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Date:	Mon, 23 Dec 2013 06:35:09 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"David A. Long" <dave.long@...aro.org>, systemtap@...rceware.org,
	yrl.pp-manager.tt@...achi.com, Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH -tip 1/3] [CLEANUP] perf-probe: Expand given path to absolute
 path

(2013/12/21 3:00), Arnaldo Carvalho de Melo wrote:
> Em Fri, Dec 20, 2013 at 10:02:57AM +0000, Masami Hiramatsu escreveu:
>> Expand given path to absolute path in option parser,
>> except for a module name. Instead of expanding it later,
>> this get the absolute path in early stage.
> 
> What is the problem this solves?
> 
> Can you provide some output showing the problem, i.e. before you apply
> this patch?

No, this is just a code cleanup, for the later enhancements.
Should I put it into the next patch?

Thank you,

> 
> Then can you provide the output after the patch is applied?
> 
> - Arnaldo
>  
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>> ---
>>  tools/perf/builtin-probe.c    |    9 +++++++++
>>  tools/perf/util/probe-event.c |   11 ++---------
>>  2 files changed, 11 insertions(+), 9 deletions(-)
>>
>> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
>> index 6ea9e85..b40d064 100644
>> --- a/tools/perf/builtin-probe.c
>> +++ b/tools/perf/builtin-probe.c
>> @@ -180,6 +180,15 @@ static int opt_set_target(const struct option *opt, const char *str,
>>  		else
>>  			return ret;
>>  
>> +		/* Expand given path to absolute path, except for modulename */
>> +		if (params.uprobes || strchr(str, '/')) {
>> +			str = realpath(str, NULL);
>> +			if (!str) {
>> +				pr_warning("Failed to find the path of %s.\n",
>> +					   str);
>> +				return ret;
>> +			}
>> +		}
>>  		params.target = str;
>>  		ret = 0;
>>  	}
>> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
>> index d7cff57..05be5de 100644
>> --- a/tools/perf/util/probe-event.c
>> +++ b/tools/perf/util/probe-event.c
>> @@ -2281,7 +2281,7 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
>>  	struct perf_probe_point *pp = &pev->point;
>>  	struct symbol *sym;
>>  	struct map *map = NULL;
>> -	char *function = NULL, *name = NULL;
>> +	char *function = NULL;
>>  	int ret = -EINVAL;
>>  	unsigned long long vaddr = 0;
>>  
>> @@ -2297,12 +2297,7 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec)
>>  		goto out;
>>  	}
>>  
>> -	name = realpath(exec, NULL);
>> -	if (!name) {
>> -		pr_warning("Cannot find realpath for %s.\n", exec);
>> -		goto out;
>> -	}
>> -	map = dso__new_map(name);
>> +	map = dso__new_map(exec);
>>  	if (!map) {
>>  		pr_warning("Cannot find appropriate DSO for %s.\n", exec);
>>  		goto out;
>> @@ -2367,7 +2362,5 @@ out:
>>  	}
>>  	if (function)
>>  		free(function);
>> -	if (name)
>> -		free(name);
>>  	return ret;
>>  }
>>
> 


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


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