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Date: Thu, 5 Jul 2012 17:48:37 +0200
From: Stephane Eranian <eranian@...gle.com>
To: David Ahern <dsahern@...il.com>
Cc: linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] perf tool: save cmdline from user in file header vs what
is passed to record
On Tue, Jul 3, 2012 at 6:08 AM, David Ahern <dsahern@...il.com> wrote:
> A number of builtin commands process some user args and then pass the rest
> to cmd_record. cmd_record then saves argc/argv that it receives into the
> header of the perf data file. But this loses the arguments handled by the
> first command -- ie., the real command line from the user. This patch saves
> the command line as typed by the user rather than what was passed to
> cmd_record.
>
> As an example consider the command:
> $ perf kvm --guest --host --guestmount=/tmp/guest-mount record
> -fo /tmp/perf.data -ag -- sleep 10
>
> Currently the command saved to the header is:
> cmdline : /tmp/p3.5/perf record -o perf.data.kvm -fo /tmp/perf.data -ag -- sleep 1
>
> (ignore the duplicated -o -- the first would be yet another bug with perf-kvm).
>
> With this patch the command line saved to the header is:
> cmdline : /tmp/p3.5/perf kvm --guest --host --guestmount=/tmp/guest-mount
> record -fo /tmp/perf.data -ag -- sleep 1
>
Yes, you need to manually add the pfm_header__set_cmdline(). That begs
the question
as to whether or not it would not be better to move this call directly into
the parse_option() function given that it must be done BEFORE parsing actually
takes place.That way we would be sure all present and future commands would
be covered.
> Signed-off-by: David Ahern <dsahern@...il.com>
> CC: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...il.com>
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> ---
> tools/perf/builtin-kmem.c | 2 ++
> tools/perf/builtin-kvm.c | 2 ++
> tools/perf/builtin-lock.c | 2 ++
> tools/perf/builtin-sched.c | 2 ++
> tools/perf/builtin-script.c | 2 ++
> tools/perf/builtin-timechart.c | 2 ++
> tools/perf/util/header.c | 9 +++++++++
> 7 files changed, 21 insertions(+)
>
> diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
> index ce35015..08c8f74 100644
> --- a/tools/perf/builtin-kmem.c
> +++ b/tools/perf/builtin-kmem.c
> @@ -770,6 +770,8 @@ static int __cmd_record(int argc, const char **argv)
>
> int cmd_kmem(int argc, const char **argv, const char *prefix __used)
> {
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, kmem_options, kmem_usage, 0);
>
> if (!argc)
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 9fc6e0f..913d0a8 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -107,6 +107,8 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __used)
> perf_host = 0;
> perf_guest = 1;
>
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, kvm_options, kvm_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
> if (!argc)
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index b3c4285..89917e1 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -980,6 +980,8 @@ int cmd_lock(int argc, const char **argv, const char *prefix __used)
> for (i = 0; i < LOCKHASH_SIZE; i++)
> INIT_LIST_HEAD(lockhash_table + i);
>
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, lock_options, lock_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
> if (!argc)
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 7a9ad2b..25113b2 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -1899,6 +1899,8 @@ static int __cmd_record(int argc, const char **argv)
>
> int cmd_sched(int argc, const char **argv, const char *prefix __used)
> {
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, sched_options, sched_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
> if (!argc)
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 1e60ab7..07bc60b 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1206,6 +1206,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
>
> setup_scripting();
>
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, options, script_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
>
> diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
> index 3b75b2e..1e776a6 100644
> --- a/tools/perf/builtin-timechart.c
> +++ b/tools/perf/builtin-timechart.c
> @@ -1108,6 +1108,8 @@ static const struct option options[] = {
>
> int cmd_timechart(int argc, const char **argv, const char *prefix __used)
> {
> + perf_header__set_cmdline(argc, argv);
> +
> argc = parse_options(argc, argv, options, timechart_usage,
> PARSE_OPT_STOP_AT_NON_OPTION);
>
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 5a47aba..99e410c 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -174,6 +174,15 @@ perf_header__set_cmdline(int argc, const char **argv)
> {
> int i;
>
> + /*
> + * If header_argv has already been set, do not override it.
> + * This allows a command to set the cmdline, parse args and
> + * then call another builtin function that implements a
> + * command -- e.g, cmd_kvm calling cmd_record.
> + */
> + if (header_argv)
> + return 0;
> +
> header_argc = (u32)argc;
>
> /* do not include NULL termination */
> --
> 1.7.10.1
>
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