Re: [Qemu-devel] [RFC PATCH 06/21] trace: show trace point counts in the monitor

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Alex Bennée (alex.bennee@linaro.org) wrote:
> Now we have counts for each trace point we can expose them in the
> monitor when the user queries what trace points are available.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  monitor.c       | 5 +++--
>  qapi/trace.json | 3 ++-
>  trace/qmp.c     | 1 +
>  3 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/monitor.c b/monitor.c
> index c4677b502b..d8229cd2b0 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1421,9 +1421,10 @@ static void hmp_info_trace_events(Monitor *mon, const QDict *qdict)
>      }
>  
>      for (elem = events; elem != NULL; elem = elem->next) {
> -        monitor_printf(mon, "%s : state %u\n",
> +        monitor_printf(mon, "%s : state %u count %" PRIu64 "\n",
>                         elem->value->name,
> -                       elem->value->state == TRACE_EVENT_STATE_ENABLED ? 1 : 0);
> +                       elem->value->state == TRACE_EVENT_STATE_ENABLED ? 1 : 0,
> +                       elem->value->count);
>      }
>      qapi_free_TraceEventInfoList(events);
>  }
> diff --git a/qapi/trace.json b/qapi/trace.json
> index 799b254a18..b9184b0d18 100644
> --- a/qapi/trace.json
> +++ b/qapi/trace.json
> @@ -33,6 +33,7 @@
>  # @name: Event name.
>  # @state: Tracing state.
>  # @vcpu: Whether this is a per-vCPU event (since 2.7).
> +# @count: Current hits on trace-point (since 3.1).
>  #
>  # An event is per-vCPU if it has the "vcpu" property in the "trace-events"
>  # files.
> @@ -40,7 +41,7 @@
>  # Since: 2.2
>  ##
>  { 'struct': 'TraceEventInfo',
> -  'data': {'name': 'str', 'state': 'TraceEventState', 'vcpu': 'bool'} }
> +  'data': {'name': 'str', 'state': 'TraceEventState', 'vcpu': 'bool', 'count': 'int' } }
>  
>  ##
>  # @trace-event-get-state:
> diff --git a/trace/qmp.c b/trace/qmp.c
> index ea99b00956..cce8198091 100644
> --- a/trace/qmp.c
> +++ b/trace/qmp.c
> @@ -102,6 +102,7 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
>          elem->value = g_new(TraceEventInfo, 1);
>          elem->value->vcpu = is_vcpu;
>          elem->value->name = g_strdup(trace_event_get_name(ev));
> +        elem->value->count = ev->count;
>  
>          if (!trace_event_get_state_static(ev)) {
>              elem->value->state = TRACE_EVENT_STATE_UNAVAILABLE;
> -- 
> 2.17.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK