linux-kernel - Re: [PATCH 2/3] perf test: Cleanup daemon if test is interrupted.

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Date:   Thu, 11 Mar 2021 11:37:52 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf test: Cleanup daemon if test is interrupted.

On Wed, Mar 10, 2021 at 12:41:17PM -0800, Ian Rogers wrote:
> Reorder daemon_start and daemon_exit as the trap handler is added in
> daemon_start referencing daemon_exit.

makes sense, minor comments below

> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/shell/daemon.sh | 34 +++++++++++++++++++-------------
>  1 file changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/perf/tests/shell/daemon.sh b/tools/perf/tests/shell/daemon.sh
> index 66ad56b4e0a5..a02cedc76de6 100755
> --- a/tools/perf/tests/shell/daemon.sh
> +++ b/tools/perf/tests/shell/daemon.sh
> @@ -98,6 +98,23 @@ check_line_other()
>  	fi
>  }
>  
> +daemon_exit()
> +{
> +	local config=$1
> +
> +	local line=`perf daemon --config ${config} -x: | head -1`
> +	local pid=`echo "${line}" | awk 'BEGIN { FS = ":" } ; { print $1 }'`
> +
> +        # Reset trap handler.
> +        trap - SIGINT SIGTERM

please keep the 'tabs' in here

> +
> +	# stop daemon
> +	perf daemon stop --config ${config}
> +
> +	# ... and wait for the pid to go away
> +	tail --pid=${pid} -f /dev/null
> +}
> +
>  daemon_start()
>  {
>  	local config=$1
> @@ -105,6 +122,9 @@ daemon_start()
>  
>  	perf daemon start --config ${config}
>  
> +        # Clean up daemon if interrupted.
> +        trap "daemon_exit ${config}; exit 4" SIGINT SIGTERM

ditto, plus let's document exit values somewhere in comments,
I think the next patch is adding exit 62, so that one as well

thanks,
jirka

> +
>  	# wait for the session to ping
>  	local state="FAIL"
>  	while [ "${state}" != "OK" ]; do
> @@ -113,20 +133,6 @@ daemon_start()
>  	done
>  }
>  
> -daemon_exit()
> -{
> -	local config=$1
> -
> -	local line=`perf daemon --config ${config} -x: | head -1`
> -	local pid=`echo "${line}" | awk 'BEGIN { FS = ":" } ; { print $1 }'`
> -
> -	# stop daemon
> -	perf daemon stop --config ${config}
> -
> -	# ... and wait for the pid to go away
> -	tail --pid=${pid} -f /dev/null
> -}
> -
>  test_list()
>  {
>  	echo "test daemon list"
> -- 
> 2.30.1.766.gb4fecdf3b7-goog
>