linux-kernel - Re: [PATCH 11/47] perf tools: Use argv style storage for cmdline feature data

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Date:	Tue, 21 Jul 2015 14:29:23 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 11/47] perf tools: Use argv style storage for cmdline
 feature data

Em Tue, Jul 21, 2015 at 02:31:31PM +0200, Jiri Olsa escreveu:
> We will reuse argv style data in following change to display
> counters header showing monitored command line.

Applied
 
> Link: http://lkml.kernel.org/n/tip-qu64zmm5zbpbkuybusnkg4gl@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/header.c  | 35 ++++++++++++++++++++---------------
>  tools/perf/util/header.h  |  1 +
>  tools/perf/util/session.c |  1 +
>  3 files changed, 22 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 03ace57a800c..179b2bdd157d 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -923,17 +923,13 @@ static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
>  			  FILE *fp)
>  {
>  	int nr, i;
> -	char *str;
>  
>  	nr = ph->env.nr_cmdline;
> -	str = ph->env.cmdline;
>  
>  	fprintf(fp, "# cmdline : ");
>  
> -	for (i = 0; i < nr; i++) {
> -		fprintf(fp, "%s ", str);
> -		str += strlen(str) + 1;
> -	}
> +	for (i = 0; i < nr; i++)
> +		fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
>  	fputc('\n', fp);
>  }
>  
> @@ -1541,14 +1537,13 @@ process_event_desc(struct perf_file_section *section __maybe_unused,
>  	return 0;
>  }
>  
> -static int process_cmdline(struct perf_file_section *section __maybe_unused,
> +static int process_cmdline(struct perf_file_section *section,
>  			   struct perf_header *ph, int fd,
>  			   void *data __maybe_unused)
>  {
>  	ssize_t ret;
> -	char *str;
> -	u32 nr, i;
> -	struct strbuf sb;
> +	char *str, *cmdline = NULL, **argv = NULL;
> +	u32 nr, i, len = 0;
>  
>  	ret = readn(fd, &nr, sizeof(nr));
>  	if (ret != sizeof(nr))
> @@ -1558,22 +1553,32 @@ static int process_cmdline(struct perf_file_section *section __maybe_unused,
>  		nr = bswap_32(nr);
>  
>  	ph->env.nr_cmdline = nr;
> -	strbuf_init(&sb, 128);
> +
> +	cmdline = zalloc(section->size + nr + 1);
> +	if (!cmdline)
> +		return -1;
> +
> +	argv = zalloc(sizeof(char *) * (nr + 1));
> +	if (!argv)
> +		goto error;
>  
>  	for (i = 0; i < nr; i++) {
>  		str = do_read_string(fd, ph);
>  		if (!str)
>  			goto error;
>  
> -		/* include a NULL character at the end */
> -		strbuf_add(&sb, str, strlen(str) + 1);
> +		argv[i] = cmdline + len;
> +		memcpy(argv[i], str, strlen(str) + 1);
> +		len += strlen(str) + 1;
>  		free(str);
>  	}
> -	ph->env.cmdline = strbuf_detach(&sb, NULL);
> +	ph->env.cmdline = cmdline;
> +	ph->env.cmdline_argv = (const char **) argv;
>  	return 0;
>  
>  error:
> -	strbuf_release(&sb);
> +	free(argv);
> +	free(cmdline);
>  	return -1;
>  }
>  
> diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
> index d4d57962c591..9b53b6525ce8 100644
> --- a/tools/perf/util/header.h
> +++ b/tools/perf/util/header.h
> @@ -84,6 +84,7 @@ struct perf_session_env {
>  	int			nr_pmu_mappings;
>  	int			nr_groups;
>  	char			*cmdline;
> +	const char		**cmdline_argv;
>  	char			*sibling_cores;
>  	char			*sibling_threads;
>  	char			*numa_nodes;
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index ed9dc2555ec7..fb1d525ca3d0 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -180,6 +180,7 @@ static void perf_session_env__delete(struct perf_session_env *env)
>  	zfree(&env->cpuid);
>  
>  	zfree(&env->cmdline);
> +	zfree(&env->cmdline_argv);
>  	zfree(&env->sibling_cores);
>  	zfree(&env->sibling_threads);
>  	zfree(&env->numa_nodes);
> -- 
> 2.4.3
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