On Wed, 14 Nov 2018 14:18:06 -0600
Tom Zanussi <zanu...@kernel.org> wrote:
> From: Tom Zanussi <tom.zanu...@linux.intel.com>
>
> Add a test case verifying the basic functionality of the
> hist:snapshot() action.
>
> Signed-off-by: Tom Zanussi <tom.zanu...@linux.intel.com>
> ---
> .../inter-event/trigger-snapshot-action-hist.tc | 43
> ++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
> create mode 100644
> tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc
>
> diff --git
> a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc
>
> b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc
> new file mode 100644
> index 000000000000..a0a51e6a6a0c
> --- /dev/null
> +++
> b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc
> @@ -0,0 +1,43 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: event trigger - test inter-event histogram trigger snapshot
> action
> +
> +fail() { #msg
> + echo $1
> + exit_fail
> +}
> +
> +if [ ! -f set_event ]; then
> + echo "event tracing is not supported"
> + exit_unsupported
> +fi
> +
> +if [ ! -f snapshot ]; then
> + echo "snapshot is not supported"
> + exit_unsupported
> +fi
> +
> +grep -q "onchange(var)" README > /dev/null || exit_unsupported # version
> issue
> +
> +grep -q "snapshot()" README > /dev/null || exit_unsupported # version issue
"grep -q ... > /dev/null" is redundant, since -q doesn't show anything.
please drop "> /dev/null" redirection.
> +
> +echo "Test snapshot action"
> +
> +echo 1 > /sys/kernel/debug/tracing/events/sched/enable
> +
> +echo
> 'hist:keys=comm:newprio=prio:onchange($newprio).save(comm,prio):onchange($newprio).snapshot()
> if comm=="ping"' >>
> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger
This tests onchange().snapshot(), but document change only describes
onmax().snapshot().
Maybe we should improve document too.
> +
> +ping $LOCALHOST -c 3
> +nice -n 1 ping $LOCALHOST -c 3
> +
> +echo 0 > /sys/kernel/debug/tracing/events/sched/enable
Shouldn't we stop tracing instead of disabling the event?
Thank you,
> +
> +if ! grep -q "changed:" events/sched/sched_waking/hist; then
> + fail "Failed to create onchange action inter-event histogram"
> +fi
> +
> +if ! grep -q "comm=ping" snapshot; then
> + fail "Failed to create snapshot action inter-event histogram"
> +fi
> +
> +exit 0
> --
> 2.14.1
>
--
Masami Hiramatsu <mhira...@kernel.org>
