qemu/stubs/trace-control.c
Daniel P. Berrange 9397740244 trace: remove global 'uint16 dstate[]' array
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>
2016-10-12 09:35:54 +02:00

52 lines
1.3 KiB
C

/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2014-2016 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.
*/
#include "qemu/osdep.h"
#include "trace/control.h"
void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
{
trace_event_set_state_dynamic(ev, state);
}
void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
bool state_pre;
assert(trace_event_get_state_static(ev));
/*
* We ignore the "vcpu" property here, since there's no target code. Then
* dstate can only be 1 or 0.
*/
state_pre = *(ev->dstate);
if (state_pre != state) {
if (state) {
trace_events_enabled_count++;
*(ev->dstate) = 1;
} else {
trace_events_enabled_count--;
*(ev->dstate) = 0;
}
}
}
void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
TraceEvent *ev, bool state)
{
/* should never be called on non-target binaries */
abort();
}
void trace_init_vcpu(CPUState *vcpu)
{
/* should never be called on non-target binaries */
abort();
}