linux-kernel - Re: [PATCH 09/19] perf ftrace: Add 'record' sub-command

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Date:	Wed, 10 Jul 2013 16:28:21 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 09/19] perf ftrace: Add 'record' sub-command

On Wed, Jun 26, 2013 at 04:14:12PM +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@....com>

SNIP

> +
> +static int create_perf_directory(struct perf_ftrace *ftrace)
> +{
> +	int err;
> +	char buf[PATH_MAX];
> +	struct stat statbuf;
> +
> +	scnprintf(buf, sizeof(buf), "%s.dir", ftrace->dirname);
> +
> +	if (stat(buf, &statbuf) == 0) {
> +		/* same name already exists - rename to *.old.dir */
> +		char *old_name = malloc(strlen(buf) + 5);
> +		if (old_name == NULL)
> +			return -1;
> +
> +		scnprintf(old_name, strlen(buf) + 5,
> +			  "%s.old.dir", ftrace->dirname);
> +
> +		if (remove_directory(old_name) < 0) {
> +			perror("rmdir");
> +			return -1;
> +		}
> +
> +		if (rename(buf, old_name) < 0) {
> +			perror("rename");
> +			free(old_name);
> +			return -1;
> +		}
> +
> +		free(old_name);
> +	}
> +
> +	err = mkdir(buf, 0755);
> +	if (err < 0) {
> +		perror("mkdir");
> +		return -1;
> +	}
> +
> +	strcat(buf, "/perf.header");
> +
> +	err = open(buf, O_RDWR | O_CREAT | O_TRUNC, 0644);
> +	return err;
> +}

nitpick.. should this be rather be called create_perf_header,
which calls create_perf_directory inside?

jirka
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