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authorSteven Rostedt <srostedt@redhat.com>2009-04-13 12:25:37 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-14 12:57:59 -0400
commitf42c85e74faa422cf0bc747ed808681145448f88 (patch)
tree3775dc0a402f7da5247aa8ceb92ae89590038199 /kernel
parent97f2025153499faa17267a0d4e18c7afaf73f39d (diff)
tracing/events: move the ftrace event tracing code to core
This patch moves the ftrace creation into include/trace/ftrace.h and simplifies the work of developers in adding new tracepoints. Just the act of creating the trace points in include/trace and including define_trace.h will create the events in the debugfs/tracing/events directory. This patch removes the need of include/trace/trace_events.h Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/Makefile1
-rw-r--r--kernel/trace/events.c15
-rw-r--r--kernel/trace/trace_events_stage_1.h39
-rw-r--r--kernel/trace/trace_events_stage_2.h170
-rw-r--r--kernel/trace/trace_events_stage_3.h279
5 files changed, 0 insertions, 504 deletions
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 3ad367e7c97f..fb9d7f964898 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -41,7 +41,6 @@ obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
41obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o 41obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
42obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o 42obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
43obj-$(CONFIG_EVENT_TRACING) += trace_events.o 43obj-$(CONFIG_EVENT_TRACING) += trace_events.o
44obj-$(CONFIG_EVENT_TRACER) += events.o
45obj-$(CONFIG_EVENT_TRACING) += trace_export.o 44obj-$(CONFIG_EVENT_TRACING) += trace_export.o
46obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o 45obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
47obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o 46obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o
diff --git a/kernel/trace/events.c b/kernel/trace/events.c
deleted file mode 100644
index 5a35a914f0e2..000000000000
--- a/kernel/trace/events.c
+++ /dev/null
@@ -1,15 +0,0 @@
1/*
2 * This is the place to register all trace points as events.
3 */
4
5#include <linux/stringify.h>
6
7#include <trace/trace_events.h>
8
9#include "trace_output.h"
10
11#define TRACE_HEADER_MULTI_READ
12#include "trace_events_stage_1.h"
13#include "trace_events_stage_2.h"
14#include "trace_events_stage_3.h"
15
diff --git a/kernel/trace/trace_events_stage_1.h b/kernel/trace/trace_events_stage_1.h
deleted file mode 100644
index 475f46a047ae..000000000000
--- a/kernel/trace/trace_events_stage_1.h
+++ /dev/null
@@ -1,39 +0,0 @@
1/*
2 * Stage 1 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * struct ftrace_raw_<call> {
7 * struct trace_entry ent;
8 * <type> <item>;
9 * <type2> <item2>[<len>];
10 * [...]
11 * };
12 *
13 * The <type> <item> is created by the __field(type, item) macro or
14 * the __array(type2, item2, len) macro.
15 * We simply do "type item;", and that will create the fields
16 * in the structure.
17 */
18
19#undef TRACE_FORMAT
20#define TRACE_FORMAT(call, proto, args, fmt)
21
22#undef __array
23#define __array(type, item, len) type item[len];
24
25#undef __field
26#define __field(type, item) type item;
27
28#undef TP_STRUCT__entry
29#define TP_STRUCT__entry(args...) args
30
31#undef TRACE_EVENT
32#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
33 struct ftrace_raw_##name { \
34 struct trace_entry ent; \
35 tstruct \
36 }; \
37 static struct ftrace_event_call event_##name
38
39#include <trace/trace_events.h>
diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h
deleted file mode 100644
index aa4a67a0656f..000000000000
--- a/kernel/trace/trace_events_stage_2.h
+++ /dev/null
@@ -1,170 +0,0 @@
1/*
2 * Stage 2 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * enum print_line_t
7 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
8 * {
9 * struct trace_seq *s = &iter->seq;
10 * struct ftrace_raw_<call> *field; <-- defined in stage 1
11 * struct trace_entry *entry;
12 * int ret;
13 *
14 * entry = iter->ent;
15 *
16 * if (entry->type != event_<call>.id) {
17 * WARN_ON_ONCE(1);
18 * return TRACE_TYPE_UNHANDLED;
19 * }
20 *
21 * field = (typeof(field))entry;
22 *
23 * ret = trace_seq_printf(s, <TP_printk> "\n");
24 * if (!ret)
25 * return TRACE_TYPE_PARTIAL_LINE;
26 *
27 * return TRACE_TYPE_HANDLED;
28 * }
29 *
30 * This is the method used to print the raw event to the trace
31 * output format. Note, this is not needed if the data is read
32 * in binary.
33 */
34
35#undef __entry
36#define __entry field
37
38#undef TP_printk
39#define TP_printk(fmt, args...) fmt "\n", args
40
41#undef TRACE_EVENT
42#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
43enum print_line_t \
44ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
45{ \
46 struct trace_seq *s = &iter->seq; \
47 struct ftrace_raw_##call *field; \
48 struct trace_entry *entry; \
49 int ret; \
50 \
51 entry = iter->ent; \
52 \
53 if (entry->type != event_##call.id) { \
54 WARN_ON_ONCE(1); \
55 return TRACE_TYPE_UNHANDLED; \
56 } \
57 \
58 field = (typeof(field))entry; \
59 \
60 ret = trace_seq_printf(s, #call ": " print); \
61 if (!ret) \
62 return TRACE_TYPE_PARTIAL_LINE; \
63 \
64 return TRACE_TYPE_HANDLED; \
65}
66
67#include <trace/trace_events.h>
68
69/*
70 * Setup the showing format of trace point.
71 *
72 * int
73 * ftrace_format_##call(struct trace_seq *s)
74 * {
75 * struct ftrace_raw_##call field;
76 * int ret;
77 *
78 * ret = trace_seq_printf(s, #type " " #item ";"
79 * " offset:%u; size:%u;\n",
80 * offsetof(struct ftrace_raw_##call, item),
81 * sizeof(field.type));
82 *
83 * }
84 */
85
86#undef TP_STRUCT__entry
87#define TP_STRUCT__entry(args...) args
88
89#undef __field
90#define __field(type, item) \
91 ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
92 "offset:%u;\tsize:%u;\n", \
93 (unsigned int)offsetof(typeof(field), item), \
94 (unsigned int)sizeof(field.item)); \
95 if (!ret) \
96 return 0;
97
98#undef __array
99#define __array(type, item, len) \
100 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
101 "offset:%u;\tsize:%u;\n", \
102 (unsigned int)offsetof(typeof(field), item), \
103 (unsigned int)sizeof(field.item)); \
104 if (!ret) \
105 return 0;
106
107#undef __entry
108#define __entry REC
109
110#undef TP_printk
111#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
112
113#undef TP_fast_assign
114#define TP_fast_assign(args...) args
115
116#undef TRACE_EVENT
117#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
118static int \
119ftrace_format_##call(struct trace_seq *s) \
120{ \
121 struct ftrace_raw_##call field; \
122 int ret; \
123 \
124 tstruct; \
125 \
126 trace_seq_printf(s, "\nprint fmt: " print); \
127 \
128 return ret; \
129}
130
131#include <trace/trace_events.h>
132
133#undef __field
134#define __field(type, item) \
135 ret = trace_define_field(event_call, #type, #item, \
136 offsetof(typeof(field), item), \
137 sizeof(field.item)); \
138 if (ret) \
139 return ret;
140
141#undef __array
142#define __array(type, item, len) \
143 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
144 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
145 offsetof(typeof(field), item), \
146 sizeof(field.item)); \
147 if (ret) \
148 return ret;
149
150#undef TRACE_EVENT
151#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
152int \
153ftrace_define_fields_##call(void) \
154{ \
155 struct ftrace_raw_##call field; \
156 struct ftrace_event_call *event_call = &event_##call; \
157 int ret; \
158 \
159 __common_field(unsigned char, type); \
160 __common_field(unsigned char, flags); \
161 __common_field(unsigned char, preempt_count); \
162 __common_field(int, pid); \
163 __common_field(int, tgid); \
164 \
165 tstruct; \
166 \
167 return ret; \
168}
169
170#include <trace/trace_events.h>
diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
deleted file mode 100644
index 45c04e1f38db..000000000000
--- a/kernel/trace/trace_events_stage_3.h
+++ /dev/null
@@ -1,279 +0,0 @@
1/*
2 * Stage 3 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * static void ftrace_event_<call>(proto)
7 * {
8 * event_trace_printk(_RET_IP_, "<call>: " <fmt>);
9 * }
10 *
11 * static int ftrace_reg_event_<call>(void)
12 * {
13 * int ret;
14 *
15 * ret = register_trace_<call>(ftrace_event_<call>);
16 * if (!ret)
17 * pr_info("event trace: Could not activate trace point "
18 * "probe to <call>");
19 * return ret;
20 * }
21 *
22 * static void ftrace_unreg_event_<call>(void)
23 * {
24 * unregister_trace_<call>(ftrace_event_<call>);
25 * }
26 *
27 * For those macros defined with TRACE_FORMAT:
28 *
29 * static struct ftrace_event_call __used
30 * __attribute__((__aligned__(4)))
31 * __attribute__((section("_ftrace_events"))) event_<call> = {
32 * .name = "<call>",
33 * .regfunc = ftrace_reg_event_<call>,
34 * .unregfunc = ftrace_unreg_event_<call>,
35 * }
36 *
37 *
38 * For those macros defined with TRACE_EVENT:
39 *
40 * static struct ftrace_event_call event_<call>;
41 *
42 * static void ftrace_raw_event_<call>(proto)
43 * {
44 * struct ring_buffer_event *event;
45 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
46 * unsigned long irq_flags;
47 * int pc;
48 *
49 * local_save_flags(irq_flags);
50 * pc = preempt_count();
51 *
52 * event = trace_current_buffer_lock_reserve(event_<call>.id,
53 * sizeof(struct ftrace_raw_<call>),
54 * irq_flags, pc);
55 * if (!event)
56 * return;
57 * entry = ring_buffer_event_data(event);
58 *
59 * <assign>; <-- Here we assign the entries by the __field and
60 * __array macros.
61 *
62 * trace_current_buffer_unlock_commit(event, irq_flags, pc);
63 * }
64 *
65 * static int ftrace_raw_reg_event_<call>(void)
66 * {
67 * int ret;
68 *
69 * ret = register_trace_<call>(ftrace_raw_event_<call>);
70 * if (!ret)
71 * pr_info("event trace: Could not activate trace point "
72 * "probe to <call>");
73 * return ret;
74 * }
75 *
76 * static void ftrace_unreg_event_<call>(void)
77 * {
78 * unregister_trace_<call>(ftrace_raw_event_<call>);
79 * }
80 *
81 * static struct trace_event ftrace_event_type_<call> = {
82 * .trace = ftrace_raw_output_<call>, <-- stage 2
83 * };
84 *
85 * static int ftrace_raw_init_event_<call>(void)
86 * {
87 * int id;
88 *
89 * id = register_ftrace_event(&ftrace_event_type_<call>);
90 * if (!id)
91 * return -ENODEV;
92 * event_<call>.id = id;
93 * return 0;
94 * }
95 *
96 * static struct ftrace_event_call __used
97 * __attribute__((__aligned__(4)))
98 * __attribute__((section("_ftrace_events"))) event_<call> = {
99 * .name = "<call>",
100 * .system = "<system>",
101 * .raw_init = ftrace_raw_init_event_<call>,
102 * .regfunc = ftrace_reg_event_<call>,
103 * .unregfunc = ftrace_unreg_event_<call>,
104 * .show_format = ftrace_format_<call>,
105 * }
106 *
107 */
108
109#undef TP_FMT
110#define TP_FMT(fmt, args...) fmt "\n", ##args
111
112#ifdef CONFIG_EVENT_PROFILE
113#define _TRACE_PROFILE(call, proto, args) \
114static void ftrace_profile_##call(proto) \
115{ \
116 extern void perf_tpcounter_event(int); \
117 perf_tpcounter_event(event_##call.id); \
118} \
119 \
120static int ftrace_profile_enable_##call(struct ftrace_event_call *call) \
121{ \
122 int ret = 0; \
123 \
124 if (!atomic_inc_return(&call->profile_count)) \
125 ret = register_trace_##call(ftrace_profile_##call); \
126 \
127 return ret; \
128} \
129 \
130static void ftrace_profile_disable_##call(struct ftrace_event_call *call) \
131{ \
132 if (atomic_add_negative(-1, &call->profile_count)) \
133 unregister_trace_##call(ftrace_profile_##call); \
134}
135
136#define _TRACE_PROFILE_INIT(call) \
137 .profile_count = ATOMIC_INIT(-1), \
138 .profile_enable = ftrace_profile_enable_##call, \
139 .profile_disable = ftrace_profile_disable_##call,
140
141#else
142#define _TRACE_PROFILE(call, proto, args)
143#define _TRACE_PROFILE_INIT(call)
144#endif
145
146#define _TRACE_FORMAT(call, proto, args, fmt) \
147static void ftrace_event_##call(proto) \
148{ \
149 event_trace_printk(_RET_IP_, #call ": " fmt); \
150} \
151 \
152static int ftrace_reg_event_##call(void) \
153{ \
154 int ret; \
155 \
156 ret = register_trace_##call(ftrace_event_##call); \
157 if (ret) \
158 pr_info("event trace: Could not activate trace point " \
159 "probe to " #call "\n"); \
160 return ret; \
161} \
162 \
163static void ftrace_unreg_event_##call(void) \
164{ \
165 unregister_trace_##call(ftrace_event_##call); \
166} \
167 \
168static struct ftrace_event_call event_##call; \
169 \
170static int ftrace_init_event_##call(void) \
171{ \
172 int id; \
173 \
174 id = register_ftrace_event(NULL); \
175 if (!id) \
176 return -ENODEV; \
177 event_##call.id = id; \
178 return 0; \
179}
180
181#undef TRACE_FORMAT
182#define TRACE_FORMAT(call, proto, args, fmt) \
183_TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \
184_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
185static struct ftrace_event_call __used \
186__attribute__((__aligned__(4))) \
187__attribute__((section("_ftrace_events"))) event_##call = { \
188 .name = #call, \
189 .system = __stringify(TRACE_SYSTEM), \
190 .raw_init = ftrace_init_event_##call, \
191 .regfunc = ftrace_reg_event_##call, \
192 .unregfunc = ftrace_unreg_event_##call, \
193 _TRACE_PROFILE_INIT(call) \
194}
195
196#undef __entry
197#define __entry entry
198
199#undef TRACE_EVENT
200#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
201_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
202 \
203static struct ftrace_event_call event_##call; \
204 \
205static void ftrace_raw_event_##call(proto) \
206{ \
207 struct ftrace_event_call *call = &event_##call; \
208 struct ring_buffer_event *event; \
209 struct ftrace_raw_##call *entry; \
210 unsigned long irq_flags; \
211 int pc; \
212 \
213 local_save_flags(irq_flags); \
214 pc = preempt_count(); \
215 \
216 event = trace_current_buffer_lock_reserve(event_##call.id, \
217 sizeof(struct ftrace_raw_##call), \
218 irq_flags, pc); \
219 if (!event) \
220 return; \
221 entry = ring_buffer_event_data(event); \
222 \
223 assign; \
224 \
225 if (!filter_current_check_discard(call, entry, event)) \
226 trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
227} \
228 \
229static int ftrace_raw_reg_event_##call(void) \
230{ \
231 int ret; \
232 \
233 ret = register_trace_##call(ftrace_raw_event_##call); \
234 if (ret) \
235 pr_info("event trace: Could not activate trace point " \
236 "probe to " #call "\n"); \
237 return ret; \
238} \
239 \
240static void ftrace_raw_unreg_event_##call(void) \
241{ \
242 unregister_trace_##call(ftrace_raw_event_##call); \
243} \
244 \
245static struct trace_event ftrace_event_type_##call = { \
246 .trace = ftrace_raw_output_##call, \
247}; \
248 \
249static int ftrace_raw_init_event_##call(void) \
250{ \
251 int id; \
252 \
253 id = register_ftrace_event(&ftrace_event_type_##call); \
254 if (!id) \
255 return -ENODEV; \
256 event_##call.id = id; \
257 INIT_LIST_HEAD(&event_##call.fields); \
258 init_preds(&event_##call); \
259 return 0; \
260} \
261 \
262static struct ftrace_event_call __used \
263__attribute__((__aligned__(4))) \
264__attribute__((section("_ftrace_events"))) event_##call = { \
265 .name = #call, \
266 .system = __stringify(TRACE_SYSTEM), \
267 .raw_init = ftrace_raw_init_event_##call, \
268 .regfunc = ftrace_raw_reg_event_##call, \
269 .unregfunc = ftrace_raw_unreg_event_##call, \
270 .show_format = ftrace_format_##call, \
271 .define_fields = ftrace_define_fields_##call, \
272 _TRACE_PROFILE_INIT(call) \
273}
274
275#include <trace/trace_events.h>
276
277#undef _TRACE_PROFILE
278#undef _TRACE_PROFILE_INIT
279
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