trace/control-internal.h

   1 /*
   2  * Interface for configuring and controlling the state of tracing events.
   3  *
   4  * Copyright (C) 2011-2016 Lluís Vilanova <[email protected]>
   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__CONTROL_INTERNAL_H
  11 #define TRACE__CONTROL_INTERNAL_H
  12
  13 extern TraceEvent trace_events[];
  14 extern bool trace_events_dstate[];
  15 extern int trace_events_enabled_count;
  16
  17
  18 static inline TraceEventID trace_event_count(void)
  19 {
  20     return TRACE_EVENT_COUNT;
  21 }
  22
  23 static inline TraceEvent *trace_event_id(TraceEventID id)
  24 {
  25     assert(id < trace_event_count());
  26     return &trace_events[id];
  27 }
  28
  29 static inline bool trace_event_is_pattern(const char *str)
  30 {
  31     assert(str != NULL);
  32     return strchr(str, '*') != NULL;
  33 }
  34
  35 static inline TraceEventID trace_event_get_id(TraceEvent *ev)
  36 {
  37     assert(ev != NULL);
  38     return ev->id;
  39 }
  40
  41 static inline TraceEventVCPUID trace_event_get_vcpu_id(TraceEvent *ev)
  42 {
  43     return ev->vcpu_id;
  44 }
  45
  46 static inline bool trace_event_is_vcpu(TraceEvent *ev)
  47 {
  48     return ev->vcpu_id != TRACE_VCPU_EVENT_COUNT;
  49 }
  50
  51 static inline const char * trace_event_get_name(TraceEvent *ev)
  52 {
  53     assert(ev != NULL);
  54     return ev->name;
  55 }
  56
  57 static inline bool trace_event_get_state_static(TraceEvent *ev)
  58 {
  59     assert(ev != NULL);
  60     return ev->sstate;
  61 }
  62
  63 static inline bool trace_event_get_state_dynamic_by_id(TraceEventID id)
  64 {
  65     /* it's on fast path, avoid consistency checks (asserts) */
  66     return unlikely(trace_events_enabled_count) && trace_events_dstate[id];
  67 }
  68
  69 static inline bool trace_event_get_state_dynamic(TraceEvent *ev)
  70 {
  71     TraceEventID id;
  72     assert(trace_event_get_state_static(ev));
  73     id = trace_event_get_id(ev);
  74     return trace_event_get_state_dynamic_by_id(id);
  75 }
  76
  77 static inline void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
  78 {
  79     int id = trace_event_get_id(ev);
  80     assert(ev != NULL);
  81     assert(trace_event_get_state_static(ev));
  82     trace_events_enabled_count += state - trace_events_dstate[id];
  83     trace_events_dstate[id] = state;
  84 }
  85
  86 #endif /* TRACE__CONTROL_INTERNAL_H */