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[Qemu-devel] [PATCH 1/2] trace: count number of enabled events
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 1/2] trace: count number of enabled events |
Date: |
Wed, 28 Oct 2015 07:06:26 +0100 |
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 <address@hidden>
---
trace/control-internal.h | 4 +++-
trace/control.c | 2 ++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/trace/control-internal.h b/trace/control-internal.h
index 5a8df28..271bddb 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -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;
}
diff --git a/trace/control.c b/trace/control.c
index 995beb3..95fbc07 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -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);
--
2.5.0