/cmn_err.h>
50 #include <sys/debug.h>
51
52 #include <vm/hat.h>
53 #include <vm/as.h>
54 #include <vm/seg_vn.h>
55 #include <vm/rm.h>
56 #include <vm/seg.h>
57 #include <vm/page.h>
58
59 /*
60 * Yield the memory claim requirement for an address space.
61 *
62 * This is currently implemented as the number of active hardware
63 * translations that have page structures. Therefore, it can
64 * underestimate the traditional resident set size, eg, if the
65 * physical page is present and the hardware translation is missing;
66 * and it can overestimate the rss, eg, if there are active
67 * translations to a frame buffer with page structs.
68 * Also, it does not take sharing and XHATs into account.
69 */
70 size_t
rm_asrss(as)71 rm_asrss(as)
72 register struct as *as;
73 {
74 if (as != (struct as *)NULL && as != &kas)
75 return ((size_t)btop(hat_get_mapped_size(as->a_hat)));
76 else
77 return (0);
78 }
79
80 /*
81 * Return a 16-bit binary fraction representing the percent of total memory
82 * used by this address space. Binary point is to right of high-order bit.
83 * Defined as the ratio of a_rss for the process to total physical memory.
84 * This assumes 2s-complement arithmetic and that shorts and longs are
85 * 16 bits and 32 bits, respectively.
86 */
87 ushort_t
rm_pctmemory(struct as * as)88 rm_pctmemory(struct as *as)
89 {
90 /* This can't overflow */
91 ulong_t num = (ulong_t)rm_asrss(as) << (PAGESHIFT-1);
92 int shift = 16 - PAGESHIFT;
93 ulong_t total = total_pages;
94
95 if (shift < 0) {
96 num >>= (-shift);
97 shift = 0;
98 }
99 while (shift > 0 && (num & 0x80000000) == 0) {
100 shift--;
101 num <<= 1;
102 }
103 if (shift > 0)
104 total >>= shift;
105
106 return (num / total);
107 }
108