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Commit b628b3e6 authored by Steven Rostedt's avatar Steven Rostedt
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tracing: make the set_event and available_events subsystem aware 



This patch makes the event files, set_event and available_events
aware of the subsystem.

Now you can enable an entire subsystem with:

  echo 'irq:*' > set_event

Note: the '*' is not needed.

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
parent 6ecc2d1c

kernel/trace/trace_events.c

+40 −3
Original line number Diff line number Diff line
@@ -12,6 +12,8 @@ 


#include "trace_events.h"



#define TRACE_SYSTEM "TRACE_SYSTEM"



#define events_for_each(event)						\

	for (event = __start_ftrace_events;				\

	     (unsigned long)event < (unsigned long)__stop_ftrace_events; \
@@ -45,14 +47,47 @@ static void ftrace_clear_events(void) 
static int ftrace_set_clr_event(char *buf, int set)

{

	struct ftrace_event_call *call = __start_ftrace_events;

	char *event = NULL, *sub = NULL, *match;

	int ret = -EINVAL;



	/*

	 * The buf format can be <subsystem>:<event-name>

	 *  *:<event-name> means any event by that name.

	 *  :<event-name> is the same.

	 *

	 *  <subsystem>:* means all events in that subsystem

	 *  <subsystem>: means the same.

	 *

	 *  <name> (no ':') means all events in a subsystem with

	 *  the name <name> or any event that matches <name>

	 */



	match = strsep(&buf, ":");

	if (buf) {

		sub = match;

		event = buf;

		match = NULL;



		if (!strlen(sub) || strcmp(sub, "*") == 0)

			sub = NULL;

		if (!strlen(event) || strcmp(event, "*") == 0)

			event = NULL;

	}



	events_for_each(call) {



		if (!call->name)

			continue;



		if (strcmp(buf, call->name) != 0)

		if (match &&

		    strcmp(match, call->name) != 0 &&

		    strcmp(match, call->system) != 0)

			continue;



		if (sub && strcmp(sub, call->system) != 0)

			continue;



		if (event && strcmp(event, call->name) != 0)

			continue;



		if (set) {
@@ -68,9 +103,9 @@ static int ftrace_set_clr_event(char *buf, int set) 
			call->enabled = 0;

			call->unregfunc();

		}

		return 0;

		ret = 0;

	}

	return -EINVAL;

	return ret;

}



/* 128 should be much more than enough */
@@ -200,6 +235,8 @@ static int t_show(struct seq_file *m, void *v) 
{

	struct ftrace_event_call *call = v;



	if (strcmp(call->system, TRACE_SYSTEM) != 0)

		seq_printf(m, "%s:", call->system);

	seq_printf(m, "%s\n", call->name);



	return 0;