perf: Prevent enabling of already enabled perf event

Currently, on every --enable perf_event command,
a new event->fd is created and counting of perf
event counter starts from zero and previous
event->fd is lost. This patch prevents this
behaviour.

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>

diff --git a/src/util/virperf.c b/src/util/virperf.c
index f64692bf39c49ec9edacbd40e8411ec3a898ebed..4493608a0f16e5e66119408905b5f50be8efb015 100644 (file)
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -198,6 +198,9 @@ virPerfEventEnable(virPerfPtr perf,
     if (!event || !event_attr)
         return -1;
 
+    if (event->enabled)
+        return 0;
+
     if (event_attr->attrType == 0 && (type == VIR_PERF_EVENT_CMT ||
                                        type == VIR_PERF_EVENT_MBMT ||
                                        type == VIR_PERF_EVENT_MBML)) {