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trace: count number of enabled events 

This lets trace_event_get_state_dynamic quickly return false.  Right
now there is hardly any benefit because there are also many assertions
and indirections, but the next patch will streamline all of this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-10-28 07:06:26 +01:00 committed by Stefan Hajnoczi
parent c65db7705b
commit 43b48cfc3e
2 changed files with 5 additions and 1 deletions
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4
trace/control-internal.h
View File

@ -14,6 +14,7 @@
extern TraceEvent trace_events[];
extern int trace_events_enabled_count;
static inline TraceEventID trace_event_count(void)
@ -54,13 +55,14 @@ static inline bool trace_event_get_state_static(TraceEvent *ev)
static inline bool trace_event_get_state_dynamic(TraceEvent *ev)
{
assert(ev != NULL);
return ev->dstate;
return unlikely(trace_events_enabled_count) && ev->dstate;
}
static inline void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
{
assert(ev != NULL);
assert(trace_event_get_state_static(ev));
trace_events_enabled_count += state - ev->dstate;
ev->dstate = state;
}

2
trace/control.c
View File

@ -16,6 +16,8 @@
#endif
#include "qemu/error-report.h"
int trace_events_enabled_count;
TraceEvent *trace_event_name(const char *name)
{
assert(name != NULL);