linux-kernel - Re: [PATCH perf/core 1/4] [BUGFIX] perf probe: List probes in stdout

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Date:	Sat, 13 Jun 2015 10:14:50 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Naohiro Aota <naota@...sp.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, namhyung@...nel.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core  1/4] [BUGFIX] perf probe: List probes in stdout

On 2015/06/13 4:12, Arnaldo Carvalho de Melo wrote:
> Em Fri, Jun 12, 2015 at 02:08:13PM +0900, Masami Hiramatsu escreveu:
>> Since commit 5e17b28f1e24 ("perf probe: Add --quiet option to
>> suppress output result message") have replaced printf with pr_info,
>> perf probe -l outputs its result in stderr. However, that is not
>> what the commit expected.
>> e.g.
>>   -----
>>   # perf probe -l > /dev/null
>>     probe:vfs_read       (on vfs_read@...c/linux-3/fs/read_write.c)
>>   -----
>> With this fix,
>>   -----
>>   # perf probe -l > list
>>   # cat list
>>     probe:vfs_read       (on vfs_read@...c/linux-3/fs/read_write.c)
> 
> Nope, with this fix just applied:

Oops, I missed to rewrite...

[...]
>> @@ -2200,9 +2220,10 @@ static int __show_perf_probe_events(int fd, bool is_kprobe,
>>  				goto next;
>>  			ret = convert_to_perf_probe_event(&tev, &pev,
>>  								is_kprobe);
>> -			if (ret >= 0)
>> -				ret = show_perf_probe_event(&pev,
>> -							    tev.point.module);
>> +			if (ret < 0)
>> +				goto next;
>> +			ret = show_perf_probe_event(&pev, tev.point.module,
>> +						    false);
>>  		}
>>  next:
>>  		clear_perf_probe_event(&pev);
>> @@ -2463,7 +2484,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
>>  		group = pev->group;
>>  		pev->event = tev->event;
>>  		pev->group = tev->group;
>> -		show_perf_probe_event(pev, tev->point.module);
>> +		show_perf_probe_event(pev, tev->point.module, true);
>>  		/* Trick here - restore current event/group */
>>  		pev->event = (char *)event;
>>  		pev->group = (char *)group;
>>
> 

These true/false are opposite!


-- 
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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