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9397740244
Instead of having a global dstate array, declare a single
'uint16 TRACE_${EVENT_NAME}_DSTATE' variable for each
trace event. Record a pointer to this variable in the
TraceEvent struct too.
By turning trace_event_get_state_dynamic_by_id into a
macro, this still hits the fast path, and cache affinity
is ensured by declaring all the uint16 vars adjacent to
each other.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1475588159-30598-7-git-send-email-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
41 lines
1.1 KiB
C
41 lines
1.1 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) 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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#include "trace/generated-events.h"
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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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TraceEventID id;
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TraceEventVCPUID 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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