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The TraceEventID and TraceEventVCPUID enums constants are no longer actually used for anything critical. The TRACE_EVENT_COUNT limit is used to determine the size of the TraceEvents array, and can be removed if we just NULL terminate the array instead. The TRACE_VCPU_EVENT_COUNT limit is used as a magic value for marking non-vCPU events, and also for declaring the size of the trace dstate mask in the CPUState struct. The former usage can be replaced by a dedicated constant TRACE_EVENT_VCPU_NONE, defined as (uint32_t)-1. For the latter usage, we can simply define a constant for the number of VCPUs, avoiding the need for the full enum. The only other usages of the enum values can be replaced by accesing the id/vcpu_id fields via the named TraceEvent structs. Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 1475588159-30598-11-git-send-email-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
45 lines
1.2 KiB
C
45 lines
1.2 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) 2012-2016 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__EVENT_INTERNAL_H
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#define TRACE__EVENT_INTERNAL_H
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/*
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* Special value for TraceEvent.vcpu_id field to indicate
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* that the event is not VCPU specific
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*/
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#define TRACE_VCPU_EVENT_NONE ((uint32_t)-1)
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/**
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* TraceEvent:
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* @id: Unique event identifier.
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* @vcpu_id: Unique per-vCPU event identifier.
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* @name: Event name.
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* @sstate: Static tracing state.
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* @dstate: Dynamic tracing state
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*
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* Interpretation of @dstate depends on whether the event has the 'vcpu'
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* property:
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* - false: Boolean value indicating whether the event is active.
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* - true : Integral counting the number of vCPUs that have this event enabled.
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*
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* Opaque generic description of a tracing event.
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*/
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typedef struct TraceEvent {
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uint32_t id;
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uint32_t vcpu_id;
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const char * name;
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const bool sstate;
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uint16_t *dstate;
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} TraceEvent;
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void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);
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#endif /* TRACE__EVENT_INTERNAL_H */
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