Document wildcards for userspace tracer

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/lttng/commands/enable_events.c b/lttng/commands/enable_events.c
index e435e1f7858f0d15133a31d5ad8004fbd359925b..7df849e73b88d9593575a68fe59d2722283e1aaa 100644 (file)
--- a/lttng/commands/enable_events.c
+++ b/lttng/commands/enable_events.c
@@ -100,6 +100,11 @@ static void usage(FILE *ofp)
        fprintf(ofp, "\n");
        fprintf(ofp, "Event options:\n");
        fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
+       fprintf(ofp, "                           - userspace tracer supports wildcards at end of string.\n");
+       fprintf(ofp, "                             Don't forget to quote to deal with bash expansion.\n");
+       fprintf(ofp, "                             e.g.:\n");
+       fprintf(ofp, "                               \"*\"\n");
+       fprintf(ofp, "                               \"app_component:na*\"\n");
        fprintf(ofp, "    --loglevel             Tracepoint loglevel\n");
        fprintf(ofp, "    --probe [addr | symbol | symbol+offset]\n");
        fprintf(ofp, "                           Dynamic probe.\n");