Fix: lttng-sessiond: cpu hotplug: send channel to consumer only once
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #ifndef _LTT_TRACE_KERNEL_H
19 #define _LTT_TRACE_KERNEL_H
20
21 #include <urcu/list.h>
22
23 #include <lttng/lttng.h>
24 #include <common/lttng-kernel.h>
25 #include <common/lttng-kernel-old.h>
26 #include <common/defaults.h>
27
28 #include "consumer.h"
29
30 /* Kernel event list */
31 struct ltt_kernel_event_list {
32 struct cds_list_head head;
33 };
34
35 /* Channel stream list */
36 struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38 };
39
40 /* Channel list */
41 struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43 };
44
45 struct ltt_kernel_context {
46 struct lttng_kernel_context ctx;
47 struct cds_list_head list;
48 };
49
50 /* Kernel event */
51 struct ltt_kernel_event {
52 int fd;
53 int enabled;
54 enum lttng_event_type type;
55 struct lttng_kernel_event *event;
56 struct cds_list_head list;
57 char *filter_expression;
58 struct lttng_filter_bytecode *filter;
59 };
60
61 /* Kernel channel */
62 struct ltt_kernel_channel {
63 int fd;
64 int enabled;
65 unsigned int stream_count;
66 unsigned int event_count;
67 struct cds_list_head ctx_list;
68 struct lttng_channel *channel;
69 struct ltt_kernel_event_list events_list;
70 struct ltt_kernel_stream_list stream_list;
71 struct cds_list_head list;
72 /* Session pointer which has a reference to this object. */
73 struct ltt_kernel_session *session;
74 bool sent_to_consumer;
75 };
76
77 /* Metadata */
78 struct ltt_kernel_metadata {
79 int fd;
80 struct lttng_channel *conf;
81 };
82
83 /* Channel stream */
84 struct ltt_kernel_stream {
85 int fd;
86 int state;
87 int cpu;
88 bool sent_to_consumer;
89 /* Format is %s_%d respectively channel name and CPU number. */
90 char name[DEFAULT_STREAM_NAME_LEN];
91 uint64_t tracefile_size;
92 uint64_t tracefile_count;
93 struct cds_list_head list;
94 };
95
96 /* Kernel session */
97 struct ltt_kernel_session {
98 int fd;
99 int metadata_stream_fd;
100 int consumer_fds_sent;
101 unsigned int channel_count;
102 unsigned int stream_count_global;
103 struct ltt_kernel_metadata *metadata;
104 struct ltt_kernel_channel_list channel_list;
105 /* UID/GID of the user owning the session */
106 uid_t uid;
107 gid_t gid;
108 struct consumer_output *consumer;
109 /* Tracing session id */
110 uint64_t id;
111 /* Session is active or not meaning it has been started or stopped. */
112 unsigned int active:1;
113 /* Tell or not if the session has to output the traces. */
114 unsigned int output_traces;
115 unsigned int snapshot_mode;
116 unsigned int has_non_default_channel;
117 };
118
119 /*
120 * Lookup functions. NULL is returned if not found.
121 */
122 struct ltt_kernel_event *trace_kernel_get_event_by_name(
123 char *name, struct ltt_kernel_channel *channel,
124 enum lttng_event_type type);
125 struct ltt_kernel_event *trace_kernel_find_event(
126 char *name, struct ltt_kernel_channel *channel,
127 enum lttng_event_type type,
128 struct lttng_filter_bytecode *filter);
129 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
130 char *name, struct ltt_kernel_session *session);
131
132 /*
133 * Create functions malloc() the data structure.
134 */
135 struct ltt_kernel_session *trace_kernel_create_session(void);
136 struct ltt_kernel_channel *trace_kernel_create_channel(
137 struct lttng_channel *chan);
138 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev,
139 char *filter_expression, struct lttng_filter_bytecode *filter);
140 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
141 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
142 unsigned int count);
143 struct ltt_kernel_context *trace_kernel_create_context(
144 struct lttng_kernel_context *ctx);
145
146 /*
147 * Destroy functions free() the data structure and remove from linked list if
148 * it's applies.
149 */
150 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
151 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
152 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
153 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
154 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
155 void trace_kernel_destroy_context(struct ltt_kernel_context *ctx);
156
157 #endif /* _LTT_TRACE_KERNEL_H */
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