linux-kernel - Re: [PATCH] perf tool: save cmdline from user in file header vs what is passed to record

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Date:	Fri, 6 Jul 2012 14:17:35 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.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

Em Thu, Jul 05, 2012 at 10:09:22PM -0600, David Ahern escreveu:
> 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.

Can you please state for what branch, perf/urgent (i.e. current merge
window) or perf/core (next), this is intended? I usually have been
making the call, but having feedback from the submitter can help things
and help meet expectations more frequently.

I'd say this one should be for perf/core, as it is not so critical, what
do you think?

- Arnaldo
 
> 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
> 
> v2: simplified to saving the command in parse_options per Stephane's suggestion
> 
> 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-record.c     |    2 --
>  tools/perf/util/header.c        |    9 +++++++++
>  tools/perf/util/parse-options.c |    3 +++
>  3 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index f5a6452..77adcd8 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -844,8 +844,6 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
>  	struct perf_record *rec = &record;
>  	char errbuf[BUFSIZ];
>  
> -	perf_header__set_cmdline(argc, argv);
> -
>  	evsel_list = perf_evlist__new(NULL, NULL);
>  	if (evsel_list == NULL)
>  		return -ENOMEM;
> 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 */
> diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
> index 99d02aa..594f8fa 100644
> --- a/tools/perf/util/parse-options.c
> +++ b/tools/perf/util/parse-options.c
> @@ -1,6 +1,7 @@
>  #include "util.h"
>  #include "parse-options.h"
>  #include "cache.h"
> +#include "header.h"
>  
>  #define OPT_SHORT 1
>  #define OPT_UNSET 2
> @@ -413,6 +414,8 @@ int parse_options(int argc, const char **argv, const struct option *options,
>  {
>  	struct parse_opt_ctx_t ctx;
>  
> +	perf_header__set_cmdline(argc, argv);
> +
>  	parse_options_start(&ctx, argc, argv, flags);
>  	switch (parse_options_step(&ctx, options, usagestr)) {
>  	case PARSE_OPT_HELP:
> -- 
> 1.7.10.1
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