1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef TRACE__CONTROL_H
#define TRACE__CONTROL_H
#include "event-internal.h"
typedef struct TraceEventIter {
/* iter state */
size_t event;
size_t group;
/* filter conditions */
size_t group_id;
const char *pattern;
} TraceEventIter;
/**
* trace_event_iter_init_all:
* @iter: the event iterator struct
*
* Initialize the event iterator struct @iter,
* for all events.
*/
void trace_event_iter_init_all(TraceEventIter *iter);
/**
* trace_event_iter_init_pattern:
* @iter: the event iterator struct
* @pattern: pattern to filter events on name
*
* Initialize the event iterator struct @iter,
* using @pattern to filter out events
* with non-matching names.
*/
void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern);
/**
* trace_event_iter_init_group:
* @iter: the event iterator struct
* @group_id: group_id to filter events by group.
*
* Initialize the event iterator struct @iter,
* using @group_id to filter for events in the group.
*/
void trace_event_iter_init_group(TraceEventIter *iter, size_t group_id);
/**
* trace_event_iter_next:
* @iter: the event iterator struct
*
* Get the next event, if any. When this returns NULL,
* the iterator should no longer be used.
*
* Returns: the next event, or NULL if no more events exist
*/
TraceEvent *trace_event_iter_next(TraceEventIter *iter);
/**
* trace_event_name:
* @id: Event name.
*
* Search an event by its name.
*
* Returns: pointer to #TraceEvent or NULL if not found.
*/
TraceEvent *trace_event_name(const char *name);
/**
* trace_event_is_pattern:
*
* Whether the given string is an event name pattern.
*/
static bool trace_event_is_pattern(const char *str);
/**
* trace_event_get_id:
*
* Get the identifier of an event.
*/
static uint32_t trace_event_get_id(TraceEvent *ev);
/**
* trace_event_get_name:
*
* Get the name of an event.
*/
static const char * trace_event_get_name(TraceEvent *ev);
/**
* trace_event_get_state:
* @id: Event identifier name.
*
* Get the tracing state of an event, both static and the QEMU dynamic state.
*
* If the event has the disabled property, the check will have no performance
* impact.
*/
#define trace_event_get_state(id) \
((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
/**
* trace_event_get_state_backends:
* @id: Event identifier name.
*
* Get the tracing state of an event, both static and dynamic state from all
* compiled-in backends.
*
* If the event has the disabled property, the check will have no performance
* impact.
*
* Returns: true if at least one backend has the event enabled and the event
* does not have the disabled property.
*/
#define trace_event_get_state_backends(id) \
((id ##_ENABLED) && id ##_BACKEND_DSTATE())
/**
* trace_event_get_state_static:
* @id: Event identifier.
*
* Get the static tracing state of an event.
*
* Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
* be set to 1 or 0 according to the presence of the disabled property).
*/
static bool trace_event_get_state_static(TraceEvent *ev);
/**
* trace_event_get_state_dynamic:
*
* Get the dynamic tracing state of an event.
*
* If the event has the 'vcpu' property, gets the OR'ed state of all vCPUs.
*/
static bool trace_event_get_state_dynamic(TraceEvent *ev);
/**
* trace_event_set_state_dynamic:
*
* Set the dynamic tracing state of an event.
*
* If the event has the 'vcpu' property, sets the state on all vCPUs.
*
* Pre-condition: trace_event_get_state_static(ev) == true
*/
void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
/**
* trace_init_backends:
*
* Initialize the tracing backend.
*
* Returns: Whether the backends could be successfully initialized.
*/
bool trace_init_backends(void);
/**
* trace_init_file:
*
* Record the name of the output file for the tracing backend.
* Exits if no selected backend does not support specifying the
* output file, and a file was specified with "-trace file=...".
*/
void trace_init_file(void);
/**
* trace_list_events:
* @f: Where to send output.
*
* List all available events.
*/
void trace_list_events(FILE *f);
/**
* trace_enable_events:
* @line_buf: A string with a glob pattern of events to be enabled or,
* if the string starts with '-', disabled.
*
* Enable or disable matching events.
*/
void trace_enable_events(const char *line_buf);
/**
* Definition of QEMU options describing trace subsystem configuration
*/
extern QemuOptsList qemu_trace_opts;
/**
* trace_opt_parse:
* @optstr: A string argument of --trace command line argument
*
* Initialize tracing subsystem.
*/
void trace_opt_parse(const char *optstr);
/**
* trace_get_vcpu_event_count:
*
* Return the number of known vcpu-specific events
*/
uint32_t trace_get_vcpu_event_count(void);
#include "control-internal.h"
#endif /* TRACE__CONTROL_H */
|
