2bfe11c8fa
Every time a vCPU is hot-plugged, it will "inherit" its tracing state from the global state array. That is, if *any* existing vCPU has an event enabled, new vCPUs will have too. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-id: 147428970768.15111.7664565956870423529.stgit@fimbulvetr.bsc.es Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
284 lines
7.1 KiB
C
284 lines
7.1 KiB
C
/*
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* Interface for configuring and controlling the state of tracing events.
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*
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* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef TRACE__CONTROL_H
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#define TRACE__CONTROL_H
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#include "qemu-common.h"
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#include "trace/generated-events.h"
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/**
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* TraceEventID:
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*
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* Unique tracing event identifier.
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*
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* These are named as 'TRACE_${EVENT_NAME}'.
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*
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* See also: "trace/generated-events.h"
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*/
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enum TraceEventID;
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/**
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* trace_event_id:
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* @id: Event identifier.
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*
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* Get an event by its identifier.
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*
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* This routine has a constant cost, as opposed to trace_event_name and
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* trace_event_pattern.
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*
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* Pre-conditions: The identifier is valid.
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*
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* Returns: pointer to #TraceEvent.
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*
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*/
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static TraceEvent *trace_event_id(TraceEventID id);
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/**
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* trace_event_name:
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* @id: Event name.
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*
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* Search an event by its name.
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*
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* Returns: pointer to #TraceEvent or NULL if not found.
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*/
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TraceEvent *trace_event_name(const char *name);
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/**
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* trace_event_pattern:
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* @pat: Event name pattern.
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* @ev: Event to start searching from (not included).
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*
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* Get all events with a given name pattern.
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*
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* Returns: pointer to #TraceEvent or NULL if not found.
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*/
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TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev);
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/**
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* trace_event_is_pattern:
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*
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* Whether the given string is an event name pattern.
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*/
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static bool trace_event_is_pattern(const char *str);
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/**
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* trace_event_count:
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*
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* Return the number of events.
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*/
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static TraceEventID trace_event_count(void);
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/**
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* trace_event_get_id:
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*
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* Get the identifier of an event.
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*/
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static TraceEventID trace_event_get_id(TraceEvent *ev);
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/**
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* trace_event_get_vcpu_id:
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*
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* Get the per-vCPU identifier of an event.
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*
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* Special value #TRACE_VCPU_EVENT_COUNT means the event is not vCPU-specific
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* (does not have the "vcpu" property).
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*/
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static TraceEventVCPUID trace_event_get_vcpu_id(TraceEvent *ev);
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/**
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* trace_event_is_vcpu:
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*
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* Whether this is a per-vCPU event.
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*/
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static bool trace_event_is_vcpu(TraceEvent *ev);
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/**
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* trace_event_get_name:
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*
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* Get the name of an event.
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*/
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static const char * trace_event_get_name(TraceEvent *ev);
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/**
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* trace_event_get_state:
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* @id: Event identifier.
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*
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* Get the tracing state of an event (both static and dynamic).
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*
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* If the event has the disabled property, the check will have no performance
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* impact.
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*
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* As a down side, you must always use an immediate #TraceEventID value.
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*/
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#define trace_event_get_state(id) \
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((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
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/**
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* trace_event_get_vcpu_state:
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* @vcpu: Target vCPU.
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* @id: Event identifier (TraceEventID).
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* @vcpu_id: Per-vCPU event identifier (TraceEventVCPUID).
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*
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* Get the tracing state of an event (both static and dynamic) for the given
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* vCPU.
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*
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* If the event has the disabled property, the check will have no performance
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* impact.
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*
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* As a down side, you must always use an immediate #TraceEventID value.
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*/
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#define trace_event_get_vcpu_state(vcpu, id, vcpu_id) \
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((id ##_ENABLED) && trace_event_get_vcpu_state_dynamic_by_vcpu_id(vcpu, vcpu_id))
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/**
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* trace_event_get_state_static:
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* @id: Event identifier.
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*
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* Get the static tracing state of an event.
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*
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* Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
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* be set to 1 or 0 according to the presence of the disabled property).
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*/
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static bool trace_event_get_state_static(TraceEvent *ev);
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/**
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* trace_event_get_state_dynamic:
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*
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* Get the dynamic tracing state of an event.
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*
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* If the event has the 'vcpu' property, gets the OR'ed state of all vCPUs.
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*/
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static bool trace_event_get_state_dynamic(TraceEvent *ev);
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/**
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* trace_event_get_vcpu_state_dynamic:
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*
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* Get the dynamic tracing state of an event for the given vCPU.
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*/
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static bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu, TraceEvent *ev);
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/**
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* trace_event_set_state:
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*
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* Set the tracing state of an event (only if possible).
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*/
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#define trace_event_set_state(id, state) \
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do { \
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if ((id ##_ENABLED)) { \
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TraceEvent *_e = trace_event_id(id); \
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trace_event_set_state_dynamic(_e, state); \
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} \
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} while (0)
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/**
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* trace_event_set_vcpu_state:
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*
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* Set the tracing state of an event for the given vCPU (only if not disabled).
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*/
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#define trace_event_set_vcpu_state(vcpu, id, state) \
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do { \
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if ((id ##_ENABLED)) { \
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TraceEvent *_e = trace_event_id(id); \
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trace_event_set_vcpu_state_dynamic(vcpu, _e, state); \
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} \
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} while (0)
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/**
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* trace_event_set_state_dynamic:
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*
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* Set the dynamic tracing state of an event.
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*
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* If the event has the 'vcpu' property, sets the state on all vCPUs.
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*
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* Pre-condition: trace_event_get_state_static(ev) == true
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*/
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void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
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/**
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* trace_event_set_vcpu_state_dynamic:
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*
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* Set the dynamic tracing state of an event for the given vCPU.
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*
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* Pre-condition: trace_event_get_vcpu_state_static(ev) == true
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*/
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void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
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TraceEvent *ev, bool state);
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/**
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* trace_init_backends:
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* @file: Name of trace output file; may be NULL.
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* Corresponds to commandline option "-trace file=...".
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*
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* Initialize the tracing backend.
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*
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* Returns: Whether the backends could be successfully initialized.
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*/
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bool trace_init_backends(void);
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/**
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* trace_init_file:
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* @file: Name of trace output file; may be NULL.
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* Corresponds to commandline option "-trace file=...".
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*
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* Record the name of the output file for the tracing backend.
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* Exits if no selected backend does not support specifying the
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* output file, and a non-NULL file was passed.
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*/
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void trace_init_file(const char *file);
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/**
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* trace_init_vcpu:
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* @vcpu: Added vCPU.
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*
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* Set initial dynamic event state for a hot-plugged vCPU.
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*/
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void trace_init_vcpu(CPUState *vcpu);
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/**
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* trace_list_events:
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*
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* List all available events.
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*/
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void trace_list_events(void);
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/**
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* trace_enable_events:
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* @line_buf: A string with a glob pattern of events to be enabled or,
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* if the string starts with '-', disabled.
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*
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* Enable or disable matching events.
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*/
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void trace_enable_events(const char *line_buf);
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/**
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* Definition of QEMU options describing trace subsystem configuration
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*/
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extern QemuOptsList qemu_trace_opts;
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/**
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* trace_opt_parse:
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* @optarg: A string argument of --trace command line argument
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*
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* Initialize tracing subsystem.
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*
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* Returns the filename to save trace to. It must be freed with g_free().
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*/
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char *trace_opt_parse(const char *optarg);
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#include "trace/control-internal.h"
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#endif /* TRACE__CONTROL_H */
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