linux-kernel - Re: [PATCH] perf record: handle death by SIGTERM

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Message-ID: <5187FA43.80304@gmail.com>
Date:	Mon, 06 May 2013 12:45:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	acme@...stprotocols.net
CC:	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf record: handle death by SIGTERM

On 5/6/13 12:24 PM, David Ahern wrote:
> perf data files cannot be processed until the header file is update

yuk, that is supposed to say "until the header is updated"

David

> which is done via an on_exit handler. If perf is killed due to a SIGTERM
> it does not run the on_exit hooks leaving the perf.data file in a
> random state which perf-report will happily spin on trying to read. As
> noted by Mike an easy reproducer is:
>    perf record -a -g & sleep 1; killall perf
>
> Fix by catching SIGTERM like it does SIGINT.  Also need to remove the
> kill which was added via commit f7b7c26e.
>
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Mike Galbraith <efault@....de>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> ---
>   tools/perf/builtin-record.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index cdf58ec..fff985c 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -198,7 +198,6 @@ static void perf_record__sig_exit(int exit_status __maybe_unused, void *arg)
>   		return;
>
>   	signal(signr, SIG_DFL);
> -	kill(getpid(), signr);
>   }
>
>   static bool perf_evlist__equal(struct perf_evlist *evlist,
> @@ -404,6 +403,7 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
>   	signal(SIGCHLD, sig_handler);
>   	signal(SIGINT, sig_handler);
>   	signal(SIGUSR1, sig_handler);
> +	signal(SIGTERM, sig_handler);
>
>   	if (!output_name) {
>   		if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
>

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