On Fri, 24 Aug 2018 19:18:36 -0400 Steven Rostedt <[email protected]> wrote:
> On Fri, 17 Aug 2018 01:39:34 +0900 > Masami Hiramatsu <[email protected]> wrote: > > > Add a testcase for changing ringbuffer size. This tests > > not only ringbuffer size but also tests the imbalance > > per-cpu buffer size change too. > > > > Signed-off-by: Masami Hiramatsu <[email protected]> > > I'm fine with this, but one day I need to port over some of my other > tests. I have a test that stresses the ring buffer size (basically > checks to see if it can cause an oom). I need to port that to > selftests. But for now... Hmm, such stress test is not good for kselftest, since it can cause oom and kill some test process. Maybe we should have such stresstest framework (which allows test to crash kernel) > > Acked-by: Steven Rostedt (VMware) <[email protected]> > > But, one more thing.. > > > --- > > .../ftrace/test.d/00basic/ringbuffer_size.tc | 21 > > ++++++++++++++++++++ > > 1 file changed, 21 insertions(+) > > create mode 100644 > > tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc > > > > diff --git > > a/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc > > b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc > > new file mode 100644 > > index 000000000000..9224f33b3194 > > --- /dev/null > > +++ b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc > > @@ -0,0 +1,21 @@ > > +#!/bin/sh > > +# SPDX-License-Identifier: GPL-2.0 > > +# description: Change the ringbuffer size > > Should add: > > # flags: instance OK, I'll add it. Thank you! > > As this works for instances as well. > > -- Steve > > > + > > +rb_size_test() { > > +ORIG=`cat buffer_size_kb` > > + > > +expr $ORIG / 2 > buffer_size_kb > > + > > +expr $ORIG \* 2 > buffer_size_kb > > + > > +echo $ORIG > buffer_size_kb > > +} > > + > > +rb_size_test > > + > > +: "If per-cpu buffer is supported, imbalance it" > > +if [ -d per_cpu/cpu0 ]; then > > + cd per_cpu/cpu0 > > + rb_size_test > > +fi > -- Masami Hiramatsu <[email protected]>
