Commit 0dfceeff authored by Tzvetomir Stoyanov (VMware)'s avatar Tzvetomir Stoyanov (VMware) Committed by Arnaldo Carvalho de Melo
Browse files

tools lib traceevent: Move kernel_stack event handler to "function" plugin. 

The "kernel_stack" event handler does not depend on any trace-cmd
context, it can be used aside from the application. The code is moved to
libtraceevent "function" plugin.

Link: http://lore.kernel.org/linux-trace-devel/20190726124308.18735-2-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/linux-trace-devel/20200702174950.123454-4-tz.stoyanov@gmail.com



Signed-off-by: default avatarTzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200702185705.284789930@goodmis.org


Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 5973e6eb

tools/lib/traceevent/plugins/plugin_function.c

+41 −0
Original line number Diff line number Diff line
@@ -184,11 +184,52 @@ static int function_handler(struct trace_seq *s, struct tep_record *record, 
	return 0;

}



static int

trace_stack_handler(struct trace_seq *s, struct tep_record *record,

		    struct tep_event *event, void *context)

{

	struct tep_format_field *field;

	unsigned long long addr;

	const char *func;

	int long_size;

	void *data = record->data;



	field = tep_find_any_field(event, "caller");

	if (!field) {

		trace_seq_printf(s, "<CANT FIND FIELD %s>", "caller");

		return 0;

	}



	trace_seq_puts(s, "<stack trace >\n");



	long_size = tep_get_long_size(event->tep);



	for (data += field->offset; data < record->data + record->size;

	     data += long_size) {

		addr = tep_read_number(event->tep, data, long_size);



		if ((long_size == 8 && addr == (unsigned long long)-1) ||

		    ((int)addr == -1))

			break;



		func = tep_find_function(event->tep, addr);

		if (func)

			trace_seq_printf(s, "=> %s (%llx)\n", func, addr);

		else

			trace_seq_printf(s, "=> %llx\n", addr);

	}



	return 0;

}



int TEP_PLUGIN_LOADER(struct tep_handle *tep)

{

	tep_register_event_handler(tep, -1, "ftrace", "function",

				   function_handler, NULL);



	tep_register_event_handler(tep, -1, "ftrace", "kernel_stack",

				      trace_stack_handler, NULL);



	tep_plugin_add_options("ftrace", plugin_options);



	return 0;