linux-kernel - Re: [PATCH 2/3] perf probe: Make --source avaiable when probe with lazy

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Message-ID: <552BE38F.6000203@hitachi.com>
Date:	Tue, 14 Apr 2015 00:41:03 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	He Kuang <hekuang@...wei.com>
CC:	acme@...nel.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	namhyung@...nel.org, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] perf probe: Make --source avaiable when probe with
 lazy_line

Hi,

This one should already be fixed with Naohiro's patch.

 https://lkml.org/lkml/2015/3/13/16

Arnaldo, I've already given my ack for that.

https://lkml.org/lkml/2015/3/13/298

Should I resend that?


Thank you,

(2015/04/13 20:41), He Kuang wrote:
> Use get_real_path() to enable --source option when probe with lazy_line
> pattern.
> 
> Before this patch:
> 
>   $ perf probe -s ./kernel_src/ -k ./vmlinux --add='fs/super.c;s->s_count=1;'
>   Failed to open fs/super.c: No such file or directory
>     Error: Failed to add events.
> 
> After this patch:
> 
>   $ perf probe -s ./kernel_src/ -k ./vmlinux  --add='fs/super.c;s->s_count=1;'
>   Added new events:
>     probe:_stext         (on @fs/super.c)
>     probe:_stext_1       (on @fs/super.c)
>   ...
> 
> Signed-off-by: He Kuang <hekuang@...wei.com>
> ---
>  tools/perf/util/probe-event.c  |  2 +-
>  tools/perf/util/probe-event.h  |  2 ++
>  tools/perf/util/probe-finder.c | 18 +++++++++++++++---
>  3 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 5483d98..35ee51a 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -661,7 +661,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
>   * a newly allocated path on success.
>   * Return 0 if file was found and readable, -errno otherwise.
>   */
> -static int get_real_path(const char *raw_path, const char *comp_dir,
> +int get_real_path(const char *raw_path, const char *comp_dir,
>  			 char **new_path)
>  {
>  	const char *prefix = symbol_conf.source_prefix;
> diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
> index d6b7834..21809ea 100644
> --- a/tools/perf/util/probe-event.h
> +++ b/tools/perf/util/probe-event.h
> @@ -135,6 +135,8 @@ extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
>  			       struct strfilter *filter, bool externs);
>  extern int show_available_funcs(const char *module, struct strfilter *filter,
>  				bool user);
> +extern int get_real_path(const char *raw_path, const char *comp_dir,
> +			char **new_path);
>  
>  /* Maximum index number of event-name postfix */
>  #define MAX_EVENT_INDEX	1024
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 7831e2d..431c12d 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -791,11 +791,20 @@ static int find_lazy_match_lines(struct intlist *list,
>  	ssize_t len;
>  	int count = 0, linenum = 1;
>  	char sbuf[STRERR_BUFSIZE];
> +	char *realname = NULL;
> +	int ret;
>  
> -	fp = fopen(fname, "r");
> +	ret = get_real_path(fname, NULL, &realname);
> +	if (ret < 0) {
> +		pr_warning("Failed to find source file %s.\n", fname);
> +		return ret;
> +	}
> +
> +	fp = fopen(realname, "r");
>  	if (!fp) {
> -		pr_warning("Failed to open %s: %s\n", fname,
> +		pr_warning("Failed to open %s: %s\n", realname,
>  			   strerror_r(errno, sbuf, sizeof(sbuf)));
> +		free(realname);
>  		return -errno;
>  	}
>  
> @@ -817,7 +826,10 @@ static int find_lazy_match_lines(struct intlist *list,
>  	fclose(fp);
>  
>  	if (count == 0)
> -		pr_debug("No matched lines found in %s.\n", fname);
> +		pr_debug("No matched lines found in %s.\n", realname);
> +
> +	free(realname);
> +
>  	return count;
>  }
>  
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com


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