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trace: remove global 'uint16 dstate[]' array

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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>
This commit is contained in:
Daniel P. Berrange 2016-10-04 14:35:45 +01:00 • committed by Stefan Hajnoczi
parent 599ab2f241
commit 9397740244
8 changed files with 37 additions and 39 deletions
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7
trace/event-internal.h
View file

@ -19,6 +19,12 @@
* @vcpu_id: Unique per-vCPU event identifier.
* @name: Event name.
* @sstate: Static tracing state.
* @dstate: Dynamic tracing state
*
* Interpretation of @dstate depends on whether the event has the 'vcpu'
* property:
* - false: Boolean value indicating whether the event is active.
* - true : Integral counting the number of vCPUs that have this event enabled.
*
* Opaque generic description of a tracing event.
*/
@ -27,6 +33,7 @@ typedef struct TraceEvent {
TraceEventVCPUID vcpu_id;
const char * name;
const bool sstate;
uint16_t *dstate;
} TraceEvent;
void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state);