Commit c3e49506 authored by Tom Zanussi's avatar Tom Zanussi Committed by Steven Rostedt (VMware)
Browse files

tracing: Split up onmatch action data 

Currently, the onmatch action data binds the onmatch action to data
related to synthetic event generation.  Since we want to allow the
onmatch handler to potentially invoke a different action, and because
we expect other handlers to generate synthetic events, we need to
separate the data related to these two functions.

Also rename the onmatch data to something more descriptive, and create
and use common action data destroy function.

Link: http://lkml.kernel.org/r/b9abbf9aae69fe3920cdc8ddbcaad544dd258d78.1550100284.git.tom.zanussi@linux.intel.com



Signed-off-by: default avatarTom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 5032b381

kernel/trace/trace.c

+11 −1
Original line number Diff line number Diff line
@@ -4700,6 +4700,7 @@ static const char readme_msg[] = 
	"\t            [:size=#entries]\n"

	"\t            [:pause][:continue][:clear]\n"

	"\t            [:name=histname1]\n"

	"\t            [:<handler>.<action>]\n"

	"\t            [if <filter>]\n\n"

	"\t    When a matching event is hit, an entry is added to a hash\n"

	"\t    table using the key(s) and value(s) named, and the value of a\n"
@@ -4741,7 +4742,16 @@ static const char readme_msg[] = 
	"\t    The enable_hist and disable_hist triggers can be used to\n"

	"\t    have one event conditionally start and stop another event's\n"

	"\t    already-attached hist trigger.  The syntax is analagous to\n"

	"\t    the enable_event and disable_event triggers.\n"

	"\t    the enable_event and disable_event triggers.\n\n"

	"\t    Hist trigger handlers and actions are executed whenever a\n"

	"\t    a histogram entry is added or updated.  They take the form:\n\n"

	"\t        <handler>.<action>\n\n"

	"\t    The available handlers are:\n\n"

	"\t        onmatch(matching.event)  - invoke on addition or update\n"

	"\t        onmax(var)               - invoke if var exceeds current max\n\n"

	"\t    The available actions are:\n\n"

	"\t        <synthetic_event>(param list)        - generate synthetic event\n"

	"\t        save(field,...)                      - save current event fields\n"

#endif

;

kernel/trace/trace_events_hist.c

+52 −51
Original line number Diff line number Diff line
@@ -405,8 +405,6 @@ struct action_data { 
	unsigned int		n_params;

	char			*params[SYNTH_FIELDS_MAX];



	union {

		struct {

	/*

	 * When a histogram trigger is hit, the values of any

	 * references to variables, including variables being passed
@@ -416,10 +414,13 @@ struct action_data { 
	 * event invocation.

	 */

	unsigned int		var_ref_idx;

			char			*match_event;

			char			*match_event_system;

	struct synth_event	*synth_event;

		} onmatch;



	union {

		struct {

			char			*event;

			char			*event_system;

		} match_data;



		struct {

			char			*var_str;
@@ -1093,9 +1094,9 @@ static void action_trace(struct hist_trigger_data *hist_data, 
			 struct ring_buffer_event *rbe, void *key,

			 struct action_data *data, u64 *var_ref_vals)

{

	struct synth_event *event = data->onmatch.synth_event;

	struct synth_event *event = data->synth_event;



	trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx);

	trace_synth(event, var_ref_vals, data->var_ref_idx);

}



struct hist_var_data {
@@ -1657,8 +1658,8 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name) 
		struct action_data *data = hist_data->actions[i];



		if (data->handler == HANDLER_ONMATCH) {

			char *system = data->onmatch.match_event_system;

			char *event_name = data->onmatch.match_event;

			char *system = data->match_data.event_system;

			char *event_name = data->match_data.event;



			file = find_var_file(tr, system, event_name, var_name);

			if (!file)
@@ -3425,22 +3426,33 @@ static void onmax_save(struct hist_trigger_data *hist_data, 
	update_max_vars(hist_data, elt, rbe, rec);

}



static void onmax_destroy(struct action_data *data)

static void action_data_destroy(struct action_data *data)

{

	unsigned int i;



	destroy_hist_field(data->onmax.max_var, 0);

	destroy_hist_field(data->onmax.var, 0);

	lockdep_assert_held(&event_mutex);



	kfree(data->onmax.var_str);

	kfree(data->action_name);



	for (i = 0; i < data->n_params; i++)

		kfree(data->params[i]);



	if (data->synth_event)

		data->synth_event->ref--;



	kfree(data);

}



static void onmax_destroy(struct action_data *data)

{

	destroy_hist_field(data->onmax.max_var, 0);

	destroy_hist_field(data->onmax.var, 0);



	kfree(data->onmax.var_str);



	action_data_destroy(data);

}



static int action_create(struct hist_trigger_data *hist_data,

			 struct action_data *data);
@@ -3620,21 +3632,10 @@ static struct action_data *onmax_parse(char *str, enum handler_id handler) 


static void onmatch_destroy(struct action_data *data)

{

	unsigned int i;



	lockdep_assert_held(&event_mutex);

	kfree(data->match_data.event);

	kfree(data->match_data.event_system);



	kfree(data->onmatch.match_event);

	kfree(data->onmatch.match_event_system);

	kfree(data->action_name);



	for (i = 0; i < data->n_params; i++)

		kfree(data->params[i]);



	if (data->onmatch.synth_event)

		data->onmatch.synth_event->ref--;



	kfree(data);

	action_data_destroy(data);

}



static void destroy_field_var(struct field_var *field_var)
@@ -3695,8 +3696,8 @@ trace_action_find_var(struct hist_trigger_data *hist_data, 
	hist_field = find_target_event_var(hist_data, system, event, var);

	if (!hist_field) {

		if (!system && data->handler == HANDLER_ONMATCH) {

			system = data->onmatch.match_event_system;

			event = data->onmatch.match_event;

			system = data->match_data.event_system;

			event = data->match_data.event;

		}



		hist_field = find_event_var(hist_data, system, event, var);
@@ -3735,8 +3736,8 @@ trace_action_create_field_var(struct hist_trigger_data *hist_data, 
		 * event.

		 */

		if (!system && data->handler == HANDLER_ONMATCH) {

			system = data->onmatch.match_event_system;

			event = data->onmatch.match_event;

			system = data->match_data.event_system;

			event = data->match_data.event;

		}



		/*
@@ -3846,8 +3847,8 @@ static int trace_action_create(struct hist_trigger_data *hist_data, 
		goto err;

	}



	data->onmatch.synth_event = event;

	data->onmatch.var_ref_idx = var_ref_idx;

	data->synth_event = event;

	data->var_ref_idx = var_ref_idx;

 out:

	return ret;

 err:
@@ -3933,14 +3934,14 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str) 
		goto free;

	}



	data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL);

	if (!data->onmatch.match_event) {

	data->match_data.event = kstrdup(match_event, GFP_KERNEL);

	if (!data->match_data.event) {

		ret = -ENOMEM;

		goto free;

	}



	data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL);

	if (!data->onmatch.match_event_system) {

	data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);

	if (!data->match_data.event_system) {

		ret = -ENOMEM;

		goto free;

	}
@@ -4511,8 +4512,8 @@ static void print_onmatch_spec(struct seq_file *m, 
			       struct hist_trigger_data *hist_data,

			       struct action_data *data)

{

	seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,

		   data->onmatch.match_event);

	seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,

		   data->match_data.event);



	seq_printf(m, "%s(", data->action_name);
@@ -4550,11 +4551,11 @@ static bool actions_match(struct hist_trigger_data *hist_data, 
			return false;



		if (data->handler == HANDLER_ONMATCH) {

			if (strcmp(data->onmatch.match_event_system,

				   data_test->onmatch.match_event_system) != 0)

			if (strcmp(data->match_data.event_system,

				   data_test->match_data.event_system) != 0)

				return false;

			if (strcmp(data->onmatch.match_event,

				   data_test->onmatch.match_event) != 0)

			if (strcmp(data->match_data.event,

				   data_test->match_data.event) != 0)

				return false;

		} else if (data->handler == HANDLER_ONMAX) {

			if (strcmp(data->onmax.var_str,

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