trace/event-internal.h

   1 /*
   2  * Interface for configuring and controlling the state of tracing events.
   3  *
   4  * Copyright (C) 2012-2016 Lluís Vilanova <vilanova@ac.upc.edu>
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #ifndef TRACE__EVENT_INTERNAL_H
  11 #define TRACE__EVENT_INTERNAL_H
  12
  13 /**
  14  * TraceEvent:
  15  * @id: Unique event identifier.
  16  * @vcpu_id: Unique per-vCPU event identifier.
  17  * @name: Event name.
  18  * @sstate: Static tracing state.
  19  * @dstate: Dynamic tracing state
  20  *
  21  * Interpretation of @dstate depends on whether the event has the 'vcpu'
  22  *  property:
  23  * - false: Boolean value indicating whether the event is active.
  24  * - true : Integral counting the number of vCPUs that have this event enabled.
  25  *
  26  * Opaque generic description of a tracing event.
  27  */
  28 typedef struct TraceEvent {
  29     uint32_t id;
  30     uint32_t vcpu_id;
  31     const char * name;
  32     const bool sstate;
  33     uint16_t *dstate;
  34 } TraceEvent;
  35
  36 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
  37
  38 #endif /* TRACE__EVENT_INTERNAL_H */