On Fri, 17 Jun 2016 17:28:47 -0400 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > On Tue, 24 May 2016 12:02:35 +0900 > Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > > On Mon, May 23, 2016 at 10:32:43PM -0400, Steven Rostedt wrote: > > > On Tue, 24 May 2016 11:16:31 +0900 > > > Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > > > > > > > > > Why not checking "hist" file then? > > > > > > I guess that could be done too, but is there anything wrong with my > > > current solution? Or is it just too hacky? How would one check if > > > something exists in a file or not? Say, I want to detect if > > > preemptirqsoff tracer exists or not, and that only happens if I do a > > > grep of current_tracer (I have tests coming that will need to do that)? > > > > There's nothing wrong with your approach IMHO. But I think checking > > existence of a file is clearer and consistent to other tests. > > > > For the preemptirqsoff tracer case, it seems there's no other way to > > check it simply. It's not hacky to me grep-ing contents to check > > availability of some option. > > > > Ah, due to traveling I never got around to finishing this. What about > this patch? > > From 7bf19b58ba02e66014efce6c051acba2c6cbd861 Mon Sep 17 00:00:00 2001 > From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx> > Date: Mon, 23 May 2016 15:06:30 -0400 > Subject: [PATCH] ftracetest: Fix hist unsupported result in hist selftests > > When histograms are not configured in the kernel, the ftracetest histogram > selftests should return "unsupported" and not "Failed". To detect this, the > test scripts have: > > FEATURE=`grep hist events/sched/sched_process_fork/trigger` > if [ -z "$FEATURE" ]; then > echo "hist trigger is not supported" > exit_unsupported > fi > > The problem is that '-e' is in effect and any error will cause the program > to terminate. The grep for 'hist' fails, because it is not compiled it (thus > unsupported), but because grep has an error code for failing to find the > string, it causes the program to terminate, and is marked as a failed test. > > Namhyung Kim recommended to test for the "hist" file located in > events/sched/sched_process_fork/hist instead, as it is more inline with the > other checks. As the hist file is only created if the histogram feature is > enabled, that is a valid check. Looks good to me :) Thanks Namhyung and Steve for fixing that! Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > > Link: http://lkml.kernel.org/r/20160523151538.4ea9ce0c@xxxxxxxxxxxxxxxxxx > > Suggested-by: Namhyung Kim <namhyung@xxxxxxxxxx> > Fixes: 76929ab51f0ee ("kselftests/ftrace: Add hist trigger testcases") > Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> > --- > .../testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc | 9 ++++----- > tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc | 9 ++++----- > .../testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc | 9 ++++----- > 3 files changed, 12 insertions(+), 15 deletions(-) > > diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc > index c2b61c4fda11..0bf5085281f3 100644 > --- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc > +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc > @@ -23,15 +23,14 @@ if [ ! -f events/sched/sched_process_fork/trigger ]; then > exit_unsupported > fi > > -reset_tracer > -do_reset > - > -FEATURE=`grep hist events/sched/sched_process_fork/trigger` > -if [ -z "$FEATURE" ]; then > +if [ ! -f events/sched/sched_process_fork/hist ]; then > echo "hist trigger is not supported" > exit_unsupported > fi > > +reset_tracer > +do_reset > + > echo "Test histogram with execname modifier" > > echo 'hist:keys=common_pid.execname' > events/sched/sched_process_fork/trigger > diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc > index b2902d42a537..a00184cd9c95 100644 > --- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc > +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc > @@ -23,15 +23,14 @@ if [ ! -f events/sched/sched_process_fork/trigger ]; then > exit_unsupported > fi > > -reset_tracer > -do_reset > - > -FEATURE=`grep hist events/sched/sched_process_fork/trigger` > -if [ -z "$FEATURE" ]; then > +if [ ! -f events/sched/sched_process_fork/hist ]; then > echo "hist trigger is not supported" > exit_unsupported > fi > > +reset_tracer > +do_reset > + > echo "Test histogram basic tigger" > > echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger > diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc > index 03c4a46561fc..3478b00ead57 100644 > --- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc > +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc > @@ -23,15 +23,14 @@ if [ ! -f events/sched/sched_process_fork/trigger ]; then > exit_unsupported > fi > > -reset_tracer > -do_reset > - > -FEATURE=`grep hist events/sched/sched_process_fork/trigger` > -if [ -z "$FEATURE" ]; then > +if [ ! -f events/sched/sched_process_fork/hist ]; then > echo "hist trigger is not supported" > exit_unsupported > fi > > +reset_tracer > +do_reset > + > reset_trigger > > echo "Test histogram multiple tiggers" > -- > 1.9.3 > -- Masami Hiramatsu <mhiramat@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
