14101d028d
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-id: 20140825112002.31112.60143.stgit@fimbulvetr.bsc.es Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
/*
|
|
* Interface for configuring and controlling the state of tracing events.
|
|
*
|
|
* Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef TRACE__CONTROL_H
|
|
#define TRACE__CONTROL_H
|
|
|
|
#include "qemu-common.h"
|
|
#include "trace/generated-events.h"
|
|
|
|
|
|
/**
|
|
* TraceEventID:
|
|
*
|
|
* Unique tracing event identifier.
|
|
*
|
|
* These are named as 'TRACE_${EVENT_NAME}'.
|
|
*
|
|
* See also: "trace/generated-events.h"
|
|
*/
|
|
enum TraceEventID;
|
|
|
|
/**
|
|
* trace_event_id:
|
|
* @id: Event identifier.
|
|
*
|
|
* Get an event by its identifier.
|
|
*
|
|
* This routine has a constant cost, as opposed to trace_event_name and
|
|
* trace_event_pattern.
|
|
*
|
|
* Pre-conditions: The identifier is valid.
|
|
*
|
|
* Returns: pointer to #TraceEvent.
|
|
*
|
|
*/
|
|
static TraceEvent *trace_event_id(TraceEventID id);
|
|
|
|
/**
|
|
* trace_event_name:
|
|
* @id: Event name.
|
|
*
|
|
* Search an event by its name.
|
|
*
|
|
* Returns: pointer to #TraceEvent or NULL if not found.
|
|
*/
|
|
TraceEvent *trace_event_name(const char *name);
|
|
|
|
/**
|
|
* trace_event_pattern:
|
|
* @pat: Event name pattern.
|
|
* @ev: Event to start searching from (not included).
|
|
*
|
|
* Get all events with a given name pattern.
|
|
*
|
|
* Returns: pointer to #TraceEvent or NULL if not found.
|
|
*/
|
|
TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev);
|
|
|
|
/**
|
|
* trace_event_is_pattern:
|
|
*
|
|
* Whether the given string is an event name pattern.
|
|
*/
|
|
static bool trace_event_is_pattern(const char *str);
|
|
|
|
/**
|
|
* trace_event_count:
|
|
*
|
|
* Return the number of events.
|
|
*/
|
|
static TraceEventID trace_event_count(void);
|
|
|
|
|
|
|
|
/**
|
|
* trace_event_get_id:
|
|
*
|
|
* Get the identifier of an event.
|
|
*/
|
|
static TraceEventID trace_event_get_id(TraceEvent *ev);
|
|
|
|
/**
|
|
* trace_event_get_name:
|
|
*
|
|
* Get the name of an event.
|
|
*/
|
|
static const char * trace_event_get_name(TraceEvent *ev);
|
|
|
|
/**
|
|
* trace_event_get_state:
|
|
* @id: Event identifier.
|
|
*
|
|
* Get the tracing state of an event (both static and dynamic).
|
|
*
|
|
* If the event has the disabled property, the check will have no performance
|
|
* impact.
|
|
*
|
|
* As a down side, you must always use an immediate #TraceEventID value.
|
|
*/
|
|
#define trace_event_get_state(id) \
|
|
((id ##_ENABLED) && trace_event_get_state_dynamic(trace_event_id(id)))
|
|
|
|
/**
|
|
* trace_event_get_state_static:
|
|
* @id: Event identifier.
|
|
*
|
|
* Get the static tracing state of an event.
|
|
*
|
|
* Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
|
|
* be set to 1 or 0 according to the presence of the disabled property).
|
|
*/
|
|
static bool trace_event_get_state_static(TraceEvent *ev);
|
|
|
|
/**
|
|
* trace_event_get_state_dynamic:
|
|
*
|
|
* Get the dynamic tracing state of an event.
|
|
*/
|
|
static bool trace_event_get_state_dynamic(TraceEvent *ev);
|
|
|
|
/**
|
|
* trace_event_set_state:
|
|
*
|
|
* Set the tracing state of an event (only if possible).
|
|
*/
|
|
#define trace_event_set_state(id, state) \
|
|
do { \
|
|
if ((id ##_ENABLED)) { \
|
|
TraceEvent *_e = trace_event_id(id); \
|
|
trace_event_set_state_dynamic(_e, state); \
|
|
} \
|
|
} while (0)
|
|
|
|
/**
|
|
* trace_event_set_state_dynamic:
|
|
*
|
|
* Set the dynamic tracing state of an event.
|
|
*
|
|
* Pre-condition: trace_event_get_state_static(ev) == true
|
|
*/
|
|
static void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
|
|
|
|
|
|
|
|
/**
|
|
* trace_init_backends:
|
|
* @events: Name of file with events to be enabled at startup; may be NULL.
|
|
* Corresponds to commandline option "-trace events=...".
|
|
* @file: Name of trace output file; may be NULL.
|
|
* Corresponds to commandline option "-trace file=...".
|
|
*
|
|
* Initialize the tracing backend.
|
|
*
|
|
* Returns: Whether the backends could be successfully initialized.
|
|
*/
|
|
bool trace_init_backends(const char *events, const char *file);
|
|
|
|
|
|
#include "trace/control-internal.h"
|
|
|
|
#endif /* TRACE__CONTROL_H */
|