Re: [PATCH 1/3] perf script: change process_event prototype

[David Ahern <daahern@cisco.com>]

On 03/02/2011 07:40 PM, Frederic Weisbecker wrote:
> On Wed, Mar 02, 2011 at 10:29:18AM -0700, David Ahern wrote:
>> Prepare for handling of samples for any event type.
>>
>> Signed-off-by: David Ahern <daahern@cisco.com>
>> ---
>>  tools/perf/builtin-script.c                        |   40 +++++++++++--------
>>  .../util/scripting-engines/trace-event-python.c    |   20 ++++++++-
> 
> What about Perl?

Oversight. Stumbled onto it yesterday afternoon. I have the perl module
installed now, so builds will get it too from now on.

> 
>>  tools/perf/util/trace-event-scripting.c            |    8 +--
>>  tools/perf/util/trace-event.h                      |    6 ++-
>>  4 files changed, 47 insertions(+), 27 deletions(-)
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index 5f40df6..0bee150 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -20,6 +20,27 @@ static u64			last_timestamp;
>>  static u64			nr_unordered;
>>  extern const struct option	record_options[];
>>  
>> +static void process_event(union perf_event *event,
>> +			  struct perf_sample *sample,
>> +			  struct perf_session *session)
>> +{
>> +	struct thread *thread = perf_session__findnew(session, event->ip.pid);
>> +
>> +	if (thread == NULL) {
>> +		pr_debug("problem processing %d event, skipping it.\n",
>> +			 event->header.type);
>> +		return;
>> +	}
> 
> Seems the thread is needed by any endpoints. It would be better to resolve
> it from process_sample_event and pass it to the process_event() handler.

tracepoints yes; S/W samples no. If you want it I'll add it.

> 
>> +
>> +	/*
>> +	 * FIXME: better resolve from pid from the struct trace_entry
>> +	 * field, although it should be the same than this perf
>> +	 * event pid
>> +	 */
>> +	print_event(sample->cpu, sample->raw_data, sample->raw_size,
>> +		    sample->time, thread->comm);
>> +}
> [...]
>> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
>> index 2040b85..5b03fb6 100644
>> --- a/tools/perf/util/scripting-engines/trace-event-python.c
>> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
>> @@ -204,9 +204,9 @@ static inline struct event *find_cache_event(int type)
>>  	return event;
>>  }
>>  
>> -static void python_process_event(int cpu, void *data,
>> -				 int size __unused,
>> -				 unsigned long long nsecs, char *comm)
>> +static void python_process_event(union perf_event *pevent,
>> +				struct perf_sample *sample,
>> +				struct perf_session *session)
>>  {
>>  	PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
>>  	static char handler_name[256];
>> @@ -218,6 +218,20 @@ static void python_process_event(int cpu, void *data,
>>  	int type;
>>  	int pid;
> 
> Please avoid such blank line in the middle of local vars declaration.

ok.

David

> 
>> +	int cpu = sample->cpu;
>> +	void *data = sample->raw_data;
>> +	unsigned long long nsecs = sample->time;
>> +	char *comm;
>> +	struct thread *thread;
>> +
>> +	thread = perf_session__findnew(session, pevent->ip.pid);
>> +	if (thread == NULL) {
>> +		pr_debug("problem processing %d event, skipping it.\n",
>> +			 pevent->header.type);
>> +		return;
>> +	}
>> +	comm = thread->comm;
>> +