linux-kernel - Re: [PATCH 09/14] perf tools: Use kmod_path__parse in decompress

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Date:	Wed, 4 Mar 2015 10:42:21 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 09/14] perf tools: Use kmod_path__parse in
 decompress_kmodule

Hi Jiri,

On Tue, Mar 03, 2015 at 04:29:36PM +0100, Jiri Olsa wrote:
> Replacing the file name parsing with kmod_path__parse.
> 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/util/symbol-elf.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index ada16762fac2..8dd530ce20c5 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -579,32 +579,41 @@ static int dso__swap_init(struct dso *dso, unsigned char eidata)
>  static int decompress_kmodule(struct dso *dso, const char *name,
>  			      enum dso_binary_type type)
>  {
> -	int fd;
> -	const char *ext = strrchr(name, '.');
> +	int fd = -1, try = 2;
>  	char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
> +	struct kmod_path m;
>  
>  	if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
>  	    type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
>  	    type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
>  		return -1;
>  
> -	if (!ext || !is_supported_compression(ext + 1)) {
> -		ext = strrchr(dso->name, '.');
> -		if (!ext || !is_supported_compression(ext + 1))
> -			return -1;
> +again:
> +	if (kmod_path__parse_ext(&m, name))
> +		return -1;
> +
> +	if (!m.comp) {
> +		if (!--try)
> +			goto out;
> +
> +		free(m.ext);
> +		name = dso->name;
> +		goto again;
>  	}

Maybe we can do like this instead:

	if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
		name = dso->name;

	if (kmod_path__parse_ext(&m, name))
		return -1;

Thanks,
Namhyung


>  
>  	fd = mkstemp(tmpbuf);
>  	if (fd < 0)
> -		return -1;
> +		goto out;
>  
> -	if (!decompress_to_file(ext + 1, name, fd)) {
> +	if (!decompress_to_file(m.ext, name, fd)) {
>  		close(fd);
>  		fd = -1;
>  	}
>  
>  	unlink(tmpbuf);
>  
> +out:
> +	free(m.ext);
>  	return fd;
>  }
>  
> -- 
> 1.9.3
> 
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