Commit e45f2e2b authored by Tom Zanussi's avatar Tom Zanussi Committed by Ingo Molnar
Browse files

tracing/filters: add TRACE_EVENT_FORMAT_NOFILTER event macro 



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: default avatarTom Zanussi <tzanussi@gmail.com>
Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e1112b4d

kernel/trace/trace.c

+0 −2
Original line number Diff line number Diff line
@@ -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);

}

kernel/trace/trace.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

kernel/trace/trace_event_types.h

+1 −1
Original line number Diff line number Diff line
@@ -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)

kernel/trace/trace_export.c

+33 −0
Original line number Diff line number Diff line
@@ -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"

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