diff mbox

[PULL,01/13] trace: count number of enabled events

Message ID 1454514465-11856-2-git-send-email-stefanha@redhat.com
State New
Headers show

Commit Message

Stefan Hajnoczi Feb. 3, 2016, 3:47 p.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

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>
---
 trace/control-internal.h | 4 +++-
 trace/control.c          | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)
diff mbox

Patch

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);