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authorPaolo Bonzini <pbonzini@redhat.com>2015-10-28 07:06:26 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2016-02-03 09:19:08 +0000
commit43b48cfc3e8ff745a10a6b78a55519d5cf7ec5e8 (patch)
tree659f921a14e9b8a6bfb03aac53b578cfc7fa7554 /trace
parentc65db7705b7926f4a084b93778e4bd5dd3990aad (diff)
downloadqemu-arm-43b48cfc3e8ff745a10a6b78a55519d5cf7ec5e8.tar.gz
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>
Diffstat (limited to 'trace')
-rw-r--r--trace/control-internal.h4
-rw-r--r--trace/control.c2
2 files changed, 5 insertions, 1 deletions
diff --git a/trace/control-internal.h b/trace/control-internal.h
index 5a8df28c58..271bddb19e 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 995beb384c..95fbc07c3c 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);