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tracing: add run-time field descriptions for event filtering

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This patch makes the field descriptions defined for event tracing
available at run-time, for the event-filtering mechanism introduced
in a subsequent patch.

The common event fields are prepended with 'common_' in the format
display, allowing them to be distinguished from the other fields
that might internally have same name and can therefore be
unambiguously used in filters.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237710639.7703.46.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi
2009-03-22 03:30:39 -05:00
committed by Ingo Molnar
parent 0cf53ff62b
commit cf027f645e
4 changed files with 107 additions and 10 deletions
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30
kernel/trace/trace.h
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@@ -775,16 +775,26 @@ enum {
TRACE_EVENT_TYPE_RAW = 2,
};
struct ftrace_event_field {
struct list_head link;
char *name;
char *type;
int offset;
int size;
};
struct ftrace_event_call {
char *name;
char *system;
struct dentry *dir;
int enabled;
int (*regfunc)(void);
void (*unregfunc)(void);
int id;
int (*raw_init)(void);
int (*show_format)(struct trace_seq *s);
char *name;
char *system;
struct dentry *dir;
int enabled;
int (*regfunc)(void);
void (*unregfunc)(void);
int id;
int (*raw_init)(void);
int (*show_format)(struct trace_seq *s);
int (*define_fields)(void);
struct list_head fields;
#ifdef CONFIG_EVENT_PROFILE
atomic_t profile_count;
@@ -793,6 +803,8 @@ struct ftrace_event_call {
#endif
};
int trace_define_field(struct ftrace_event_call *call, char *type,
char *name, int offset, int size);
void event_trace_printk(unsigned long ip, const char *fmt, ...);
extern struct ftrace_event_call __start_ftrace_events[];
extern struct ftrace_event_call __stop_ftrace_events[];