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tracing/filters: add TRACE_EVENT_FORMAT_NOFILTER event macro

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Frederic Weisbecker suggested that the trace_special event shouldn't be
filterable; this patch adds a TRACE_EVENT_FORMAT_NOFILTER event macro
that allows an event format to be exported without having a filter
attached, and removes filtering from the trace_special event.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-03-31 00:49:16 -05:00 committed by Ingo Molnar
parent e1112b4d96
commit e45f2e2bd2
4 changed files with 36 additions and 3 deletions
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2
kernel/trace/trace.c
View File

@ -1064,7 +1064,6 @@ ftrace_trace_special(void *__tr,
unsigned long arg1, unsigned long arg2, unsigned long arg3,
int pc)
{
struct ftrace_event_call *call = &event_special;
struct ring_buffer_event *event;
struct trace_array *tr = __tr;
struct special_entry *entry;
@ -1077,7 +1076,6 @@ ftrace_trace_special(void *__tr,
entry->arg1 = arg1;
entry->arg2 = arg2;
entry->arg3 = arg3;
filter_check_discard(call, entry, event);
trace_buffer_unlock_commit(tr, event, 0, pc);
}

2
kernel/trace/trace.h
View File

@ -915,6 +915,8 @@ do { \
#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
extern struct ftrace_event_call event_##call;
#undef TRACE_EVENT_FORMAT_NOFILTER
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt)
#include "trace_event_types.h"
#endif /* _LINUX_KERNEL_TRACE_H */

2
kernel/trace/trace_event_types.h
View File

@ -57,7 +57,7 @@ TRACE_EVENT_FORMAT(context_switch, TRACE_CTX, ctx_switch_entry, ignore,
TP_RAW_FMT("%u:%u:%u ==+ %u:%u:%u [%03u]")
);
TRACE_EVENT_FORMAT(special, TRACE_SPECIAL, special_entry, ignore,
TRACE_EVENT_FORMAT_NOFILTER(special, TRACE_SPECIAL, special_entry, ignore,
TRACE_STRUCT(
TRACE_FIELD(unsigned long, arg1, arg1)
TRACE_FIELD(unsigned long, arg2, arg2)

33
kernel/trace/trace_export.c
View File

@ -65,6 +65,22 @@ ftrace_format_##call(struct trace_seq *s) \
return ret; \
}
#undef TRACE_EVENT_FORMAT_NOFILTER
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
tpfmt) \
static int \
ftrace_format_##call(struct trace_seq *s) \
{ \
struct args field; \
int ret; \
\
tstruct; \
\
trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
\
return ret; \
}
#include "trace_event_types.h"
#undef TRACE_ZERO_CHAR
@ -109,6 +125,19 @@ static int ftrace_raw_init_event_##call(void) \
return 0; \
} \
#undef TRACE_EVENT_FORMAT_NOFILTER
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
tpfmt) \
\
struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.id = proto, \
.system = __stringify(TRACE_SYSTEM), \
.show_format = ftrace_format_##call, \
};
#include "trace_event_types.h"
#undef TRACE_FIELD
@ -150,4 +179,8 @@ ftrace_define_fields_##call(void) \
return ret; \
}
#undef TRACE_EVENT_FORMAT_NOFILTER
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
tpfmt)
#include "trace_event_types.h"