tracing: Add 'onmatch' hist trigger action support
Add an 'onmatch(matching.event).<synthetic_event_name>(param list)'
hist trigger action which is invoked with the set of variables or
event fields named in the 'param list'. The result is the generation
of a synthetic event that consists of the values contained in those
variables and/or fields at the time the invoking event was hit.
As an example the below defines a simple synthetic event using a
variable defined on the sched_wakeup_new event, and shows the event
definition with unresolved fields, since the sched_wakeup_new event
with the testpid variable hasn't been defined yet:
# echo 'wakeup_new_test pid_t pid; int prio' >> \
/sys/kernel/debug/tracing/synthetic_events
# cat /sys/kernel/debug/tracing/synthetic_events
wakeup_new_test pid_t pid; int prio
The following hist trigger both defines a testpid variable and
specifies an onmatch() trace action that uses that variable along with
a non-variable field to generate a wakeup_new_test synthetic event
whenever a sched_wakeup_new event occurs, which because of the 'if
comm == "cyclictest"' filter only happens when the executable is
cyclictest:
# echo 'hist:testpid=pid:keys=$testpid:\
onmatch(sched.sched_wakeup_new).wakeup_new_test($testpid, prio) \
if comm=="cyclictest"' >> \
/sys/kernel/debug/tracing/events/sched/sched_wakeup_new/trigger
Creating and displaying a histogram based on those events is now just
a matter of using the fields and new synthetic event in the
tracing/events/synthetic directory, as usual:
# echo 'hist:keys=pid,prio:sort=pid,prio' >> \
/sys/kernel/debug/tracing/events/synthetic/wakeup_new_test/trigger
Link: http://lkml.kernel.org/r/8c2a574bcb7530c876629c901ecd23911b14afe8.1516069914.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Rajvi Jingar <rajvi.jingar@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi
Steven Rostedt (VMware)
parent
02205a6752
commit
c282a386a3
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@ -285,6 +285,8 @@ struct hist_trigger_data {
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struct action_data *actions[HIST_ACTIONS_MAX];
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unsigned int n_actions;
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struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX];
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unsigned int n_synth_var_refs;
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struct field_var *field_vars[SYNTH_FIELDS_MAX];
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unsigned int n_field_vars;
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unsigned int n_field_var_str;
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@ -321,7 +323,18 @@ typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
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struct action_data {
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action_fn_t fn;
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unsigned int var_ref_idx;
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unsigned int n_params;
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char *params[SYNTH_FIELDS_MAX];
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union {
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struct {
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unsigned int var_ref_idx;
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char *match_event;
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char *match_event_system;
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char *synth_event_name;
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struct synth_event *synth_event;
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} onmatch;
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};
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};
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static LIST_HEAD(synth_event_list);
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@ -887,6 +900,21 @@ static struct synth_event *alloc_synth_event(char *event_name, int n_fields,
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return event;
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}
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static void action_trace(struct hist_trigger_data *hist_data,
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struct tracing_map_elt *elt, void *rec,
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struct ring_buffer_event *rbe,
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struct action_data *data, u64 *var_ref_vals)
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{
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struct synth_event *event = data->onmatch.synth_event;
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trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx);
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}
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struct hist_var_data {
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struct list_head list;
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struct hist_trigger_data *hist_data;
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};
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static void add_or_delete_synth_event(struct synth_event *event, int delete)
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{
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if (delete)
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@ -1124,11 +1152,6 @@ static u64 hist_field_timestamp(struct hist_field *hist_field,
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return ts;
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}
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struct hist_var_data {
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struct list_head list;
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struct hist_trigger_data *hist_data;
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};
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static struct hist_field *
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check_field_for_var_ref(struct hist_field *hist_field,
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struct hist_trigger_data *var_data,
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@ -1194,6 +1217,14 @@ static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
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return found;
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}
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for (i = 0; i < hist_data->n_synth_var_refs; i++) {
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hist_field = hist_data->synth_var_refs[i];
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found = check_field_for_var_refs(hist_data, hist_field,
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var_data, var_idx, 0);
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if (found)
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return found;
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}
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return found;
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}
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@ -1422,6 +1453,37 @@ static struct hist_field *find_file_var(struct trace_event_file *file,
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return NULL;
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}
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static struct hist_field *
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find_match_var(struct hist_trigger_data *hist_data, char *var_name)
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{
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struct trace_array *tr = hist_data->event_file->tr;
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struct hist_field *hist_field, *found = NULL;
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struct trace_event_file *file;
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unsigned int i;
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for (i = 0; i < hist_data->n_actions; i++) {
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struct action_data *data = hist_data->actions[i];
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if (data->fn == action_trace) {
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char *system = data->onmatch.match_event_system;
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char *event_name = data->onmatch.match_event;
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file = find_var_file(tr, system, event_name, var_name);
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if (!file)
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continue;
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hist_field = find_file_var(file, var_name);
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if (hist_field) {
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if (found) {
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return ERR_PTR(-EINVAL);
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}
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found = hist_field;
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}
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}
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}
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return found;
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}
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static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
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char *system,
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char *event_name,
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@ -1431,6 +1493,14 @@ static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
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struct hist_field *hist_field = NULL;
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struct trace_event_file *file;
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if (!system || !event_name) {
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hist_field = find_match_var(hist_data, var_name);
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if (IS_ERR(hist_field))
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return NULL;
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if (hist_field)
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return hist_field;
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}
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file = find_var_file(tr, system, event_name, var_name);
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if (!file)
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return NULL;
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@ -1622,11 +1692,21 @@ static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
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static int parse_action(char *str, struct hist_trigger_attrs *attrs)
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{
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int ret = 0;
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int ret = -EINVAL;
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if (attrs->n_actions >= HIST_ACTIONS_MAX)
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return ret;
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if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0)) {
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attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
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if (!attrs->action_str[attrs->n_actions]) {
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ret = -ENOMEM;
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return ret;
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}
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attrs->n_actions++;
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ret = 0;
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}
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return ret;
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}
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@ -2635,7 +2715,7 @@ find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
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*
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* Return: The variable created for the field.
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*/
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struct hist_field *
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static struct hist_field *
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create_field_var_hist(struct hist_trigger_data *target_hist_data,
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char *subsys_name, char *event_name, char *field_name)
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{
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@ -2748,7 +2828,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
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return event_var;
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}
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struct hist_field *
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static struct hist_field *
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find_target_event_var(struct hist_trigger_data *hist_data,
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char *subsys_name, char *event_name, char *var_name)
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{
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@ -2919,7 +2999,7 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
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*
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* Return: The variable created for the field.
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*/
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struct field_var *
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static struct field_var *
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create_target_field_var(struct hist_trigger_data *target_hist_data,
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char *subsys_name, char *event_name, char *var_name)
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{
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@ -2943,6 +3023,27 @@ create_target_field_var(struct hist_trigger_data *target_hist_data,
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return create_field_var(target_hist_data, file, var_name);
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}
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static void onmatch_destroy(struct action_data *data)
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{
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unsigned int i;
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mutex_lock(&synth_event_mutex);
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kfree(data->onmatch.match_event);
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kfree(data->onmatch.match_event_system);
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kfree(data->onmatch.synth_event_name);
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for (i = 0; i < data->n_params; i++)
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kfree(data->params[i]);
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if (data->onmatch.synth_event)
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data->onmatch.synth_event->ref--;
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kfree(data);
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mutex_unlock(&synth_event_mutex);
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}
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static void destroy_field_var(struct field_var *field_var)
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{
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if (!field_var)
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@ -2962,8 +3063,8 @@ static void destroy_field_vars(struct hist_trigger_data *hist_data)
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destroy_field_var(hist_data->field_vars[i]);
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}
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void save_field_var(struct hist_trigger_data *hist_data,
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struct field_var *field_var)
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static void save_field_var(struct hist_trigger_data *hist_data,
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struct field_var *field_var)
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{
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hist_data->field_vars[hist_data->n_field_vars++] = field_var;
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@ -2971,6 +3072,304 @@ void save_field_var(struct hist_trigger_data *hist_data,
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hist_data->n_field_var_str++;
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}
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static void destroy_synth_var_refs(struct hist_trigger_data *hist_data)
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{
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unsigned int i;
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for (i = 0; i < hist_data->n_synth_var_refs; i++)
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destroy_hist_field(hist_data->synth_var_refs[i], 0);
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}
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static void save_synth_var_ref(struct hist_trigger_data *hist_data,
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struct hist_field *var_ref)
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{
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hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref;
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hist_data->var_refs[hist_data->n_var_refs] = var_ref;
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var_ref->var_ref_idx = hist_data->n_var_refs++;
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}
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static int check_synth_field(struct synth_event *event,
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struct hist_field *hist_field,
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unsigned int field_pos)
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{
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struct synth_field *field;
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if (field_pos >= event->n_fields)
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return -EINVAL;
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field = event->fields[field_pos];
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if (strcmp(field->type, hist_field->type) != 0)
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return -EINVAL;
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return 0;
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}
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static int parse_action_params(char *params, struct action_data *data)
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{
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char *param, *saved_param;
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int ret = 0;
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while (params) {
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if (data->n_params >= SYNTH_FIELDS_MAX)
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goto out;
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param = strsep(¶ms, ",");
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if (!param) {
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ret = -EINVAL;
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goto out;
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}
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param = strstrip(param);
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if (strlen(param) < 2) {
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ret = -EINVAL;
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goto out;
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}
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saved_param = kstrdup(param, GFP_KERNEL);
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if (!saved_param) {
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ret = -ENOMEM;
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goto out;
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}
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data->params[data->n_params++] = saved_param;
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}
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out:
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return ret;
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}
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static struct hist_field *
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onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
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char *system, char *event, char *var)
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{
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struct hist_field *hist_field;
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var++; /* skip '$' */
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hist_field = find_target_event_var(hist_data, system, event, var);
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if (!hist_field) {
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if (!system) {
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system = data->onmatch.match_event_system;
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event = data->onmatch.match_event;
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}
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hist_field = find_event_var(hist_data, system, event, var);
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}
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return hist_field;
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}
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static struct hist_field *
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onmatch_create_field_var(struct hist_trigger_data *hist_data,
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struct action_data *data, char *system,
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char *event, char *var)
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{
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struct hist_field *hist_field = NULL;
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struct field_var *field_var;
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/*
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* First try to create a field var on the target event (the
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* currently being defined). This will create a variable for
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* unqualified fields on the target event, or if qualified,
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* target fields that have qualified names matching the target.
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*/
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field_var = create_target_field_var(hist_data, system, event, var);
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if (field_var && !IS_ERR(field_var)) {
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save_field_var(hist_data, field_var);
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hist_field = field_var->var;
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} else {
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field_var = NULL;
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/*
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* If no explicit system.event is specfied, default to
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* looking for fields on the onmatch(system.event.xxx)
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* event.
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*/
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if (!system) {
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system = data->onmatch.match_event_system;
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event = data->onmatch.match_event;
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}
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/*
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* At this point, we're looking at a field on another
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* event. Because we can't modify a hist trigger on
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* another event to add a variable for a field, we need
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* to create a new trigger on that event and create the
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* variable at the same time.
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*/
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hist_field = create_field_var_hist(hist_data, system, event, var);
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if (IS_ERR(hist_field))
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goto free;
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}
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out:
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return hist_field;
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free:
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destroy_field_var(field_var);
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hist_field = NULL;
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goto out;
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}
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static int onmatch_create(struct hist_trigger_data *hist_data,
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struct trace_event_file *file,
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struct action_data *data)
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{
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char *event_name, *param, *system = NULL;
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struct hist_field *hist_field, *var_ref;
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unsigned int i, var_ref_idx;
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unsigned int field_pos = 0;
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struct synth_event *event;
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int ret = 0;
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mutex_lock(&synth_event_mutex);
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event = find_synth_event(data->onmatch.synth_event_name);
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if (!event) {
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mutex_unlock(&synth_event_mutex);
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return -EINVAL;
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}
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event->ref++;
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mutex_unlock(&synth_event_mutex);
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var_ref_idx = hist_data->n_var_refs;
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for (i = 0; i < data->n_params; i++) {
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char *p;
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p = param = kstrdup(data->params[i], GFP_KERNEL);
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if (!param) {
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ret = -ENOMEM;
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goto err;
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}
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system = strsep(¶m, ".");
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if (!param) {
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param = (char *)system;
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system = event_name = NULL;
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} else {
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event_name = strsep(¶m, ".");
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if (!param) {
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kfree(p);
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ret = -EINVAL;
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goto err;
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}
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}
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if (param[0] == '$')
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hist_field = onmatch_find_var(hist_data, data, system,
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event_name, param);
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else
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hist_field = onmatch_create_field_var(hist_data, data,
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system,
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event_name,
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param);
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if (!hist_field) {
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kfree(p);
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ret = -EINVAL;
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goto err;
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}
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if (check_synth_field(event, hist_field, field_pos) == 0) {
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var_ref = create_var_ref(hist_field, system, event_name);
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if (!var_ref) {
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kfree(p);
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ret = -ENOMEM;
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goto err;
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}
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save_synth_var_ref(hist_data, var_ref);
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field_pos++;
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kfree(p);
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continue;
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}
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kfree(p);
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ret = -EINVAL;
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goto err;
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}
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if (field_pos != event->n_fields) {
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ret = -EINVAL;
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goto err;
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}
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data->fn = action_trace;
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data->onmatch.synth_event = event;
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data->onmatch.var_ref_idx = var_ref_idx;
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out:
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return ret;
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err:
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mutex_lock(&synth_event_mutex);
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event->ref--;
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mutex_unlock(&synth_event_mutex);
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goto out;
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}
|
||||
|
||||
static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
|
||||
{
|
||||
char *match_event, *match_event_system;
|
||||
char *synth_event_name, *params;
|
||||
struct action_data *data;
|
||||
int ret = -EINVAL;
|
||||
|
||||
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
match_event = strsep(&str, ")");
|
||||
if (!match_event || !str)
|
||||
goto free;
|
||||
|
||||
match_event_system = strsep(&match_event, ".");
|
||||
if (!match_event)
|
||||
goto free;
|
||||
|
||||
if (IS_ERR(event_file(tr, match_event_system, match_event)))
|
||||
goto free;
|
||||
|
||||
data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL);
|
||||
if (!data->onmatch.match_event) {
|
||||
ret = -ENOMEM;
|
||||
goto free;
|
||||
}
|
||||
|
||||
data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL);
|
||||
if (!data->onmatch.match_event_system) {
|
||||
ret = -ENOMEM;
|
||||
goto free;
|
||||
}
|
||||
|
||||
strsep(&str, ".");
|
||||
if (!str)
|
||||
goto free;
|
||||
|
||||
synth_event_name = strsep(&str, "(");
|
||||
if (!synth_event_name || !str)
|
||||
goto free;
|
||||
|
||||
data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL);
|
||||
if (!data->onmatch.synth_event_name) {
|
||||
ret = -ENOMEM;
|
||||
goto free;
|
||||
}
|
||||
|
||||
params = strsep(&str, ")");
|
||||
if (!params || !str || (str && strlen(str)))
|
||||
goto free;
|
||||
|
||||
ret = parse_action_params(params, data);
|
||||
if (ret)
|
||||
goto free;
|
||||
out:
|
||||
return data;
|
||||
free:
|
||||
onmatch_destroy(data);
|
||||
data = ERR_PTR(ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int create_hitcount_val(struct hist_trigger_data *hist_data)
|
||||
{
|
||||
hist_data->fields[HITCOUNT_IDX] =
|
||||
|
|
@ -3395,18 +3794,39 @@ static void destroy_actions(struct hist_trigger_data *hist_data)
|
|||
for (i = 0; i < hist_data->n_actions; i++) {
|
||||
struct action_data *data = hist_data->actions[i];
|
||||
|
||||
kfree(data);
|
||||
if (data->fn == action_trace)
|
||||
onmatch_destroy(data);
|
||||
else
|
||||
kfree(data);
|
||||
}
|
||||
}
|
||||
|
||||
static int parse_actions(struct hist_trigger_data *hist_data)
|
||||
{
|
||||
struct trace_array *tr = hist_data->event_file->tr;
|
||||
struct action_data *data;
|
||||
unsigned int i;
|
||||
int ret = 0;
|
||||
char *str;
|
||||
|
||||
for (i = 0; i < hist_data->attrs->n_actions; i++) {
|
||||
str = hist_data->attrs->action_str[i];
|
||||
|
||||
if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) {
|
||||
char *action_str = str + strlen("onmatch(");
|
||||
|
||||
data = onmatch_parse(tr, action_str);
|
||||
if (IS_ERR(data)) {
|
||||
ret = PTR_ERR(data);
|
||||
break;
|
||||
}
|
||||
data->fn = action_trace;
|
||||
} else {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
hist_data->actions[hist_data->n_actions++] = data;
|
||||
}
|
||||
|
||||
return ret;
|
||||
|
|
@ -3421,11 +3841,50 @@ static int create_actions(struct hist_trigger_data *hist_data,
|
|||
|
||||
for (i = 0; i < hist_data->attrs->n_actions; i++) {
|
||||
data = hist_data->actions[i];
|
||||
|
||||
if (data->fn == action_trace) {
|
||||
ret = onmatch_create(hist_data, file, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void print_onmatch_spec(struct seq_file *m,
|
||||
struct hist_trigger_data *hist_data,
|
||||
struct action_data *data)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,
|
||||
data->onmatch.match_event);
|
||||
|
||||
seq_printf(m, "%s(", data->onmatch.synth_event->name);
|
||||
|
||||
for (i = 0; i < data->n_params; i++) {
|
||||
if (i)
|
||||
seq_puts(m, ",");
|
||||
seq_printf(m, "%s", data->params[i]);
|
||||
}
|
||||
|
||||
seq_puts(m, ")");
|
||||
}
|
||||
|
||||
static void print_actions_spec(struct seq_file *m,
|
||||
struct hist_trigger_data *hist_data)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < hist_data->n_actions; i++) {
|
||||
struct action_data *data = hist_data->actions[i];
|
||||
|
||||
if (data->fn == action_trace)
|
||||
print_onmatch_spec(m, hist_data, data);
|
||||
}
|
||||
}
|
||||
|
||||
static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
|
||||
{
|
||||
unsigned int i;
|
||||
|
|
@ -3448,6 +3907,7 @@ static void destroy_hist_data(struct hist_trigger_data *hist_data)
|
|||
destroy_actions(hist_data);
|
||||
destroy_field_vars(hist_data);
|
||||
destroy_field_var_hists(hist_data);
|
||||
destroy_synth_var_refs(hist_data);
|
||||
|
||||
kfree(hist_data);
|
||||
}
|
||||
|
|
@ -4004,6 +4464,8 @@ static int event_hist_trigger_print(struct seq_file *m,
|
|||
}
|
||||
seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
|
||||
|
||||
print_actions_spec(m, hist_data);
|
||||
|
||||
if (data->filter_str)
|
||||
seq_printf(m, " if %s", data->filter_str);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue