linux-kernel - Re: [PATCH 2/2] perf probe: Find compilation directory path for lazy matching

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Date:	Thu, 26 Feb 2015 17:08:29 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Naohiro Aota <naota@...sp.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf probe: Find compilation directory path for
 lazy matching

(2015/02/26 16:12), Naohiro Aota wrote:
> If we use lazy matching, it failed to open a souce file if perf command
> is invoked outside of compilation directory:
> 
> $ perf probe -a '__schedule;clear_*'
> Failed to open kernel/sched/core.c: No such file or directory
>   Error: Failed to add events. (-2)
> 
> OTOH, other commands like "probe -L" can solve the souce directory by
> themselves. Let's make it possible for lazy matching too!
> 
> Signed-off-by: Naohiro Aota <naota@...sp.net>
> ---
>  tools/perf/util/probe-finder.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index b5247d7..8e0714c 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -39,6 +39,7 @@
>  #include "util.h"
>  #include "symbol.h"
>  #include "probe-finder.h"
> +#include "probe-event.h"
>  
>  /* Kprobe tracer basic type is up to u64 */
>  #define MAX_BASIC_TYPE_BITS	64
> @@ -849,11 +850,23 @@ static int probe_point_lazy_walker(const char *fname, int lineno,
>  static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
>  {
>  	int ret = 0;
> +	char *fpath;
>  
>  	if (intlist__empty(pf->lcache)) {
> +		const char *comp_dir;
> +
> +		comp_dir = cu_get_comp_dir(&pf->cu_die);
> +		ret = get_real_path(pf->fname, comp_dir, &fpath);
> +		if (ret < 0) {
> +			free(fpath);

Here, if the get_real_path is failed, fpath should be freed before returning.
If not, there is a bug, and yeah, there is a bug...

Thank you!

> +			pr_warning("Failed to find source file path.\n");
> +			return ret;
> +		}
> +
>  		/* Matching lazy line pattern */
> -		ret = find_lazy_match_lines(pf->lcache, pf->fname,
> +		ret = find_lazy_match_lines(pf->lcache, fpath,
>  					    pf->pev->point.lazy_line);
> +		free(fpath);
>  		if (ret <= 0)
>  			return ret;
>  	}
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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