quorum: Avoid bdrv_aio_writev() for rewrites
[qemu.git] / trace / event-internal.h
1 /*
2 * Interface for configuring and controlling the state of tracing events.
3 *
4 * Copyright (C) 2012-2016 LluĂ­s 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 * Special value for TraceEvent.vcpu_id field to indicate
15 * that the event is not VCPU specific
16 */
17 #define TRACE_VCPU_EVENT_NONE ((uint32_t)-1)
18
19 /**
20 * TraceEvent:
21 * @id: Unique event identifier.
22 * @vcpu_id: Unique per-vCPU event identifier.
23 * @name: Event name.
24 * @sstate: Static tracing state.
25 * @dstate: Dynamic tracing state
26 *
27 * Interpretation of @dstate depends on whether the event has the 'vcpu'
28 * property:
29 * - false: Boolean value indicating whether the event is active.
30 * - true : Integral counting the number of vCPUs that have this event enabled.
31 *
32 * Opaque generic description of a tracing event.
33 */
34 typedef struct TraceEvent {
35 uint32_t id;
36 uint32_t vcpu_id;
37 const char * name;
38 const bool sstate;
39 uint16_t *dstate;
40 } TraceEvent;
41
42 void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
43
44 #endif /* TRACE__EVENT_INTERNAL_H */