perf probe: Fix usage when libtraceevent is missing

[linux-2.6-microblaze.git] / tools / perf / builtin-probe.c

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index ed73d0b..e72f6ce 100644 (file)
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -383,9 +383,18 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
 
        /* Note that it is possible to skip all events because of blacklist */
        if (event) {
+#ifndef HAVE_LIBTRACEEVENT
+               pr_info("\nperf is not linked with libtraceevent, to use the new probe you can use tracefs:\n\n");
+               pr_info("\tcd /sys/kernel/tracing/\n");
+               pr_info("\techo 1 > events/%s/%s/enable\n", group, event);
+               pr_info("\techo 1 > tracing_on\n");
+               pr_info("\tcat trace_pipe\n");
+               pr_info("\tBefore removing the probe, echo 0 > events/%s/%s/enable\n", group, event);
+#else
                /* Show how to use the event. */
                pr_info("\nYou can now use it in all perf tools, such as:\n\n");
                pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
+#endif
        }
 
 out_cleanup: