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428870ff BB |
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. | |
ea04106b | 23 | * Copyright (c) 2012, 2014 by Delphix. All rights reserved. |
428870ff BB |
24 | */ |
25 | ||
26 | #include <sys/zfs_context.h> | |
27 | ||
a08ee875 LG |
28 | list_t zfs_dbgmsgs; |
29 | int zfs_dbgmsg_size; | |
30 | kmutex_t zfs_dbgmsgs_lock; | |
ea04106b | 31 | int zfs_dbgmsg_maxsize = 4<<20; /* 4MB */ |
428870ff | 32 | |
428870ff | 33 | void |
d7e398ce | 34 | zfs_dbgmsg_init(void) |
428870ff | 35 | { |
a08ee875 LG |
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); | |
d7e398ce | 39 | } |
428870ff | 40 | |
d7e398ce BB |
41 | void |
42 | zfs_dbgmsg_fini(void) | |
43 | { | |
a08ee875 LG |
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); | |
52 | ASSERT0(zfs_dbgmsg_size); | |
a08ee875 LG |
53 | } |
54 | ||
a08ee875 | 55 | /* |
ea04106b | 56 | * To get this data enable the zfs__dbgmsg tracepoint as shown: |
a08ee875 | 57 | * |
ea04106b AX |
58 | * # Enable zfs__dbgmsg tracepoint, clear the tracepoint ring buffer |
59 | * $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable | |
60 | * $ echo 0 > /sys/kernel/debug/tracing/trace | |
61 | * | |
62 | * # Dump the ring buffer. | |
63 | * $ cat /sys/kernel/debug/tracing/trace | |
a08ee875 LG |
64 | */ |
65 | void | |
66 | zfs_dbgmsg(const char *fmt, ...) | |
67 | { | |
68 | int size; | |
69 | va_list adx; | |
ea04106b | 70 | char *nl; |
a08ee875 LG |
71 | zfs_dbgmsg_t *zdm; |
72 | ||
73 | va_start(adx, fmt); | |
74 | size = vsnprintf(NULL, 0, fmt, adx); | |
75 | va_end(adx); | |
76 | ||
77 | /* | |
78 | * There is one byte of string in sizeof (zfs_dbgmsg_t), used | |
79 | * for the terminating null. | |
80 | */ | |
81 | zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP); | |
82 | zdm->zdm_timestamp = gethrestime_sec(); | |
83 | ||
84 | va_start(adx, fmt); | |
85 | (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx); | |
86 | va_end(adx); | |
87 | ||
ea04106b AX |
88 | /* |
89 | * Get rid of trailing newline. | |
90 | */ | |
91 | nl = strrchr(zdm->zdm_msg, '\n'); | |
92 | if (nl != NULL) | |
93 | *nl = '\0'; | |
94 | ||
a08ee875 LG |
95 | DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg); |
96 | ||
97 | mutex_enter(&zfs_dbgmsgs_lock); | |
98 | list_insert_tail(&zfs_dbgmsgs, zdm); | |
99 | zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size; | |
100 | while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) { | |
101 | zdm = list_remove_head(&zfs_dbgmsgs); | |
102 | size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg); | |
103 | kmem_free(zdm, size); | |
104 | zfs_dbgmsg_size -= size; | |
105 | } | |
106 | mutex_exit(&zfs_dbgmsgs_lock); | |
d7e398ce | 107 | } |
428870ff | 108 | |
a08ee875 LG |
109 | void |
110 | zfs_dbgmsg_print(const char *tag) | |
111 | { | |
ea04106b | 112 | #if !defined(_KERNEL) |
a08ee875 LG |
113 | zfs_dbgmsg_t *zdm; |
114 | ||
115 | (void) printf("ZFS_DBGMSG(%s):\n", tag); | |
116 | mutex_enter(&zfs_dbgmsgs_lock); | |
117 | for (zdm = list_head(&zfs_dbgmsgs); zdm; | |
118 | zdm = list_next(&zfs_dbgmsgs, zdm)) | |
119 | (void) printf("%s\n", zdm->zdm_msg); | |
120 | mutex_exit(&zfs_dbgmsgs_lock); | |
ea04106b | 121 | #endif /* !_KERNEL */ |
a08ee875 | 122 | } |