On Fri, 17 Aug 2018 01:39:34 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> 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 <mhiramat@xxxxxxxxxx>
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...
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
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
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
