Fix: add missing UST perf counter support check

Report whether performance counters are supported by UST on the
architecture as soon as the user try to enable a perf counter context.

Fixes #851

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 999f0dfc21e75f4e988476be894adcff3e33f4bc..5f41bd764308a812806f623bdfb2ed24c09b838d 100644 (file)
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -474,7 +474,12 @@ int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type)
                utype = LTTNG_UST_CONTEXT_IP;
                break;
        case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
-               utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
+               if (!ustctl_has_perf_counters()) {
+                       utype = -1;
+                       WARN("Perf counters not implemented in UST");
+               } else {
+                       utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
+               }
                break;
        default:
                ERR("Invalid UST context");