linux-kernel - Re: [PATCH 2/2] kselftests/ftrace: Add a test case for event pid filtering

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Date:	Tue, 10 May 2016 09:24:40 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/2] kselftests/ftrace: Add a test case for event pid
 filtering

On 05/10/2016 08:53 AM, Namhyung Kim wrote:
> Check event is filtered by set_event_pid and options/event-fork.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Looks good to me. Steve! Ack if you are good with this patch.
I can get this into 4.8-rc1

thanks,
-- Shuah

> ---
>  .../selftests/ftrace/test.d/event/event-pid.tc     | 72 ++++++++++++++++++++++
>  1 file changed, 72 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/event/event-pid.tc b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> new file mode 100644
> index 000000000000..d4ab27b522f8
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
> @@ -0,0 +1,72 @@
> +#!/bin/sh
> +# description: event tracing - restricts events based on pid
> +
> +do_reset() {
> +    echo > set_event
> +    echo > set_event_pid
> +    echo 0 > options/event-fork
> +    clear_trace
> +}
> +
> +fail() { #msg
> +    do_reset
> +    echo $1
> +    exit $FAIL
> +}
> +
> +yield() {
> +    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
> +}
> +
> +if [ ! -f set_event -o ! -d events/sched ]; then
> +    echo "event tracing is not supported"
> +    exit_unsupported
> +fi
> +
> +if [ ! -f set_event_pid ]; then
> +    echo "event pid filtering is not supported"
> +    exit_unsupported
> +fi
> +
> +reset_tracer
> +do_reset
> +
> +echo 1 > events/sched/sched_switch/enable
> +
> +yield
> +
> +count=`cat trace | grep sched_switch | wc -l`
> +if [ $count -eq 0 ]; then
> +    fail "sched_switch events are not recorded"
> +fi
> +
> +do_reset
> +
> +read mypid rest < /proc/self/stat
> +
> +echo $mypid > set_event_pid
> +echo 'sched:sched_switch' > set_event
> +
> +yield
> +
> +count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
> +if [ $count -ne 0 ]; then
> +    fail "sched_switch events from other task are recorded"
> +fi
> +
> +do_reset
> +
> +echo $mypid > set_event_pid
> +echo 1 > options/event-fork
> +echo 1 > events/sched/sched_switch/enable
> +
> +yield
> +
> +count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
> +if [ $count -eq 0 ]; then
> +    fail "sched_switch events from other task are not recorded"
> +fi
> +
> +do_reset
> +
> +exit 0
>