linux-kernel - Re: [PATCH -tip v3 01/11] [BUGFIX] perf-probe: Fix to do exit call for symbol maps

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Date:	Mon, 17 Feb 2014 20:44:03 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"David A. Long" <dave.long@...aro.org>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH -tip v3 01/11] [BUGFIX] perf-probe: Fix to do exit call
 for symbol maps

(2014/02/17 16:56), Namhyung Kim wrote:
> Hi Masami,
> 
> On Thu, 06 Feb 2014 05:32:04 +0000, Masami Hiramatsu wrote:
>> Some perf-probe commands do symbol_init() but doesn't
>> do exit call. This fixes that to call symbol_exit()
>> and releases machine if needed.
>> This also merges init_vmlinux() and init_user_exec()
>> because both of them are doing similar things.
>> (init_user_exec() just skips init vmlinux related
>>  symbol maps)
>>
>> Changes from v2:
>>  - Not to set symbol_conf.try_vmlinux_path in init_symbol_maps()
>>    (Thanks to Namhyung Kim!)
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> [SNIP]
>> -int show_line_range(struct line_range *lr, const char *module)
>> +static int __show_line_range(struct line_range *lr, const char *module)
>>  {
>>  	int l = 1;
>>  	struct line_node *ln;
>> @@ -573,10 +568,6 @@ int show_line_range(struct line_range *lr, const char *module)
>>  	char *tmp;
>>  
>>  	/* Search a line range */
>> -	ret = init_vmlinux();
>> -	if (ret < 0)
>> -		return ret;
>> -
>>  	dinfo = open_debuginfo(module);
>>  	if (!dinfo) {
>>  		pr_warning("Failed to open debuginfo file.\n");
>> @@ -646,6 +637,19 @@ end:
>>  	return ret;
>>  }
>>  
>> +int show_line_range(struct line_range *lr, const char *module)
>> +{
>> +	int ret;
>> +
>> +	ret = init_symbol_maps(false);
>> +	if (ret < 0)
>> +		return ret;
>> +	ret = __show_line_range(lr, module);
>> +	exit_symbol_maps();
> 
> Wouldn't it be better moving init/exit_symbol_maps() to a common
> location if they're used by every operations?

Oh, that's a good idea.:)
Since this just introduces init/exit_symbol_maps() to fix issue
by replacing old one. I think it's better to be done after this series.

Thank you,



-- 
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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