[PATCH v8 08/37] tracing: Give event triggers access to ring_buffer_event

Tom Zanussi
2017-12-21T16:13:48Z

The ring_buffer event can provide a timestamp that may be useful to
various triggers - pass it into the handlers for that purpose.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
---
include/linux/trace_events.h | 14 ++++++-----
kernel/trace/trace.h | 9 +++----
kernel/trace/trace_events_hist.c | 11 +++++----
kernel/trace/trace_events_trigger.c | 47 +++++++++++++++++++++++--------------
4 files changed, 49 insertions(+), 32 deletions(-)

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index af44e7c..7ebc431 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -430,11 +430,13 @@ enum event_trigger_type {

extern int filter_match_preds(struct event_filter *filter, void *rec);

-extern enum event_trigger_type event_triggers_call(struct trace_event_file *file,
- void *rec);
-extern void event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt,
- void *rec);
+extern enum event_trigger_type
+event_triggers_call(struct trace_event_file *file, void *rec,
+ struct ring_buffer_event *event);
+extern void
+event_triggers_post_call(struct trace_event_file *file,
+ enum event_trigger_type tt,
+ void *rec, struct ring_buffer_event *event);

bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);

@@ -454,7 +456,7 @@ extern void event_triggers_post_call(struct trace_event_file *file,

if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
- event_triggers_call(file, NULL);
+ event_triggers_call(file, NULL, NULL);
if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
return true;
if (eflags & EVENT_FILE_FL_PID_FILTER)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4773417..99060f7 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1294,7 +1294,7 @@ static inline void trace_buffer_unlock_commit(struct trace_array *tr,
unsigned long eflags = file->flags;

if (eflags & EVENT_FILE_FL_TRIGGER_COND)
- *tt = event_triggers_call(file, entry);
+ *tt = event_triggers_call(file, entry, event);

if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
(unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
@@ -1331,7 +1331,7 @@ static inline void trace_buffer_unlock_commit(struct trace_array *tr,
trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);

if (tt)
- event_triggers_post_call(file, tt, entry);
+ event_triggers_post_call(file, tt, entry, event);
}

/**
@@ -1364,7 +1364,7 @@ static inline void trace_buffer_unlock_commit(struct trace_array *tr,
irq_flags, pc, regs);

if (tt)
- event_triggers_post_call(file, tt, entry);
+ event_triggers_post_call(file, tt, entry, event);
}

#define FILTER_PRED_INVALID ((unsigned short)-1)
@@ -1589,7 +1589,8 @@ extern void set_named_trigger_data(struct event_trigger_data *data,
*/
struct event_trigger_ops {
void (*func)(struct event_trigger_data *data,
- void *rec);
+ void *rec,
+ struct ring_buffer_event *rbe);
int (*init)(struct event_trigger_ops *ops,
struct event_trigger_data *data);
void (*free)(struct event_trigger_ops *ops,
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 712260e..63a1912 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -909,7 +909,8 @@ static inline void add_to_key(char *compound_key, void *key,
memcpy(compound_key + key_field->offset, key, size);
}

-static void event_hist_trigger(struct event_trigger_data *data, void *rec)
+static void event_hist_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
struct hist_trigger_data *hist_data = data->private_data;
bool use_compound_key = (hist_data->n_keys > 1);
@@ -1658,7 +1659,8 @@ __init int register_trigger_hist_cmd(void)
}

static void
-hist_enable_trigger(struct event_trigger_data *data, void *rec)
+hist_enable_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
struct enable_trigger_data *enable_data = data->private_data;
struct event_trigger_data *test;
@@ -1674,7 +1676,8 @@ __init int register_trigger_hist_cmd(void)
}

static void
-hist_enable_count_trigger(struct event_trigger_data *data, void *rec)
+hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (!data->count)
return;
@@ -1682,7 +1685,7 @@ __init int register_trigger_hist_cmd(void)
if (data->count != -1)
(data->count)--;

- hist_enable_trigger(data, rec);
+ hist_enable_trigger(data, rec, event);
}

static struct event_trigger_ops hist_enable_trigger_ops = {
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index f2ac9d4..9b0fe31 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -63,7 +63,8 @@ void trigger_data_free(struct event_trigger_data *data)
* any trigger that should be deferred, ETT_NONE if nothing to defer.
*/
enum event_trigger_type
-event_triggers_call(struct trace_event_file *file, void *rec)
+event_triggers_call(struct trace_event_file *file, void *rec,
+ struct ring_buffer_event *event)
{
struct event_trigger_data *data;
enum event_trigger_type tt = ETT_NONE;
@@ -76,7 +77,7 @@ enum event_trigger_type
if (data->paused)
continue;
if (!rec) {
- data->ops->func(data, rec);
+ data->ops->func(data, rec, event);
continue;
}
filter = rcu_dereference_sched(data->filter);
@@ -86,7 +87,7 @@ enum event_trigger_type
tt |= data->cmd_ops->trigger_type;
continue;
}
- data->ops->func(data, rec);
+ data->ops->func(data, rec, event);
}
return tt;
}
@@ -108,7 +109,7 @@ enum event_trigger_type
void
event_triggers_post_call(struct trace_event_file *file,
enum event_trigger_type tt,
- void *rec)
+ void *rec, struct ring_buffer_event *event)
{
struct event_trigger_data *data;

@@ -116,7 +117,7 @@ enum event_trigger_type
if (data->paused)
continue;
if (data->cmd_ops->trigger_type & tt)
- data->ops->func(data, rec);
+ data->ops->func(data, rec, event);
}
}
EXPORT_SYMBOL_GPL(event_triggers_post_call);
@@ -909,7 +910,8 @@ void set_named_trigger_data(struct event_trigger_data *data,
}

static void
-traceon_trigger(struct event_trigger_data *data, void *rec)
+traceon_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (tracing_is_on())
return;
@@ -918,7 +920,8 @@ void set_named_trigger_data(struct event_trigger_data *data,
}

static void
-traceon_count_trigger(struct event_trigger_data *data, void *rec)
+traceon_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (tracing_is_on())
return;
@@ -933,7 +936,8 @@ void set_named_trigger_data(struct event_trigger_data *data,
}

static void
-traceoff_trigger(struct event_trigger_data *data, void *rec)
+traceoff_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (!tracing_is_on())
return;
@@ -942,7 +946,8 @@ void set_named_trigger_data(struct event_trigger_data *data,
}

static void
-traceoff_count_trigger(struct event_trigger_data *data, void *rec)
+traceoff_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (!tracing_is_on())
return;
@@ -1039,13 +1044,15 @@ void set_named_trigger_data(struct event_trigger_data *data,

#ifdef CONFIG_TRACER_SNAPSHOT
static void
-snapshot_trigger(struct event_trigger_data *data, void *rec)
+snapshot_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
tracing_snapshot();
}

static void
-snapshot_count_trigger(struct event_trigger_data *data, void *rec)
+snapshot_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (!data->count)
return;
@@ -1053,7 +1060,7 @@ void set_named_trigger_data(struct event_trigger_data *data,
if (data->count != -1)
(data->count)--;

- snapshot_trigger(data, rec);
+ snapshot_trigger(data, rec, event);
}

static int
@@ -1132,13 +1139,15 @@ static __init int register_trigger_snapshot_cmd(void)
#define STACK_SKIP 3

static void
-stacktrace_trigger(struct event_trigger_data *data, void *rec)
+stacktrace_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
trace_dump_stack(STACK_SKIP);
}

static void
-stacktrace_count_trigger(struct event_trigger_data *data, void *rec)
+stacktrace_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
if (!data->count)
return;
@@ -1146,7 +1155,7 @@ static __init int register_trigger_snapshot_cmd(void)
if (data->count != -1)
(data->count)--;

- stacktrace_trigger(data, rec);
+ stacktrace_trigger(data, rec, event);
}

static int
@@ -1208,7 +1217,8 @@ static __init void unregister_trigger_traceon_traceoff_cmds(void)
}

static void
-event_enable_trigger(struct event_trigger_data *data, void *rec)
+event_enable_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
struct enable_trigger_data *enable_data = data->private_data;

@@ -1219,7 +1229,8 @@ static __init void unregister_trigger_traceon_traceoff_cmds(void)
}

static void
-event_enable_count_trigger(struct event_trigger_data *data, void *rec)
+event_enable_count_trigger(struct event_trigger_data *data, void *rec,
+ struct ring_buffer_event *event)
{
struct enable_trigger_data *enable_data = data->private_data;

@@ -1233,7 +1244,7 @@ static __init void unregister_trigger_traceon_traceoff_cmds(void)
if (data->count != -1)
(data->count)--;

- event_enable_trigger(data, rec);
+ event_enable_trigger(data, rec, event);
}

int event_enable_trigger_print(struct seq_file *m,
--
1.9.3