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rtla/trace: Add trace event filter helpers

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Add a set of helper functions to allow rtla tools to filter events
in the trace instance.

Link: https://lkml.kernel.org/r/12623b1684684549d53b90f4bf66fae44584fd14.1646247211.git.bristot@kernel.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-03-02 20:01:34 +01:00 committed by Steven Rostedt (Google)
parent 1a75489365
commit 5487b6ce26
2 changed files with 86 additions and 0 deletions
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83
tools/tracing/rtla/src/trace.c
View File

@ -204,6 +204,8 @@ static void trace_events_free(struct trace_events *events)
tevent = tevent->next;
if (free_event->filter)
free(free_event->filter);
if (free_event->trigger)
free(free_event->trigger);
free(free_event->system);
@ -237,6 +239,21 @@ struct trace_events *trace_event_alloc(const char *event_string)
return tevent;
}
/*
* trace_event_add_filter - record an event filter
*/
int trace_event_add_filter(struct trace_events *event, char *filter)
{
if (event->filter)
free(event->filter);
event->filter = strdup(filter);
if (!event->filter)
return 1;
return 0;
}
/*
* trace_event_add_trigger - record an event trigger action
*/
@ -252,6 +269,33 @@ int trace_event_add_trigger(struct trace_events *event, char *trigger)
return 0;
}
/*
* trace_event_disable_filter - disable an event filter
*/
static void trace_event_disable_filter(struct trace_instance *instance,
struct trace_events *tevent)
{
char filter[1024];
int retval;
if (!tevent->filter)
return;
if (!tevent->filter_enabled)
return;
debug_msg("Disabling %s:%s filter %s\n", tevent->system,
tevent->event ? : "*", tevent->filter);
snprintf(filter, 1024, "!%s\n", tevent->filter);
retval = tracefs_event_file_write(instance->inst, tevent->system,
tevent->event, "filter", filter);
if (retval < 0)
err_msg("Error disabling %s:%s filter %s\n", tevent->system,
tevent->event ? : "*", tevent->filter);
}
/*
* trace_event_disable_trigger - disable an event trigger
*/
@ -293,6 +337,7 @@ void trace_events_disable(struct trace_instance *instance,
while (tevent) {
debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");
if (tevent->enabled) {
trace_event_disable_filter(instance, tevent);
trace_event_disable_trigger(instance, tevent);
tracefs_event_disable(instance->inst, tevent->system, tevent->event);
}
@ -302,6 +347,41 @@ void trace_events_disable(struct trace_instance *instance,
}
}
/*
* trace_event_enable_filter - enable an event filter associated with an event
*/
static int trace_event_enable_filter(struct trace_instance *instance,
struct trace_events *tevent)
{
char filter[1024];
int retval;
if (!tevent->filter)
return 0;
if (!tevent->event) {
err_msg("Filter %s applies only for single events, not for all %s:* events\n",
tevent->filter, tevent->system);
return 1;
}
snprintf(filter, 1024, "%s\n", tevent->filter);
debug_msg("Enabling %s:%s filter %s\n", tevent->system,
tevent->event ? : "*", tevent->filter);
retval = tracefs_event_file_write(instance->inst, tevent->system,
tevent->event, "filter", filter);
if (retval < 0) {
err_msg("Error enabling %s:%s filter %s\n", tevent->system,
tevent->event ? : "*", tevent->filter);
return 1;
}
tevent->filter_enabled = 1;
return 0;
}
/*
* trace_event_enable_trigger - enable an event trigger associated with an event
*/
@ -356,6 +436,9 @@ int trace_events_enable(struct trace_instance *instance,
return 1;
}
retval = trace_event_enable_filter(instance, tevent);
if (retval)
return 1;
retval = trace_event_enable_trigger(instance, tevent);
if (retval)

3
tools/tracing/rtla/src/trace.h
View File

@ -6,8 +6,10 @@ struct trace_events {
struct trace_events *next;
char *system;
char *event;
char *filter;
char *trigger;
char enabled;
char filter_enabled;
char trigger_enabled;
};
@ -43,4 +45,5 @@ void trace_events_destroy(struct trace_instance *instance,
int trace_events_enable(struct trace_instance *instance,
struct trace_events *events);
int trace_event_add_filter(struct trace_events *event, char *filter);
int trace_event_add_trigger(struct trace_events *event, char *trigger);