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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
| 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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
|
| 23 * Copyright (c) 2012 by Delphix. All rights reserved.
|
23 */
24
25#include <sys/zfs_context.h>
26
27list_t zfs_dbgmsgs;
28int zfs_dbgmsg_size;
29kmutex_t zfs_dbgmsgs_lock;
30int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
31
32void
33zfs_dbgmsg_init(void)
34{
35 list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
36 offsetof(zfs_dbgmsg_t, zdm_node));
37 mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
38}
39
40void
41zfs_dbgmsg_fini(void)
42{
43 zfs_dbgmsg_t *zdm;
44
45 while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
46 int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
47 kmem_free(zdm, size);
48 zfs_dbgmsg_size -= size;
49 }
50 mutex_destroy(&zfs_dbgmsgs_lock);
| 24 */
25
26#include <sys/zfs_context.h>
27
28list_t zfs_dbgmsgs;
29int zfs_dbgmsg_size;
30kmutex_t zfs_dbgmsgs_lock;
31int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
32
33void
34zfs_dbgmsg_init(void)
35{
36 list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
37 offsetof(zfs_dbgmsg_t, zdm_node));
38 mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
39}
40
41void
42zfs_dbgmsg_fini(void)
43{
44 zfs_dbgmsg_t *zdm;
45
46 while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
47 int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
48 kmem_free(zdm, size);
49 zfs_dbgmsg_size -= size;
50 }
51 mutex_destroy(&zfs_dbgmsgs_lock);
|
51 ASSERT3U(zfs_dbgmsg_size, ==, 0);
| 52 ASSERT0(zfs_dbgmsg_size);
|
52}
53
54/*
55 * Print these messages by running:
| 53}
54
55/*
56 * Print these messages by running:
|
56 * echo ::zfs_dbgmsg | mdb -k
| 57 * echo ::zfs_dbgmsg | mdb -k
|
57 *
58 * Monitor these messages by running:
59 * dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
60 */
61void
62zfs_dbgmsg(const char *fmt, ...)
63{
64 int size;
65 va_list adx;
66 zfs_dbgmsg_t *zdm;
67
68 va_start(adx, fmt);
69 size = vsnprintf(NULL, 0, fmt, adx);
70 va_end(adx);
71
72 /*
73 * There is one byte of string in sizeof (zfs_dbgmsg_t), used
74 * for the terminating null.
75 */
76 zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
77 zdm->zdm_timestamp = gethrestime_sec();
78
79 va_start(adx, fmt);
80 (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
81 va_end(adx);
82
83 DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
84
85 mutex_enter(&zfs_dbgmsgs_lock);
86 list_insert_tail(&zfs_dbgmsgs, zdm);
87 zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
88 while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
89 zdm = list_remove_head(&zfs_dbgmsgs);
90 size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
91 kmem_free(zdm, size);
92 zfs_dbgmsg_size -= size;
93 }
94 mutex_exit(&zfs_dbgmsgs_lock);
95}
| 58 *
59 * Monitor these messages by running:
60 * dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
61 */
62void
63zfs_dbgmsg(const char *fmt, ...)
64{
65 int size;
66 va_list adx;
67 zfs_dbgmsg_t *zdm;
68
69 va_start(adx, fmt);
70 size = vsnprintf(NULL, 0, fmt, adx);
71 va_end(adx);
72
73 /*
74 * There is one byte of string in sizeof (zfs_dbgmsg_t), used
75 * for the terminating null.
76 */
77 zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
78 zdm->zdm_timestamp = gethrestime_sec();
79
80 va_start(adx, fmt);
81 (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
82 va_end(adx);
83
84 DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
85
86 mutex_enter(&zfs_dbgmsgs_lock);
87 list_insert_tail(&zfs_dbgmsgs, zdm);
88 zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
89 while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
90 zdm = list_remove_head(&zfs_dbgmsgs);
91 size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
92 kmem_free(zdm, size);
93 zfs_dbgmsg_size -= size;
94 }
95 mutex_exit(&zfs_dbgmsgs_lock);
96}
|