Re: [Qemu-devel] [PATCH v4 6/6] trace: Add QAPI/QMP interfaces to query and control per-vCPU tracing state

["Lluís Vilanova" <vilanova@ac.upc.edu>]

Markus Armbruster writes:

> Lluís Vilanova <vilanova@ac.upc.edu> writes:
>> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
>> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
>> ---
>> monitor.c       |    4 +-
>> qapi/trace.json |   20 ++++++--
>> qmp-commands.hx |   17 ++++++-
>> trace/qmp.c     |  143 ++++++++++++++++++++++++++++++++++++++++++++-----------
>> 4 files changed, 147 insertions(+), 37 deletions(-)
>> 
>> diff --git a/monitor.c b/monitor.c
>> index a27e115..bb89877 100644
>> --- a/monitor.c
>> +++ b/monitor.c
>> @@ -910,7 +910,7 @@ static void hmp_trace_event(Monitor *mon, const QDict *qdict)
>> bool new_state = qdict_get_bool(qdict, "option");
>> Error *local_err = NULL;
>> 
>> -    qmp_trace_event_set_state(tp_name, new_state, true, true, &local_err);
>> +    qmp_trace_event_set_state(tp_name, new_state, true, true, false, 0, &local_err);
>> if (local_err) {
>> error_report_err(local_err);
>> }
>> @@ -1069,7 +1069,7 @@ static void hmp_info_cpustats(Monitor *mon, const QDict *qdict)
>> 
>> static void hmp_info_trace_events(Monitor *mon, const QDict *qdict)
>> {
>> -    TraceEventInfoList *events = qmp_trace_event_get_state("*", NULL);
>> +    TraceEventInfoList *events = qmp_trace_event_get_state("*", false, 0, NULL);
>> TraceEventInfoList *elem;
>> 
>> for (elem = events; elem != NULL; elem = elem->next) {

> The new feature remains inaccessible in HMP.  Any plans to extend HMP?
> Any reasons not to?

BTW, I was just looking at "info trace-events" and it only shows the state for
all events (there's no name pattern argument). Is it worth updating HMP knowing
it should be replaced in favour of the newer QAPI interface?


Thanks,
  Lluis