Currently there's no error message prompted if we failed to start
workload. And we still get some trace which is confusing. Let's tell
users what happened.
Committer testing:
Before:
# perf ftrace nonsense |& head
5) | switch_mm_irqs_off() {
5) 0.400 us | load_new_mm_cr3();
5) 3.261 us | }
------------------------------------------
5) <idle>-0 => <...>-3494
------------------------------------------
5) | finish_task_switch() {
5) ==========> |
5) | smp_irq_work_interrupt() {
# type nonsense
-bash: type: nonsense: not found
#
After:
# perf ftrace nonsense |& head
workload failed: No such file or directory
# type nonsense
-bash: type: nonsense: not found
#
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/20200510150628.16610-3-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
51a09d8f9a